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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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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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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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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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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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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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Microstructure and mechanical properties of shear spun Mg-5Zn-1Gd-1Y-1Mn alloy 认领 引用
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作者 Jing-Xiang Zhao Kun-Kun Deng +4 位作者 Yi-Jia Li Cui-Ju Wang Kai-Bo Nie Zhong-Sen Huang Yi-Ming Zhu 《Metals Advances》 SCIE EI CAS CSCD 2026年第4期92-106,共15页
Shear spinning is an important method for metal shell forming.However,due to the poor plasticity of magnesium alloy,limited research exists on its spinning forming.Understanding the microstructure evolution of magnesi... Shear spinning is an important method for metal shell forming.However,due to the poor plasticity of magnesium alloy,limited research exists on its spinning forming.Understanding the microstructure evolution of magnesium alloy during shear spinning is the key to realizing its controllable spinning forming.In this work,the microstructure,mechanical properties and fracture behavior of Mg-5Zn-1Gd-1Y-1Mn(ZGWM5111)alloy formed by shear spinning were investigated,and the dynamic recrystallization behavior and texture evolution during shear spinning were clarified.The results show that compared with the traditional plastic deformation,the thickness reduction of ZGWM5111 alloy in shear spinning is very small,and the microstructure can be changed significantly only by shear stress.The shear stress of the alloy varies during the spinning process,influencing both the recrystallization driving force and subgrain mobility.This leads to an evolution in the recrystallization mechanism,progressing from twin-induced to continuous,and ultimately to discontinuous dynamic recrystallization.Different from the existing research on magnesium.alloys,the recrystallization grains of ZGWM5111 alloy are continuously refined during the spinning process,and the basal texture strength is also continuously enhanced.In addition,the mechanical properties of ZGWM5111 alloy were significantly improved after shear spinning,especially the elongation was doubled compared with that before spinning,which changes the fracture mode from brittle fracture to ductile-brittle mixed fracture. 展开更多
关键词 Mg-Zn-Gd-Y-Mn Shear spinning Microstructure Recrystallization
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Hot Deformation Behavior and Microstructure Evolution of Platinum 认领 引用
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作者 Tang Huiyi Luan Baifeng +3 位作者 Zhang Fuen Xiao Yuchen Chai Linjiang Wu Baoan 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2026年第7期1673-1682,共10页
The hot deformation behavior of platinum was investigated through hot compression experiments.A constitutive equation for the prediction of the flow behavior of platinum was derived from analysis of stress-strain curv... The hot deformation behavior of platinum was investigated through hot compression experiments.A constitutive equation for the prediction of the flow behavior of platinum was derived from analysis of stress-strain curves.Using the constitutive equation,the peak stress of platinum during hot working was calculated across varying temperatures and strain rates.Results show that the predicted values have strong agreement with experimental results.Electron backscatter diffraction analysis further reveals the thermal deformation mechanisms under distinct conditions within the safe processing region.The optimal processing parameters are identified as deformation temperatures of 860-910 K and strain rates of 0.01-0.1 s−1.Discontinuous yielding observed at elevated strain rates is attributed to the multiplication and movement of the mobile dislocations at grain boundaries. 展开更多
关键词 platinum microstructure evolution hot deformation processing maps strain rate
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Excellent superplasticity for lamellar microstructure in nugget of a double-sided friction stir welded Ti-4.5Al-3V-2Mo-2Fe alloy joint 认领 引用
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作者 Peng Han Wen Wang +7 位作者 Jun Cai Jia Lin Hubin Yang Qianzhi Ma Feng Gao Ke Qiao Fengming Qiang Kuaishe Wang 《Metals Advances》 SCIE EI CAS CSCD 2026年第2期110-123,共14页
