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Universal surface microstructuring of transparent materials via coating-enabled nanosecond laser fabrication 认领 引用
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作者 Meiqi Liu Haojie Zhu +7 位作者 Ze Chen Xin Liu Yachao Zhang Chao Chen Chenchu Zhang Zhaoxin Lao Sizhu Wu Haojie Xia 《Chinese Optics Letters》 SCIE EI CAS CSCD 2026年第5期123-127,共5页
Highly transparent materials(e.g.,glass,PMMA,and PDMS)are widely used in optics,electronics,and biomedicine.However,surface microstructuring of transparent materials remains challenging for nanosecond lasers due to lo... Highly transparent materials(e.g.,glass,PMMA,and PDMS)are widely used in optics,electronics,and biomedicine.However,surface microstructuring of transparent materials remains challenging for nanosecond lasers due to low light absorption.We introduce a coating-assisted strategy that confines>90%of laser energy at the surface,enabling precise fabrication of microstructures.This method proves universally applicable across various transparent substrates.Post-processing easily removes the coating,leaving a clean surface.Our approach offers a flexible and cost-effective solution for microano processing of transparent materials,broadening the application scope of nanosecond lasers in optics and electronics. 展开更多
关键词 transparent material surface microstructuring coating-assisted microfabrication nanosecond laser
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Linking evolution of heterogeneous microstructure and rheology of granite to 1000℃ 认领 引用 被引量：4
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作者 Liyuan Liu Shengwen Luo +4 位作者 Derek Elsworth Kai Liu Yifan Luo Hongguang Ji Tao Wang 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第3期1842-1857,共16页
The study of the effects of thermal damage on the mineral components,microstructure,and macroscopic physico-mechanical properties of rocks can provide valuable references for rock engineering design and long-term safe... The study of the effects of thermal damage on the mineral components,microstructure,and macroscopic physico-mechanical properties of rocks can provide valuable references for rock engineering design and long-term safety evaluations.In this work,we systematically study the evolution of microstructure and variations in the mechanical properties of granite under high-temperature conditions.The microstructural changes and macro-mechanical properties of rocks are investigated across a temperature range of 25℃–1000℃ through the application of characterization techniques,macro-mechanical experiments,and numerical simulations.High temperatures induce the gradual evolution of micropores and mesopores into macropores,culminating in a significant increase in porosity,with the most rapid rate of increase occurring at 400℃.The X-ray diffraction(XRD)results indicate that the high-temperature environment(below 1000℃)specifically affects the intensity of the maximum diffraction peaks and the half-height width(FWHM)of each mineral component in the granite.The scanning electron microscope(SEM)observation confirms the development of fracture and the reduction in cementation between mineral particles under different temperatures.Additionally,uniaxial and triaxial compression tests were conducted using the GCTS mechanical loading system.Experimental results reveal that the threshold temperature for granite damage is 400℃,and the temperature range for the brittle-ductile transition of granite lies roughly between 600℃ and 800℃.Numerical simulations were performed by employing non-homogeneous rock damage theory and a thermal-mechanical-damage coupling model.Simulated results align well with experimental data.Specifically,the simulations demonstrate that high-temperature treatment causes the redistribution of microstructure in granite,resulting in increased heterogeneity and a change in the failure morphology. 展开更多
关键词 High temperature treatment Thermal damage Microstructure evolution Thermal-mechanical-damage coupling Rock heterogeneity
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Effect of Ta addition on microstructure and mechanical properties of Ti46Al1.5Cr8Nb alloy 认领 引用 被引量：2
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作者 Jiang-shan Liang Liao Mi +4 位作者 Hong-ze Fang Xin Ding Xian-fei Ding Bao-hui Zhu Rui-run Chen 《China Foundry》 SCIE EI CAS CSCD 2026年第1期37-44,共8页
The microstructure of high Nb-TiAl alloys was optimized by the addition of a small amount of Ta elements to further improve their properties.A series of Ti46Al1.5Cr8Nb-xTa(x=0.2,0.4,0.6,0.8,1.0,at.%)alloys were prepar... The microstructure of high Nb-TiAl alloys was optimized by the addition of a small amount of Ta elements to further improve their properties.A series of Ti46Al1.5Cr8Nb-xTa(x=0.2,0.4,0.6,0.8,1.0,at.%)alloys were prepared by vacuum arc melting.The microstructure,mechanical properties,and related influencing mechanisms were systematically investigated.The results indicate that the solidification microstructure of the Ti46Al1.5Cr8Nb-xTa alloys comprises theγ-TiAl phase,α2-Ti3Al phase,and B2 phase.As the Ta content increases from 0.2 at.%to 1.0 at.%,the content ofα2phase and B2 phase increases,while theγphase content decreases.Among them,the B2 phase shows the most pronounced change,being significantly refined,with its content increasing from 12.49%to 21.91%.In addition,the average size of the lamellar colony decreases from 160.65 to 94.44μm.The addition of the Ta element shifts the solidification path toward lower aluminum concentrations,leading to changes in phase content.The tantalum-induced increase in the B2 phase and enhanced supercooling at the solidification front provide the basis for lamellar colony refinement.Compressive testing at room temperature reveals that the Ti46 Al1.5 Cr8 Nb0.4 Ta alloy exhibits optimal compressive properties,achieving a compressive strength of 2,434 MPa and a compressive strain of 33.1%.The improvement of its properties is attributed to a combination of lamellar colony refinement,solid solution strengthening resulting from the incorporation of Ta element,and a reduction in the c/a of theγphase. 展开更多
