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Microstructures,mechanical properties and corrosion resistances of FCC CoCrFeNiTi high-entropy alloys prepared by pre-alloyed powder mixing and vacuum laser-directed energy deposition 认领 引用
1
作者 Jian Zhu Shuhao Zhao +3 位作者 Zhen Li Yi Xu Shuai Wu Xidong Hui 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2026年第6期2029-2040,共12页
In this study,vacuum laser-engineered directed energy deposition(V-LDED)was employed to fabricate CoCrFeNiTix(x=0.1,0.2,0.3)high-entropy alloys(HEAs)by strategically mixing equiatomic pre-alloyed CoCrFeNi and CoCrF... In this study,vacuum laser-engineered directed energy deposition(V-LDED)was employed to fabricate CoCrFeNiTix(x=0.1,0.2,0.3)high-entropy alloys(HEAs)by strategically mixing equiatomic pre-alloyed CoCrFeNi and CoCrFeNiTi powders.With increas-ing Ti content,the lattice distortion of the HEAs intensified,grains were refined,and precipitate content increased;however,the face-centered cubic(FCC)structure remained the predominant structure.The strength and plasticity of the HEAs initially increased and then decreased with the addition of Ti.The CoCrFeNiTi0.3(Ti0.3)alloy exhibited the best mechanical properties,with a tensile yield strength(TYS)of 604 MPa,an ultimate tensile strength(UTS)of 882 MPa,and a plastic elongation of 13.5%.Compared to the Ti-free alloy,the TYS and UTS were increased by 124%and 83%,respectively.The CoCrFeNiTi0.2(Ti0.2)alloy showed the best corrosion resistance with the corrosion potential(Ecorr),corrosion current density(Icorr),passivated film resistor(Rc),and charge transfer resistance(Rct)values of-0.208 V,4.889×10-7A/cm2,7.03×103Ω/cm2,and 8.50×105Ω/cm2,respectively.The addition of Ti increased the Cr and Ti contents in the passive film,which are easily passivated elements.The multiple effects of Ti on the corrosion resistance were mainly attributed to the formation and composition of the passive film and density of the precipitates. 展开更多
关键词 vacuum laser-engineered directed energy deposition CoCrFeNiTi alloys microstructures mechanical properties corrosion resistance
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Solid-state additively manufactured Mg-Al-Zn-Mn alloys:Effects of Al content on microstructures and mechanical properties 认领 引用
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作者 Hui Wang Yidi Li +3 位作者 Ruilin Lai Chenying Shi Biaobiao Yang Yunping Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第5期254-272,共19页
Additive friction stir deposition(AFSD),as an advanced solid-state additive manufacturing technique,offers significant potential for fabricating large-scale engineering structural components.In this study,Mg-xAl-1Zn-0... Additive friction stir deposition(AFSD),as an advanced solid-state additive manufacturing technique,offers significant potential for fabricating large-scale engineering structural components.In this study,Mg-xAl-1Zn-0.5Mn(x=3,6,and 9 wt.%)alloys were fabricated via AFSD.And the effect of Al content on the microstructural evolution,mechanical properties,and fracture behavior was systematically investigated.The results reveal that all AFSD AZ series Mg alloys exhibit refined equiaxed grains and a typical basal texture,with the(0002)axis parallel to the build direction(BD).However,increasing Al content results in a gradual decrease in both average grain size and basal texture intensity.Alloy with low content of Al(≤6 wt.%)exhibits uniform grain size and precipitate distribution,whereas alloy with high content of Al(e.g.,9 wt.%)displays a bimodal structure composed of fine grain bands decorated byβ-Mg17Al12 phase near grain boundaries and coarse grain bands.For this,a clear strength-ductility trade-off is observed:with increasing Al content,the yield strength rises from 152.8±17.9 MPa to 215.5±17.7 MPa,accompanied by a reduction in fracture elongation from 15.9±0.6%to 12.3±0.6%.These findings can offer theoretical insight and practical guidance for the AFSD AZ series(Mg-Al-Zn-Mn)alloys with synergistic strength and ductility. 展开更多
关键词 Additive friction stir deposition Mg alloy Microstructure EBSD Mechanical properties
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Effects of deep cryogenic treatment on microstructures,mechanical properties and dimensional stability of beryllium for inertial devices 认领 引用
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作者 REN Peng-he XIAO Lai-rong +1 位作者 ZHAO Xiao-jun CAI Zhen-yang 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1487-1498,共12页