This study successfully achieved the welding of Ti-4.5Al-3V-2Mo-2Fe alloy using double side-friction stir welding.The microstructure of the nugget was characterized using a scanning electron microscope,electron backsc... This study successfully achieved the welding of Ti-4.5Al-3V-2Mo-2Fe alloy using double side-friction stir welding.The microstructure of the nugget was characterized using a scanning electron microscope,electron backscatter diffraction,and transmission electron microscope.High-temperature tensile tests were conducted to evaluate the superplastic deformation behavior of the nugget at temperatures ranging from 700℃ to 800℃ and strain rates of 1×10-3s-1-3×10-2 s-1.Results revealed that the nugget predominantly consisted of coarseβgrains,a small amount of grain boundaryα,and a large number of lamellarαwithin the coarseβgrains.An excellent superplasticity of 1400% was achieved at 750℃ and 3×10-3s-1 in the nugget.This was mainly because the lamellar microstructure underwent significant dynamic spheroidization during the initial stage of superplastic deformation.During the dynamic spheroidization process,some lamellarαgrains grow abnormally,absorbing a large number of low-angle grain boundaries and thus providing a favorable condition for their subsequent continuous dynamic recrystallization.Meanwhile,the abnormally grownαgrains quickly engulf the β phase,reducing the size and proportion of the β phase in the tensile specimen.These fine grained and moderate proportions of the β phase effectively coordinated the grain boundary sliding at the later stages of superplastic deformation.Therefore,the dynamic spheroidization mechanism in the initial stage of superplastic deformation was continuous dynamic recrystallization,and the superplastic deformation mechanism was continuous dynamic recrystallization coordinated with grain boundary sliding.Based on these findings,a novel method was proposed to enhance high strain rate superplasticity by introducing prestrain to induce continuous dynamic recrystallization in the lamellar microstructure.This approach increased the superplastic elongation of the nugget from 345%to 520%at 750℃ and a high strain rate of 1×10-2s-1.The study offers valuable insights for achieving superior superplastic forming of Ti-4.5Al-3V-2Mo-2Fe alloy joints. 展开更多
关键词 Titanium alloys Lamellar microstructure Superplasticity
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Effect of rolling temperature on microstructure and mechanical properties of Ni-W-Co-Ta alloy 认领 引用
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作者 Jin-jin TANG Yi XIONG +4 位作者 Yong LI Xiao-qin ZHA Xiu-ju DU Hua-fei LI Feng-zhang REN 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期887-901,共15页
The effect of warm rolling temperature(500-900℃)on the microstructure and mechanical properties was investigated for a Ni-W-Co-Ta alloy to achieve excellent strength-plasticity synergy.The results showed that the all... The effect of warm rolling temperature(500-900℃)on the microstructure and mechanical properties was investigated for a Ni-W-Co-Ta alloy to achieve excellent strength-plasticity synergy.The results showed that the alloy exhibited high-density dislocations and deformation bands when rolled below 750℃.The nano-Ni4W phase precipitated when rolled at 700-900℃,with the higher deformation temperature,the amount and size of precipitates increased.At 900℃,dissolution of the precipitated Ni4W and dynamic recrystallization of the matrix occurred.Consequently,the strength and hardness firstly decreased,then increased,and decreased again as the deformation temperature increased.An excellent strength-plasticity synergy was achieved through the combined effects of precipitation strengthening and deformation twins strengthening of Ni4W:with a tensile strength of 2010 MPa,a yield strength of 1839 MPa,a microhardness of HV 587,and an elongation of 13.2%when the alloy was warm-rolled at 750℃. 展开更多
关键词 Ni-W-Co-Ta alloy warm rolling microstructure mechanical properties
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Microstructure Engineering Toward High Cost-Effective Nd-Fe-B Sintered Magnets:A Review 认领 引用
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作者 Dongmin Zhang Minggang Zhu +3 位作者 Xu Sun Qisong Sun Xiaolong Song Jingyan Zuo 《Rare Metals》 SCIE EI CAS CSCD 2026年第7期34-78,共45页
Nd-Fe-B sintered magnets,critical for enhancing electromechanical conversion efficiency and operational stability in wind turbines and electric vehicle drives,are prized for their outstanding coercivity,high remanence... Nd-Fe-B sintered magnets,critical for enhancing electromechanical conversion efficiency and operational stability in wind turbines and electric vehicle drives,are prized for their outstanding coercivity,high remanence,and superior maximum energy product.However,the coercivity-remanence trade-off,combined with severe imbalances in rare-earth resource utilization,presents two fundamental bottlenecks hindering the development of cost-effective high-performance Nd-Fe-B sintered magnets.To overcome these limitations,significant research efforts are focused on the in-depth exploration,optimization,and innovative design of microstructures.This review synthesizes the world-wide advances and the