关键词 TiAl alloy Ta element microstructure mechanical properties lamellar colony
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Laser-optical-field-modulation fabricating large-aperture dual-band antireflection windows for MWIR and LWIR imaging 认领 引用 被引量：2
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作者 Yulong Ding Cong Wang +8 位作者 Xianshi Jia Linpeng Liu Zheng Gao Xiang Jiang Shiyu Wang Dejin Yan Nai Lin Zhou Li Ji’an Duan 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第2期560-574,共15页
Dual-band antireflection(DBAR)windows based on surface microstructures offer a promising solution for mid-wave infrared(MWIR)and long-wave infrared(LWIR)co-aperture composite imaging.However,micro-nano manufacturing t... Dual-band antireflection(DBAR)windows based on surface microstructures offer a promising solution for mid-wave infrared(MWIR)and long-wave infrared(LWIR)co-aperture composite imaging.However,micro-nano manufacturing technology faces significant challenges in efficiently producing highly uniform microstructures with characteristic dimensions of∼1μm across hundreds of millimeters.Here,we report a laser optical field modulation(LOFM)technology for the rapid manufacture of ultra-large-scale arrays of antireflection microholes(ARMHs)on large-aperture and non-perfectly planar windows.LOFM technology,which modulates laser pulses in both temporal and spatial domains,enhances ARMH aspect ratios from 0.1 to 0.8 without reducing manufacturing time,and maintains processing accuracy even with laser focus shifts,thereby addressing inconsistencies in large-area processing.As a proof of concept,approximately 7 billion ARMHs are fabricated on a 100-mm-diameter zinc sulfide(ZnS)window at a rate of 20000 holes per second using LOFM technology assisted by machine learning.The fabricated DBAR ZnS window exhibits ultra-broadband(3.5−14μm),high transmittance(91.1%),wide-angle transmission,wear-resistant,and self-cleaning,making it suitable for environments with multiple interference factors.Dual-band imaging applications demonstrate the significant advantages of DBAR windows in target recognition,multi-scenario robustness,and information acquisition. 展开更多
关键词 laser optical field modulation large-aperture window non-perfectly planar antireflection microstructure dual-band infrared imaging
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Recent advances in metal hybrid additive manufacturing:a comprehensive review 认领 引用 被引量：2
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作者 Yu Lu Qi Zhang +8 位作者 Yukai Chen Yin Wang Bingli Hua Peiyuan Zheng Yuxuan Jiang Ke Huang Bin Han Akihiko Chiba Yancheng Zhang 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第3期340-395,共56页
Metal additive manufacturing(AM)holds significant potential for the rapid prototyping of complex parts in the aerospace,defense,and military industries,biomedicine,and other fields.Despite its advantages over conventi... Metal additive manufacturing(AM)holds significant potential for the rapid prototyping of complex parts in the aerospace,defense,and military industries,biomedicine,and other fields.Despite its advantages over conventional manufacturing methods,AM faces technical bottlenecks(e.g.,poor densification,high residual stress,and significant anisotropy of mechanical properties),which hinder its large-scale industrial application.The newly emerging metal hybrid additive manufacturing(MHAM)serves as a viable approach to address the inherent issues associated with AM.This method integrates different auxiliary technologies(e.g.,subtractive manufacturing,formative manufacturing,magnetic fields,ultrasonic fields,thermal fields,etc.),leveraging the strengths of these technologies to enhance the performance of metal components produced via AM.MHAM offers numerous advantages,such as controlling the flow of the melt pool,refining the microstructure,optimizing the grain size orientation,reducing the residual stress,enhancing the surface quality,and improving the mechanical properties and fatigue resistance.This work offers a thorough and current analysis of the state of MHAM development,including additive and subtractive hybrid manufacturing,additive and formative hybrid manufacturing,and energy field-assisted additive manufacturing.It delineates the MHAM technology framework and clarifies the interaction mechanisms among various auxiliary technologies used in AM.Additionally,it discusses the impacts of MHAM on melt pool dynamics,solidification processes,densification,microstructure evolution,surface quality,and mechanical and fatigue properties.In summary,the distinct characteristics of various MHAM techniques are outlined,and future trends in MHAM development are anticipated. 展开更多
关键词 additive manufacturing metal hybrid additive manufacturing auxiliary energy fields microstructure evolution mechanical properties
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Characterizing soil shrinkage and soil-water retention behaviors of clayey soils with pore-size distribution and microstructure evolution 认领 引用 被引量：3