This study investigated the effects of deep cryogenic treatment(DCT)on hot isostatic pressed(HIP)beryllium for inertial devices,focusing on residual stress,microstructure,tensile properties,and dimensional stability.T... This study investigated the effects of deep cryogenic treatment(DCT)on hot isostatic pressed(HIP)beryllium for inertial devices,focusing on residual stress,microstructure,tensile properties,and dimensional stability.The findings revealed that during DCT,residual stress in beryllium increased gradually due to non-uniform volumetric contraction and mismatch stress,reaching a 59.9%increase from initial levels after 200 h of DCT.DCT led to significant grain refinement and an increase in dislocation density.In 200 h DCT-treated beryllium,geometric necessary dislocation(GND)density increased 17.9%,grain size decreased 12.3%,and therefore yield strength and tensile strength improved by 4.2% and 5.6%,respectively.The dimensional stability of HIP beryllium was significantly enhanced by DCT,and the improvement tended to increase with the duration of DCT.The cumulative size changes of beryllium after 200 h of DCT during both cold exposure and cold cycling decreased significantly by 86% and 50%,respectively,compared to those of HIP beryllium.Furthermore,the residual tensile strength and retention rate increased by 12.5% and 5.5%,respectively,after undergoing room-temperature creep at 100 MPa for 1000 h. 展开更多
关键词 inertial devices beryllium deep cryogenic treatment dimensional stability microstructure mechanical properties
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Recent progress in high-strength Mg-Gd-based alloys:the role of heat treatments in controlling microstructures and mechanical properties 认领 引用
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作者 Linqing Pei Ming Sun +1 位作者 Meifeng He Yunhao Zhao 《Journal of Rare Earths》 SCIE EI CAS CSCD 2026年第5期1339-1351,共13页
Lightweight and high-strength Mg-Gd magnesium(Mg)alloys have important application prospects in automotive,aerospace and military fields.Heat treatment is the most crucial method to improve service properties of Mg-Gd... Lightweight and high-strength Mg-Gd magnesium(Mg)alloys have important application prospects in automotive,aerospace and military fields.Heat treatment is the most crucial method to improve service properties of Mg-Gd alloys,such as room-temperature mechanical properties,high-temperature mechanical properties and creep resistance.In this paper,the recent research progress in heat treatment of Mg-Gd alloys is systematically reviewed.The heat treatment principles of Mg-Gd alloys are presented.The effects of solution,aging,homogenization and annealing heat treatments on microstructure and mechanical properties of conventionally prepared Mg-Gd alloys are summarized.Then the effects of heat treatment on microstructure and mechanical properties of Mg-Gd alloys prepared with additive manufacturing(AM)are briefly introduced.Finally,the future research direction of heat treatment of Mg-Gd alloys is prospected.This article will provide important reference for the development of high-strength Mg-RE alloys. 展开更多
关键词 Mg-Gd alloy Mg alloy Heat treatment Precipitates Mechanical properties Rare earths
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A novel approach to simultaneously enhancing the mechanical properties and thermal conductivity of magnesium alloys:Heterogeneous microstructures 认领 引用
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作者 Wenyuan Cong Feng Wang +5 位作者 Xudong Du Zhi Wang Le Zhou Ziqi Wei Pingli Mao Jian Jiao 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2026年第3期580-595,共16页
The application of magnesium alloys is hindered by the inherent contradiction between mechanical performance and thermal conductivity.Achieving simultaneous enhancement of both properties is crucial for broadening the... The application of magnesium alloys is hindered by the inherent contradiction between mechanical performance and thermal conductivity.Achieving simultaneous enhancement of both properties is crucial for broadening their applications.In this study,Mg-5Zn-xCu-0.5Zr(x=0,0.5,1,2)alloys were fabricated using semi-solid rheo-diecasting(RDC).The microstructure was characterized via OM,SEM,XRD,TEM and EBSD,and its influence on mechanical properties and thermal conductivity was analyzed.The results show that adding Cu refines the grain size,induces the formation of the MgZnCu phase,and reduces solidification shrinkage defects.The RDC Mg-5Zn-xCu-0.5Zr alloy features a heterogeneous microstructure comprising primaryα-Mg(α1)with low solute content,secondaryα-Mg(α2)with high solute atom content,and intergranular second phases.This