author group's latest findings in multidimensional microstructural engineering,anchored in the characteristic microstructural features formed via powder metallurgy technology.It primarily examines the technical strategies,underlying mechanisms and economic evaluation across grain size and morphology optimization,spatial distribution control of the Nd6Fe13Ga phase,grain boundary diffusion sources iteration and process improvements,advancements in dual main-phase Ce magnets,and unique gradient structure design.The persistent challenges for future Nd-Fe-B sintered magnets development and the emerging role of machine learning in guiding technological process,performance prediction,microstructure characterization,and novel permanent magnets discovery are also highlighted. 展开更多
关键词 cost-effectiveness machine learning microstructure engineering Nd-Fe-B persistent challenges
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Effects of multi-directional forging combined with hot rolling on microstructure and mechanical properties of 7050 aluminum alloy 认领 引用
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作者 Xiao-fen TAN Hao-wei HUANG +3 位作者 Ze-kun LIAO Wen-bin ZHANG Xiao-peng LIANG Hui-zhong LI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第7期1988-2004,共17页
Multi-directional forging at 450°C combined with rolling at 300°C and 470°C was applied to a 7050 aluminum alloy prior to heat treatment.The effects of rolling temperature on the microstructure of the a... Multi-directional forging at 450°C combined with rolling at 300°C and 470°C was applied to a 7050 aluminum alloy prior to heat treatment.The effects of rolling temperature on the microstructure of the alloy were analyzed using optical microscopy,X-ray diffraction,scanning electron microscopy,electron backscatter diffraction and transmission electron microscopy.After solution treatment,the average grain size of the alloy measured from high-angle grain boundaries was approximately 20μm,compared to 100μm before forging.After artificial aging,the yield strength,ultimate tensile strength and elongation after fracture of the samples rolled at 300°C were(609.9±5.5)MPa,(662.4±1.7)MPa and(18.5±1.2)%,respectively.In the case where the alloy was rolled at 470°C,the corresponding values were(592.7±4.2)MPa,(641.0±3.9)MPa and(18.7±0.9)%,respectively. 展开更多
关键词 7050 aluminum alloy multi-directional forging rolling microstructure mechanical properties
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Microstructure and tribological properties of Y2O3-doped Fe-based alloy coatings by laser cladding 认领 引用
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作者 Huo-ping Zhao Li-yao Li +5 位作者 Ming-xue Shen Qiang Hu Han-yu Zhou Ye-long Xiao De-ying Li Shao-peng Liu 《China Foundry》 SCIE EI CAS CSCD 2026年第2期254-262,共9页
The laser-clad Fe45 alloy coating inherently comprises multiple crystalline phases,resulting in a heterogeneous microstructural distribution that influences its performance.In this study,the rare earth yttria(Y2O_(... The laser-clad Fe45 alloy coating inherently comprises multiple crystalline phases,resulting in a heterogeneous microstructural distribution that influences its performance.In this study,the rare earth yttria(Y2O3)was employed to modify laser-clad Fe45 alloy coatings,and the effects of Y2O3 addition on their microstructure,microhardness,and tribological properties were investigated.As the Y2O3 content increases from 0%to 0.3wt.%,the dominant microstructure transforms from columnar crystals to fine cellular and equiaxed crystals.The modified coating with 0.3wt.%Y2O3 achieves a surface hardness of 568 HV0.3and a wear volume of 1,735.41 um~3,representing a 14.06%increase in hardness and a 51.16%reduction in wear volume compared to the undoped coating.Further increasing the Y2O3 content from 0.3wt.%to 0.9wt.%gradually leads to the emergence of a coarser feather-like microstructure,characterized by a dendritic framework with inter-dendritic equiaxed crystals.Concurrently,both the hardness and wear resistance of the coating decrease.Nevertheless,all Y2O3-modified coatings surpass the undoped Fe45 coating in both hardness and wear resistance.Appropriate Y2O3 doping effectively refines the Fe45 alloy coating's microstru cture and induces lattice distortion,thereby enhancing its hardness and wear resistance. 展开更多
关键词 Fe-based alloy laser cladding rare-earth oxide microstructure tribological properties
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A review on the biomedical Ti-Cu alloys:Design,preparation,microstructure and properties 认领 引用
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作者 Kunmao Li Shengfeng Zhou +2 位作者 Jing Liu Feng Yang Chengliang Yang 《Metals Advances》 SCIE EI CAS CSCD 2026年第1期47-67,共21页