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作者 Sheng'ao Jia De'an Sun Pan Chen 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第5期3934-3948,共15页
The soil-water retention and soil shrinkage characteristics are both crucial constitutive relations for unsaturated soils.Although existing research has explored the correlation between these two characteristics to so... The soil-water retention and soil shrinkage characteristics are both crucial constitutive relations for unsaturated soils.Although existing research has explored the correlation between these two characteristics to some extent,the underlying mechanisms remain inadequately investigated.To investigate the correlation between the soil-water retention and soil shrinkage behavior,a series of soil-water retention and soil shrinkage tests is performed on compacted clays over a wide suction range(0–367 MPa).The test results show that the pore water in compacted clays is first expelled from large pores in low suction range.The drainage of pore water at low suctions is predominantly responsible for the phase of structural shrinkage in the soil shrinkage curve.The consistency between the characteristic transitional water contents in the soil shrinkage curve(SSC)and the inflection points in the soil-water retention curve(SWRC)is identified for all the compacted clays.The bimodal pore-size distributions(PSDs)of different clayey soils are obtained using the mercury intrusion porosimetry.The bimodal pore-size distribution characterization is the intrinsic factor in shaping the bimodal morphology in the SWRC over a wide suction range.The low proportion of micropores in clays is responsible to the indistinct zero-shrinkage stage of the SSC.The microstructure measured by the scanning electron microscope indicates the manifestation of aggregation effects during desaturation process.The results demonstrate that soil shrinkage is primarily caused by the contraction of inter-aggregate pores,rather than the evolution of intra-aggregate pores.The findings can greatly enhance the understanding of the soil-water retention and mechanical behavior of compacted clays in varying water content conditions. 展开更多
关键词 Clayey soil Soil shrinkage Soil-water retention Pore-size distribution Microstructure
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Statistical and experimental study of effects of process parameters on Ti-6Al-4V coaxial wire-feed laser cladding 认领 引用 被引量：2
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作者 Fan Liu Shaoshan Ji +2 位作者 Tuo Shi Shihong Shi Geyan Fu 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2026年第1期31-42,共12页
Three-beam wire-feed laser cladding,which generates a uniform energy distribution with a wire vertically fed into the molten pool,is a promising additive manufacturing technology.In this study,an experimental investig... Three-beam wire-feed laser cladding,which generates a uniform energy distribution with a wire vertically fed into the molten pool,is a promising additive manufacturing technology.In this study,an experimental investigation and a statistical analysis of Ti-6Al-4V wire cladding using three-beam laser coaxial wire-feed cladding technology coupled with a 2 kW continuous fiber laser were carried out.The influences of the main parameters,including the laser power,wire feeding speed,and laser scanning speed,on the cladding geometry and process were investigated.The prediction models correlating the process parameters and clad geometry were developed via the response surface methodology(RSM).The models were checked using analysis of variance(ANOVA).Through optimization,the optimal parameters were achieved for the required clad with a width-to-height ratio of 5:1.A high-speed camera was used to investigate the cladding process under various process parameters.The laser power positively affected the widths of the molten pool and cladding layer.The molten pool and clad heights decreased with increases in laser power and scanning speed.Fine acicular martensite grains in the colony and basket-weave distributions were predominant in the cross-section of the cladding layer.The macrostructure investigation showed that the widths of columnar prior-β grains decreased with the increase in laser scanning speed. 展开更多
关键词 Wire-feed laser cladding Geometry characteristics Ti-6Al-4V Cladding process Regression analysis Macrostructure and microstructure
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Natural weathering and plant regeneration accelerate soil restoration of fine particle mine tailings 认领 引用 被引量：1
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作者 Delong Meng Yu Liu +12 位作者 Xiaohui Huang Jing Wen Teng Zhang Huaqun Yin Ling Xia Wenyi Liu Jing Xiong Xing Li Zhenghua Liu Xiangdong Xiao Ibrahim Ahmed Ibrahim Xueduan Liu Min Zhang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第5期388-398,共11页