heterogeneous structure synergistically enhances both mechanical properties and thermal conductivity.Specifically,α1 grains and the MgZnCu phase reduce lattice distortion,thereby improving thermal conductivity,whileα2 generates more dislocations during tensile deformation,contributing to enhanced mechanical properties.Additionally,a small amount of MgZnCu phase contributes to simultaneous improvements in both properties.However,excessive MgZnCu phase can lead to stress concentration due to dislocation pile-up,causing fracture and degrading mechanical properties.Among the alloys studied,the Mg-5Zn-1Cu-0.5Zr alloy exhibits the best combination of mechanical and thermal properties,with a tensile strength of 221 MPa,yield strength of 109 MPa,elongation of 5.72%,and thermal conductivity of 113.8 W/(m·K).This demonstrates the successful simultaneous enhancement of both mechanical and thermal properties in magnesium alloys. 展开更多
关键词 Magnesium alloys Semi-solid rheo-diecasting Tensile properties Thermal conductivity
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Microstructures and mechanical properties of argon tungsten arc welded TiAl joints using Ti-Nb binary filler alloy 认领 引用
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作者 Hanyu Zhao Zhiliang Zhai +2 位作者 Wei Liu Shuai Huang Tao Lv 《China Welding》 CAS 2026年第2期50-56,共7页
Argon tungsten arc welding of TiAl base alloy using Ti-30Nb(at.%)filler metals was conducted.The results indicated that sound TiAl welded joints were achieved with preheating temperature of 498℃.Microstructure and pr... Argon tungsten arc welding of TiAl base alloy using Ti-30Nb(at.%)filler metals was conducted.The results indicated that sound TiAl welded joints were achieved with preheating temperature of 498℃.Microstructure and properties of the welded TiAl joints were investigated.A transitional reaction zone,primarily consisting ofγ-TiAl andα2-Ti3Al,was observed at the interface between the weld zone and the TiAl base alloy.Due to the intense reaction between the TiAl base metal and the Ti-Nb filler metal,amounts of acicular intermetallic compounds were formed within the central region of the weld zone,consisting ofα2-Ti3Al and B2 phases.The tensile fracture of the joints exhibited brittle cleavage pattern.The average tensile strength of the welded joints at room-temperature reached 372.6 MPa,about 73.1%of the base metal(BM),with joint fracture occurred in the weld zone.Owing to the solid-solution strengthening effect of Nb,the joint tensile strength retained 326.6 MPa at 700℃,and 300 MPa at 750℃. 展开更多
关键词 TiAl alloy Ti-Nb filler alloy Gas tungsten arc welding Microstructure evolution α2-Ti3Al B2 phase
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Progress in additive manufacturing of nickel-based superalloys:materials,processing,microstructures,properties and alloy design 认领 引用 被引量：3
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作者 Li Gong Yu-Bo Li +3 位作者 Xiao-Pei Wang Sai Li Zhi-Gang Yang Hao Chen 《Rare Metals》 SCIE EI CAS CSCD 2025年第10期7041-7087,共47页
Notable advancements have been made in the additive manufacturing(AM)of aerospace materials,driven by the needs for integrated components with intricate geometries and small-lot production of high-value components.Nic... Notable advancements have been made in the additive manufacturing(AM)of aerospace materials,driven by the needs for integrated components with intricate geometries and small-lot production of high-value components.Nickel-based superalloys,pivotal materials for high-temperature bearing components in aeroengines,present significant challenges in the fabrication of complex parts due to their great hardness.Huge attention and rapid progress have been garnered in AM processing of nicklebased superalloys,largely owing to its distinct benefits in the freedom of fabrication and reduced manufacturing lifecycle.Despite extensive research into AM in nickel-based superalloys,the corresponding results and conclusions are scattered attributed to the variety of nickel-based superalloys and complex AM processing parameters.Therefore,there is still a pressing need for a comprehensive and deep understanding of the relationship between the AM processing and microstructures and mechanical performance of nickel-based superalloys.This review introduces the processing characteristics of four primary AM technologies utilized for superalloys and summarizes the microstructures and mechanical properties prior to and post-heat treatments.Additionally,this review presents innovative superalloys specifically accommodated to AM processing and offers insights into the material development and performance improvement,aiming to provide a valuable assessment on AM processing of nickel-based superalloys and an effective guidance for the future research. 展开更多