In clinical fields with a high risk of infection,such as orthopedics and dentistry,stringent requirements are imposed on the mechanical properties,biocompatibility,and antibacterial performance of biomedical materials... In clinical fields with a high risk of infection,such as orthopedics and dentistry,stringent requirements are imposed on the mechanical properties,biocompatibility,and antibacterial performance of biomedical materials.As an emerging functional biomedical alloy,Titanium-copper(Ti-Cu)alloys have received increasing attention due to their unique composition and microstructure,which endow these materials with favorable mechanical strength,biological activity,and long-lasting antibacterial functionality.However,a systematic summary of the existing research findings remains lacking.In this review,the classification and fundamental properties of Ti-Cu alloys are first outlined.Recent progress in design strategies,fabrication techniques,microstructural characteristics,mechanical behavior,wear resistance,corrosion performance,and biological properties is comprehensively reviewed.Special emphasis is placed on the dual forms of Cu(solid solution Cu and Ti2Cu phase)and their synergistic effects on both mechanical and biological performance.The antibacterial mechanisms and biosafety of Cu are specifically summarized,and its antibacterial efficacy and tissue compatibility are evaluated based on in vitro studies and animal models.Based on these findings,the key challenges associated with the practical application of Ti-Cu alloys are analyzed,and potential directions for optimization and future development are proposed.The review concludes with a concise summary and several forward-looking perspectives. 展开更多
关键词 Biomedical material Ti-Cu alloys Microstructure Processing Antibacterial properties
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Tailoring microstructure and mechanical properties of high-pressure die-cast Mg-RE-Gd alloys via trace Al additions 认领 引用
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作者 Lingyun Feng Xixi Dong +4 位作者 Shihao Wang Qing Cai Hangbiao Mi Wei Guo Shouxun Ji 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第4期511-528,共18页
A trade-off between strength and ductility often constrains the widespread application of high-pressure die-casting(HPDC)Mg-RE alloys.This study modulates the intermetallic compounds at the grain boundary(GB)in Mg-3.5... A trade-off between strength and ductility often constrains the widespread application of high-pressure die-casting(HPDC)Mg-RE alloys.This study modulates the intermetallic compounds at the grain boundary(GB)in Mg-3.5RE-1.5Gd alloys through trace Al additions(0,0.5,and 1.0 wt.%).Multiscale characterization and density functional theory(DFT)revealed a transition from metastable Mg3RE(Al-free)to petal-like Al2RE3(0.5Al),followed by the coexistence of blocky Al2RE and striped Al11RE3(1.0Al).As the Al content increases,the Mg12RE network remains the major phase,but its connectivity weakens.At room temperature(RT),yield strength(YS)decreases from 175 to 169 and 165 MPa,whereas ultimate tensile strength(UTS)increases from 180 to 200 and 205 MPa,and elongation(El)rises from 1.9% to 2.3% and 2.4%.At 250℃,the El increased while both YS and UTS decreased.At 300℃,the Al-containing alloy exhibited a comparatively high level of El,though this was lower than that observed in the Al-free alloy.This outcome is consistent with the weakened Mg12RE network connectivity.The fracture analysis revealed a mixed quasi-cleavage fracture with dimples at RT.At elevated temperatures,the predominant form of fracture is intergranular ductile fracture.DFT calculations confirm that Al-RE compounds exhibit more negative formation enthalpies and higher moduli than Mg-RE phases.However,the continuous Mg12RE framework phase provides superior GB pinning and load transfer capabilities.The present study elucidates the Al-mediated phase control mechanism,thus offering a viable alloy design pathway for the optimization of HPDC Mg-RE alloys. 展开更多
关键词 Magnesium alloys Microstructures Mechanical properties DFT Strengthening mechanisms
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Industrial experimental study on effect of different treatments on inclusions, microstructure and mechanical properties of Al-killed low-alloy high-strength steel Q355B 认领 引用
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作者 Qing Liu Min Wang +2 位作者 Hao Wang Li-Dong Xing Yan-Ping Bao 《Journal of Iron and Steel Research International》 SCIE EI CSCD 2026年第2期299-317,共19页