Tailings pedogenesis plays a fundamental role in the ecological restoration of mining wastelands by converting barren tailings into soil-like substrates through physical,chemical,and biological processes.To systematic... Tailings pedogenesis plays a fundamental role in the ecological restoration of mining wastelands by converting barren tailings into soil-like substrates through physical,chemical,and biological processes.To systematically investigate the contributions and interactions of natural weathering and plant regeneration in the tailings pedogenesis,this study analyzed the microstructure,chemical composition,and rhizosphere microbial communities of original tailings samples(OR),15-year naturally weathered samples(PW),and naturally regenerated samples spontaneously colonized by Miscanthus(PM),Lolium perenne(LP),and Cynodon dactylon(CD).X-ray micro-computed tomography revealed that natural weathering increased the total soil porosity of the tailings by 13.45%,with negligible effects on chemical properties.After natural regeneration,soil porosity further increased from 18.74%to 41.45%.Scanning Electron Microscope revealed microaggregates attaching to the root surfaces.In addition,plant species exhibited distinct influences on soil chemical properties.Specifically,PM significantly increased soil organic matter and nitrate nitrogen content,whereas CD primarily promoted the accumulation of rapidly available potassium.Compared to the OR,natural weathering initiated the reconstruction of microbial communities,which were further enriched by plant root systems during natural regeneration.Notably,PM enriched functional genera such as Haliangium and Bryobacter,which were positively associated with heavy metal stabilization,suggesting its role as a critical pioneer species for ecological restoration of tailings.This study highlights the distinct and synergistic roles of natural weathering and plant regeneration in tailings pedogenesis,offering insights for plant selection and ecological restoration strategies. 展开更多
关键词 Natural weathering Plant regeneration Tailings Microorganisms Soil microstructure
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Precipitation behavior of TiN and mechanical properties of ferritic stainless steel under coupling effect of Nb and Ti elements 认领 引用 被引量：1
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作者 Yang-Li Liu Yu Zhang +4 位作者 Hao Fu Shuo Dang Zhu Cao Muhammad-Abubaker Khan Jing-Yuan Li 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第3期145-158,共14页
To reveal the influence mechanism of Nb/Ti microalloying on the mechanical property of ferritic stainless steel,the grain size,phase composition,microhardness,mechanical properties and fracture morphology are characte... To reveal the influence mechanism of Nb/Ti microalloying on the mechanical property of ferritic stainless steel,the grain size,phase composition,microhardness,mechanical properties and fracture morphology are characterized and analyzed for ferritic stainless steel with single addition of Ti stabilizing element and composite addition of Nb and Ti stabilizing elements.The influence mechanism of Ti and Nb stabilizing elements is elucidated on microstructure and mechanical properties of ferritic stainless steel.Results indicate that the grains are bigger(20-60µm)for ferritic stainless steel containing 0.09 wt.%Ti(F-Ti-ss).The average grain size is about 43.9µm.Meanwhile,there are many granular TiN precipitates with big size.For ferritic stainless steel with Nb and Ti stabilizing elements(F-Nb-Ti-ss),the grains are small(8-22µm),and average grain size is about 17.3µm.There are a few granular TiN precipitates with small size.Furthermore,many nanoscale(Fe,Cr,Nb)C phases precipitate at grain boundary,which plays a role in refining grain size.Compared with mechanical properties of F-Ti-ss(506 MPa and 28.2%),both the ultimate tensile strength and elongation are improved for F-Nb-Ti-ss(573 MPa and 30.5%).The ultimate tensile strength is increased by 13.2%.The main reason is that grains are obviously refined and a large number of nanoscale phases precipitate at grain boundary for F-Nb-Ti-ss.Therefore,strengthening effect is obvious and grain deformation is more uniform during tensile test. 展开更多
关键词 Ferritic stainless steel Microalloying Microstructure Mechanical property Nanoscale precipitate
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Achieving Superior Mechanical Properties for Al-Zn-Mg-Cu Alloy by Coupling Design of Powder Press-Forming,Deformation,and Aging 认领 引用 被引量：1
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作者 Peng-Fei Ji Bo-Han Chen +2 位作者 Bo Li Hua-Guo Tang Zhu-Hui Qiao 《Rare Metals》 SCIE EI CAS CSCD 2026年第1期580-589,共10页
Enhancing the strength of 7000 series high-strength Al alloys remains a critical challenge to meet the demands of increasingly demanding service environments.In this study,a novel approach is proposed for developing h... Enhancing the strength of 7000 series high-strength Al alloys remains a critical challenge to meet the demands of increasingly demanding service environments.In this study,a novel approach is proposed for developing high-performance Al alloys through a combination of powder mechanical alloying,powder press-forming,rolling deformation,and aging treatment composite process.The resulting high-performance oxide-dispersion-strengthened(ODS) 7000 series Al alloy exhibits an ultrahigh yield strength of 785±12 MPa,an ultimate tensile strength of 805±7 MPa,and a moderate elongation to failure of 5.6%±0.5%,achieving an excellent balance between strength and ductility.The excellent mechanical properties of high-performance ODS Al alloys are attributed to the synergistic effect of multiple strengthening mechanisms.Detailed microstructural analyses were carried out to investigate the hierarchical microstructural features responsible for the enhanced mechanical performance,in which precipitation strengthening is identified as the dominant strengthening mechanism.These findings provide valuable insights for the design of advanced Al alloys intended for structural applications under demanding service conditions. 展开更多
关键词 aluminum alloys high strength mechanical property microstructure powder press-forming
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Feasibility of underground gas storage construction from large-scale low-permeability lithologic gas reservoirs:Insights into microscopic storage spaces 认领 引用 被引量：1
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作者 Zhen-Hua Tian Yong Xia +7 位作者 Jian-Guo Zhang De-Long Wang Zhi-Jun Liu Chen-Yang Zhao Yu-Xuan Xia Jun-Wei Su Deng-Ke Liu Jian-Chao Cai 《Petroleum Science》 SCIE EI CAS CSCD 2026年第3期1606-1623,共18页
The construction of underground gas storage(UGS)in a large-scale low-permeability lithologic gas reservoir presents an immense engineering challenge.Under the context of UGS,research on structural characteristics and ... The construction of underground gas storage(UGS)in a large-scale low-permeability lithologic gas reservoir presents an immense engineering challenge.Under the context of UGS,research on structural characteristics and storage capacity at the microscopic scale is insufficient,making it difficult to provide effective support for the engineering scheme.In this study,the microscopic storage spaces of a typical lithologic gas reservoir(i.e.,YL block in the Ordos Basin)are comprehensively analyzed through experimental techniques(represented by computed tomography scanning),digital core analysis,and fractal analysis.Furthermore,the feasibility of UGS construction is examined.The results demonstrate that the large-scale low-permeability lithologic gas reservoir exhibits significant zonal heterogeneity in its microscopic structural characteristics at both morphological and statistical levels.Specifically,the microscopic storage spaces of the core zone within the YL block are notably higher than those in the transition and periphery zones,characterized by larger aperture,less tortuous,higher aggregation and connectivity.Consequently,the core zone provides adequate storage capacity and injection-extraction capability for large-scale underground storage of natural gas.In contrast,the transition and periphery zones exhibit inferior microstructural,storage,and flow properties,which are not suitable for rapid injection and production.However,these zones show a fairly strong lateral sealing capability,which can be utilized as a monitoring area to evaluate UGS integrity.These findings indicate that the reservoir's microstructural features meet the essential requirements of storage capacity,injection-extraction capability,and lateral sealing property for UGS construction.Based on this understanding,a series of zone-differentiated UGS engineering suggestions are proposed,including zonal function specification,well type selection,well deployment scheme,and management of old wells.These findings can provide valuable insights for the assessment and implementation of UGS projects from such gas reservoirs. 展开更多
关键词 Underground gas storage Lithologic gas reservoir Microstructure Micro-CT Zonal discrepancy
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Effect of Argon Atmosphere Heat Treatment on Mechanical Properties and Microstructural Evolution of Shicolon-Ⅱ SiC Fibers 认领 引用 被引量：1
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作者 YUAN Wang HU Jianbao +3 位作者 ZHOU Liang KAN Yanmei ZHANG Xiangyu DONG Shaoming 《无机材料学报》 SCIE EI CAS CSCD 北大核心 2026年第1期119-128,共10页
Silicon carbide fibers are considered ideal reinforcing materials for ceramic matrix composites due to their excellent mechanical properties and high-temperature performance.Different types of fibers necessitate indiv... Silicon carbide fibers are considered ideal reinforcing materials for ceramic matrix composites due to their excellent mechanical properties and high-temperature performance.Different types of fibers necessitate individual investigation due to variations in their composition and fabrication processes.This study presents a comprehensive investigation into evolution of the mechanical properties,surface microstructure,and composition of Shicolon-Ⅱ fibers subjected to argon heat treatment at temperatures ranging from 1300℃to 1700℃.The Shicolon-Ⅱ fibers are composed of small-sized β-SiC grains,SiCxOy amorphous phase,and a minor amount of graphite microcrystals.Following treatment in an argon atmosphere at 1300℃,the fibers maintain a monofilament tensile strength of 3.620 GPa,corresponding to a retention of 98.32%.This strength diminishes to 2.875 GPa,equating to a retention of 78.08%,after treatment at 1500℃.The reduction in mechanical properties of the fibers can be ascribed to the decomposition of the amorphous phase and the growth of β-SiC grains.Furthermore,creep resistance is an essential factor influencing the long-term performance of composite materials.After treatment at temperatures above 1400℃,the high-temperature creep resistance of the fibers is significantly enhanced due to growth of β-SiC grains.This study offers valuable theoretical insights into high-temperature applications of second-generation fibers,contributing to an enhanced understanding of their performance under extreme conditions. 展开更多
关键词 Shicolon-ⅡSiC fiber heat treatment mechanical property microstructure
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Effect of Cu content on mechanical and intergranular corrosion properties of Al-Cu-Mg-Ag alloy 认领 引用 被引量：1
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作者 OUYANG Zuo-qiong MO Wen-feng +4 位作者 PAN Yu-zhe XIANG Zheng-wu WANG Shuai BAI Zhen-hai LUO Bing-hui 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第3期1050-1075,共26页