An industrial scale test was conducted to investigate the effects of no treatment,Ca treatment,Ce treatment and Ca+Ce composite treatment on the modification of inclusions,microstructure and mechanical properties of A... An industrial scale test was conducted to investigate the effects of no treatment,Ca treatment,Ce treatment and Ca+Ce composite treatment on the modification of inclusions,microstructure and mechanical properties of Al-killed Q355B steel.Results showed that the stability of the continuous casting process was improved when Ca pretreatment was added before Ce treatment compared to Ce treatment alone.After Ca+Ce composite treatment,the lowest total oxygen content and average diameter,lower number density and the smallest aspect ratio of inclusions were obtained.The thermodynamic calculations showed that the phases stabilized under the Ce-treated and Ca+Ce composite-treated steel compositions were Al11O18Ce+CeAlO3 and CeAlO3+CaO–Al2O3+liquid inclusion,respectively.It was also found that the oxygen content in the steel affects the Ce modification on inclusions and needs to be reduced before modification.The Ca to Ce ratio had a large effect on the composition of inclusions in the case of Ca+Ce composite treatments.Furthermore,adding rare earth Ce could effectively refine the solidification structure,improve micro-segregation,and also obtain finer equiaxed ferrite grains and dense pearlite lamellar structure.Moreover,a small amount of Ce treatment does not have a significant effect on the strength of the steel,but higher cleanliness and finer organization can have a positive effect on the plasticity and toughness of the material. 展开更多
关键词 Q355B steel Cerium Inclusion Microstructure Thermodynamic calculation Mechanical property
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Microstructure and properties of Cu-Ni-Co-Si alloy designed by cluster formula approach 认领 引用
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作者 Shi-fang LI Zhu XIAO +3 位作者 Xiang-peng MENG Zhou LI Yan-lin JIA Yan-bin JIANG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2026年第3期872-886,共15页
A Cu-1.9Ni-1.9Co-0.9Si(mass fraction,%)alloy with high strength and electrical conductivity was designed by cluster formula approach.The microstructure evolution of the alloy during thermomechanical treatment was syst... A Cu-1.9Ni-1.9Co-0.9Si(mass fraction,%)alloy with high strength and electrical conductivity was designed by cluster formula approach.The microstructure evolution of the alloy during thermomechanical treatment was systematically investigated.The strengthening mechanism and electrical conductivity of the alloy were discussed in detail.The optimal thermomechanical treatment process was as follows:solid solution→80%cold rolling→(450℃,4 h)aging→50%cold rolling→(400℃,4 h)aging.The designed alloy achieved excellent comprehensive properties with a microhardness of HV 260,a yield strength of 843 MPa,a tensile strength of 884 MPa,and an electrical conductivity of 42.6%(IACS).Compared to direct aging treatment,the designed alloy subjected to multi-stage thermomechanical treatment had refined grains,high density of dislocations,and accelerated of precipitation of(Ni,Co)2Si precipitates.High strength was mainly attributed to the combined effect of dislocation strengthening,work hardening and sub-grain strengthening,while good electrical conductivity was maintained through the precipitation of the large number of nanoparticles. 展开更多
关键词 Cu-Ni-Co-Si alloys cluster formula approach thermomechanical treatment microstructure strengthening mechanism
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Stray grains evolution and high-temperature stress rupture behavior of crystallographic lamellar microstructure in Ni-based superalloys prepared by laser powder bed fusion 认领 引用
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作者 Peng Wang Jing-jing Liang +10 位作者 Yu-ping Zhu Wei Song Qiao-lei Li Yi Qiu Ying-ju Li Yi-zhou Zhou Han-lin Liao Lei Shi Li-ming Lei Xiao-feng Sun Jin-guo Li 《China Foundry》 SCIE EI CAS CSCD 2026年第1期45-54,共10页
The unique crystallographic lamellar microstructure(CLM) Ni-based superalloys fabricated by laser powder bed fusion(LPBF) exhibits excellent tensile properties.This study aims to investigate CLM's high-temperature... The unique crystallographic lamellar microstructure(CLM) Ni-based superalloys fabricated by laser powder bed fusion(LPBF) exhibits excellent tensile properties.This study aims to investigate CLM's high-temperature stress rupture behavior and use these findings to improve the additive manufacturing process.The result shows that the high temperature-induced intergranular fracture in grain region is responsible for stress rupture failure under both conditions of 760 ℃/780 MPa and 980 ℃/260 MPa.Among them,the sub-grain boundary fracture occurs only under high temperature and low stress,980 ℃/260 MPa.Due to the severe intergranular fracture induced by stray grains,the stress rupture life is very low under both conditions.According to the finite element simulation,the formation of stray grains stems from the unstable heat flow within the melt pool during the process.In addition,the shorter stress rupture lifetime does not excite a more pronounced dislocation network around the γ′ phase.However,the deformation twins can still be activated inside the grains,so it has excellent plasticity under both test conditions.Finally,this work indicates that the future optimization of CLM by LPBF should focus on eliminating of high-angle grain boundaries in grains. 展开更多
关键词 crystallographic lamellar microstructure Ni-based superalloys additive manufacturing mechanical properties
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