The differences in the microstructure,mechanical properties,and intergranular corrosion performance of three Al-Cu-Mg-Ag alloys with varying Cu content were analyzed.The results show that Cu content primarily affects ... The differences in the microstructure,mechanical properties,and intergranular corrosion performance of three Al-Cu-Mg-Ag alloys with varying Cu content were analyzed.The results show that Cu content primarily affects the precipitation of intragranular Ω and S′phases,as well as the type and distribution of grain boundary precipitates(GBPs).As the amount of Cu increases,the diameter and volume fraction of the Ω phase increase,while the proportion of the S′phase first increases and then decreases.The alloy with high Cu content exhibits higher strength,mainly due to a larger contribution from precipitate strengthening(mainly the Ω phase)and strengthening provided by additional Cu atoms.However,the lower number density of the Ω phase results in poor fatigue resistance.The GBPs transition from the intermittently distributed S phase to the continuously distributed S and θ phases,which is the main reason for the decrease of intergranular corrosion resistance in high Cu alloys and also has some impact on the fatigue resistance of the alloy.Electrochemical characteristics also show that high Cu alloys have higher free corrosion current density and corrosion rate,lower polarization resistance,and smaller charge transfer resistance of the double layer and inductance values. 展开更多
关键词 Al-Cu-Mg-Ag alloy Cu content microstructure evolution Ωphase
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Interfacial microstructure and properties of additively manufactured composite rollers after online service 认领 引用 被引量：1
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作者 Xin Di Hao-zheng Li +5 位作者 Ce Ji Peng-rui Li Shi-bin Liu Jin-feng Chen Wei-guo Han Hua-gui Huang 《China Foundry》 SCIE EI CAS CSCD 2026年第4期577-590,共14页
Composite rollers serve as critical components in modern slab continuous casting systems,particularly the No.0 segment rollers positioned at the mold exit,which endure severe service conditions and intermittent therma... Composite rollers serve as critical components in modern slab continuous casting systems,particularly the No.0 segment rollers positioned at the mold exit,which endure severe service conditions and intermittent thermal shocks.The service stability of these composite rollers directly determines the continuous operation capability of casting lines and per-ton steel cost control,making reliability enhancement a critical research topic in the field of metallurgical equipment.In this study,414N/42CrMo heterogeneous composite rollers with gradient properties were fabricated by additive manufacturing.The multi-scale characterization techniques were conducted on the composite rollers after online service for 2.5 months in a continuous casting line,including SEM,EBSD,and X-ray computed tomography for 3D defect mapping.The elemental interdiffusion kinetics,microstructure,and defect distribution were systematically elucidated.The directional migration of Cr/Mo elements enables the formation of a gradient interfacial architecture:heterogeneous interfacial thickness with alternating peak-valley morphology driven by differential elemental diffusion behaviors,progressive transitions in grain boundary configurations from low-angle to high-angle,and gradient variations in grain size distribution across adjacent microstructural zones.X-ray computed tomography reveals that the defect distribution across the entire interfacial region exhibits spatial heterogeneity,characterized by the presence of distinct defect clusters from the 414N cladding layer near the interface,accompanied by localized aggregations of irregular defects(with an equivalent diameter greater than 50μm).Therefore,a remanufacturing strategy is proposed to eliminate defect-rich interfacial layers and reconstruct gradient-compatible interfaces for performance resto ration,which offers practical solutions for extending service life through precision remanufacturing. 展开更多
关键词 composite rollers gradient material microstructure microscale defects additive manufacturing
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Microstructure optimization and magnetic properties of sintered Nd-Fe-B via modulation of boron and gallium contents 认领 引用 被引量：1
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作者 Jingyan Zuo Minggang Zhu +6 位作者 Dongmin Zhang Ziqi Deng Qisong Sun Yaping Wu Xiaolong Song Xian Wu Yikun Fang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第3期841-849,I0004,共9页
The optimization of microstructure represents a significant methodology for enhancing coercivity(Hcj).This paper concentrates on optimizing the microstructure of magnets through the manipulation of the composition of ... The optimization of microstructure represents a significant methodology for enhancing coercivity(Hcj).This paper concentrates on optimizing the microstructure of magnets through the manipulation of the composition of low-melting-point and high-melting-point elements,thereby achieving the objective of augmenting the comprehensive magnetic properties of magnets.The present study is concerned with the microstructure of magnets comprising three distinct Ga and B contents,and the associated changes in their magnetic properties.The findings indicate that when the Ga content is 0.5 wt%and the B content is 0.88 wt%,the coercivity of the magnets is markedly enhanced.This is evidenced by an increase in coercivity from 8.51 to 14.83 kOe,representing a 74.26%rise.Concurrently,the residual magnetization strength of the magnet remains unaltered.This finding provides a crucial foundation for optimizing the overall magnetic properties of the magnets.The microstructural analysis indicates that a reduction in B content coupled with an increase in Ga content leads to the melting of sharp angles on the surface of the main-phase grains,facilitated by low-melting-point rare-earth-rich phases.This process results in the migration of Fe from the grain boundaries(GBs)to the triple junction phases(TJPs),while Nd migrates from the TJPs to the GBs.This migration results in a reduction in the agglomeration of rare-earth-rich elements within the TJPs,thereby increasing the Nd content in the GBs.This increase enhances the wettability of the GBs,while the reduction of Fe content in this phase mitigates the exchange-coupling effect between the main-phase GBs.Consequently,the GBs become more smooth,more homogeneous and more continuous,which ultimately results in an enhancement of the coercivity of the magnets. 展开更多
关键词 Sintered Nd-Fe-B Coercivity Microstructure Rare earths Grain boundaries Triple junction phases
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Achieving serrated grain boundaries within gradient microstructures of nickel-based superalloys for dual-property turbine disks in aeroengines 认领 引用 被引量：1
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作者 Bingchao XIE Yongquan NING +4 位作者 Youwei LUO Zhaotian WANG Bowen SHI Mei ZHAN Mingwang FU 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2026年第2期641-660,共20页
Gradient microstructures strengthened by serrated Grain Boundaries(GBs)were achieved through a combination of Gradient Strain Deformation(GSD)and Serration Heat Treatment(SHT),with particular focus on microstructural ... Gradient microstructures strengthened by serrated Grain Boundaries(GBs)were achieved through a combination of Gradient Strain Deformation(GSD)and Serration Heat Treatment(SHT),with particular focus on microstructural evolution,underlying mechanisms,and the critical influencing factors.Dynamic recrystallization governed the microstructural evolution in the fine-grained and transition regions during GSD,where multiple nucleation mechanisms were active.Plastic deformation facilitated the dissolution ofγ'phase in fine-grained regions,ultimately resulting in its morphological transformation.During the subsequent SHT,serrated GBs formed within the gradient microstructures produced by prior GSD without disrupting the grain size gradient,thereby enhancing creep resistance.Two distinct mechanisms associated withγ'gbparticles governed the formation of the serrations at GBs.Owing to the stronger dragging effect of grain boundary junctions in fine-grained regions,the amplitude and wavelength of serrations in these regions were smaller than those in coarse-grained regions.Moreover,the formation of serrations exhibited a strong dependence on the inherent properties of the GBs.The random high-angle grain boundaries(HAGBs)with misorientation angles in the range of 30-59°tended to become serrated more easily during SHT due to their high mobility and the accelerated precipitation ofγ'gbparticles at them.Low-ΣHAGBs and low-angle GBs were not prone to form serrations.In particular,serration formation was completely inhibited atΣ3 twin boundaries due to their extremely low mobility and the absence ofγ'gbparticles. 展开更多
关键词 Gradient microstructures Grain boundary migration Grain boundary properties Serrated grain boundaries Serration formation mechanisms Superalloys
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3D forming space and abnormal lamellar microstructures in a Mg-10Gd-Zr alloy fabricated by laser powder bed fusion 认领 引用 被引量：1
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作者 Ziyi Liu Qingchen Deng +4 位作者 Ziyan Li Yiwen Ding Jing Luo Hong Liu Liming Peng 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第2期460-479,共20页
Mg-10Gd-Zr(G10K,wt.%)is a commonly used high-performance magnesium-rare earth alloy that has demonstrated good suitability for additive manufacturing processes.However,the formability and microstructures need to be fu... Mg-10Gd-Zr(G10K,wt.%)is a commonly used high-performance magnesium-rare earth alloy that has demonstrated good suitability for additive manufacturing processes.However,the formability and microstructures need to be further explored for its engineering application.This study presents a systematic and in-depth investigation of the defects,microstructural characteristics,and mechanical properties of G10K alloy fabricated by laser powder bed fusion(LPBF)as a function of processing parameters.A 3D forming space for LPBF-G10K alloy is constructed by adopting laser beam diameter as the third variant other than laser power and scanning speed.With a laser beam diameter of 120μm,the fluctuation of the melt pool is minimized,leading to the suppression of gas porosities and balling defects,and thus the expansion of forming zone of the alloy as compared to laser beam diameters of 100 or 140μm.LPBF-G10K alloy under the optimal processing parameter consists of a heterogeneous microstructure of coarse and fine grains.The formation of abnormal lamellar structures in the coarse grains at the middle of melt pools is attributed to the planar growth along laser scanning direction.The lamellar coarse grains provide strength in the alloy due to texture-strengthening effect,while plastic deformation is primarily accommodated by equiaxed grains.These findings are instrumental for application and future modification of the LPBF-G10K alloy. 展开更多
关键词 Laser powder bed fusion Mg-Gd alloy Laser beam diameter,defect Lamellar microstructure
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Real-time evaluation of molten-pool dynamic stability in laser-directed energy deposition based on interframe similarity monitoring 认领 引用 被引量：1
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作者 Hui Xiao Mingtao Wu +4 位作者 Yanqin Li Jinhai Wang Wenjia Xiao Kuanfang He Lijun Song 《Additive Manufacturing Frontiers》 CAS CSCD 2026年第2期132-143,共12页
The dynamic stability of the molten pool during laser-directed energy deposition(L-DED)critically affects the forming quality and material properties.However,existing monitoring methods primarily focus on the static g... The dynamic stability of the molten pool during laser-directed energy deposition(L-DED)critically affects the forming quality and material properties.However,existing monitoring methods primarily focus on the static geometric features of the molten pool,such as width,height,area,and geometric center,yet fail to capture its instantaneous morphological evolution.This work established a lightweight real-time monitoring framework that integrates YOLOv8n and the perceptual Hashing(PHash)algorithm to monitor the dynamic stability of the molten pool in l-DED online.Furthermore,the molten-pool interframe similarity(MPIFS)is developed as a novel metric to quantify dynamic stability.The experimental results show that the YOLOv8n-PHash framework achieves a processing speed of 85 FPS(3.15×faster than U-Net)and reduces computational latency to 10.87 ms/frame,which is 6×faster than the structural similarity(SSIM),satisfying industrial closed-loop control requirements.The MPIFS metric shows three times higher sensitivity to molten-pool fluctuations than the static geometric parameters,with a standard deviation of 2.8%for MPIFS versus 0.15%-0.98%for the width and height.This enhanced sensitivity significantly improves the anomaly detection capabilities.In addition,a strong correlation among the process,molten-pool stability,and microstructure was confirmed.An appropriately low laser power was shown to improve MPIFS stability,resulting in smooth interfaces and uniform fine grains.This work provides a novel approach for the online monitoring of molten-pool stability and microstructure prediction in L-DED additive manufacturing. 展开更多
关键词 Additive manufacturing Online monitoring Molten-pool stability Microstructure
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Coupled Effects of Single-Vacancy Defect Positions on the Mechanical Properties and Electronic Structure of Aluminum Crystals 认领 引用 被引量：1
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作者 Binchang Ma Xinhai Yu Gang Huang 《Computers, Materials & Continua》 SCIE EI 2026年第1期332-352,共21页
Vacancy defects,as fundamental disruptions in metallic lattices,play an important role in shaping the mechanical and electronic properties of aluminum crystals.However,the influence of vacancy position under coupled t... Vacancy defects,as fundamental disruptions in metallic lattices,play an important role in shaping the mechanical and electronic properties of aluminum crystals.However,the influence of vacancy position under coupled thermomechanical fields remains insufficiently understood.In this study,transmission and scanning electron microscopy were employed to observe dislocation structures and grain boundary heterogeneities in processed aluminum alloys,suggesting stress concentrations and microstructural inhomogeneities associated with vacancy accumulation.To complement these observations,first-principles calculations and molecular dynamics simulations were conducted for seven single-vacancy configurations in face-centered cubic aluminum.The stress response,total energy,density of states(DOS),and differential charge density were examined under varying compressive strain(ε=0–0.1)and temperature(0–600 K).The results indicate that face-centered vacancies tend to reduce mechanical strength and perturb electronic states near the Fermi level,whereas corner and edge vacancies appear to have weaker effects.Elevated temperatures may partially restore electronic uniformity through thermal excitation.Overall,these findings suggest that vacancy position exerts a critical but position-dependent influence on coupled structure-property relationships,offering theoretical insights and preliminary experimental support for defect-engineered aluminum alloy design. 展开更多
关键词 Aluminum crystal vacancy defect microstructural characterization stress response electronic structure thermomechanical coupling
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Microstructure and mechanical properties evolution of Al−Mg−Sc−Zr alloy fabricated by laser powder bed fusion 认领 引用 被引量：1
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作者 Xiang LI Zheng-jiang GAO Yun-zhong LIU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第2期337-354,共18页
The densification characterization,phase constitution,precipitation evolution and mechanical performance of Al−Mg−Sc−Zr alloy processed by laser powder bed fusion(LPBF)were systematically investigated.Moreover,the evo... The densification characterization,phase constitution,precipitation evolution and mechanical performance of Al−Mg−Sc−Zr alloy processed by laser powder bed fusion(LPBF)were systematically investigated.Moreover,the evolution of phase constitution and precipitation behavior after heat treatment were characterized by using X-ray diffraction(XRD)and transmission electron microscope(TEM)analysis.The ultimate tensile strength(UTS)of as-built samples ranged from 396.8 to 414.6 MPa as the scanning speed decreased from 1600 to 1000 mm/s.After post heat treatment,the yield strength(YS)increased to(513.1±1.3)MPa,while the UTS increased from(414.6±5.1)to(539.2±1.5)MPa.The significant improvement of mechanical performance was ascribed to the formation of secondary Al3(Sc,Zr)precipitates. 展开更多
关键词 additive manufacturing laser powder bed fusion Al−Mg−Sc−Zr precipitation behavior microstructure mechanical performance
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