关键词 Additive manufacturing Nickel-based superalloys Processing optimization Microstructures and mechanical properties Alloy design
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Regulation of GNPs on YSZ composites:Phase transformation,microstructures and nanomechanical properties 认领 引用 被引量：1
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作者 Chenkun SUN Xiaodong ZHANG +3 位作者 Hongzhi JI Yiyong WU Oleg V.TOLOCHKO You WANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第6期605-620,共16页
It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) c... It is one of the big bottleneck problems for graphene to be uniformly distributed in ceramic matrix composites. A two-step approach was applied to prepare Graphene Nanoplatelets/Yt tria-Stabilized Zirconia(GNPs/YSZ) composites. Initially, GNPs were combined with YSZ through nanoparticle regranulation technology to obtain uniformly dispersed powders. Subsequently, the prepared powders were sintered by Spark Plasma Sintering(SPS). Systematic investigation was carried out to examine how GNPs regulate the phase, microstructures, and nanomechanical properties of GNPs/YSZ composite ceramics with different sintering temperatures.Results show that the GNPs can inhibit the coalescence of adjacent grains in YSZ ceramics. Herein,we propose that the intensity ratio of 2D peak to G peak of GNPs in Raman spectrum serves as a key indicator to assess the nanomechanical properties of GNPs/YSZ composites. When the intensity ratio of 2D peak to G peak is 0.5–0.6, the GNPs/YSZ composites obtained in the sintering temperature range of 1 200–1 250.C exhibit excellent nanomechanical properties such as hardness,elastic modulus, wear and creep resistance. 展开更多
关键词 GNPs/YSZcomposites Nanoparticle regranulation technology Phase transformation Microstructures Nanomechanical properties
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Microstructures and mechanical properties of friction stir welded and processed high entropy alloys 认领 引用
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作者 Kang Chen Jian Miao +2 位作者 Huijie Zhang Qi Cheng Yingling Wang 《Defence Technology（防务技术）》 SCIE EI CAS CSCD 2026年第1期80-108,共29页
High entropy alloys(HEAs)have recently attracted significant attention due to their exceptional mechanical properties and potential applications across various fields.Friction stir welding and processing(FSW/P),as not... High entropy alloys(HEAs)have recently attracted significant attention due to their exceptional mechanical properties and potential applications across various fields.Friction stir welding and processing(FSW/P),as notable solid-state welding and processing techniques,have been proved effectiveness in enhancing microstructures and mechanical properties of HEAs.This review article summarizes the current status of FSW/P of HEAs.The welding materials and conditions used for FSW/P in HEAs are reviewed and discussed.The effects of FSW/P on the evolutions of grain structure,texture,dislocation,and secondary phase for different HEAs are highlighted.Furthermore,the influences of FSW/P on the mechanical properties of various HEAs are analyzed.Finally,potential applications,challenges,and future directions of FSW/P in HEAs are forecasted.Overall,FSW/P enable to refine grains of HEAs through dynamic recrystallization and to activate diverse deformation mechanisms of HEAs through tailoring phase structures,thereby significantly improving the strength,hardness,and ductility of both single-and dual-phase HEAs.Future progress in this field will rely on comprehensive optimization of processing parameters and alloy composition,integration of multi-scale modeling with advanced characterization for in-depth exploration of microstructural mechanisms,systematic evaluation of functional properties,and effective bridging of the gap between laboratory research and industrial application.The review aims to provide an overview of recent advancements in the FSW/P of HEAs and encourage further research in this area. 展开更多
关键词 High entropy alloys Friction stir welding/processing Microstructure Mechanical property
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Effect of pre-rolling temperature on microstructures, tensile properties and fracture behaviors of Al-5.9Zn-1.9Mg alloy during thermomechanical treatment 认领 引用
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作者 CHENG Jun-hua GUO Xiao-fang +3 位作者 LIU Chang SHAO Hong-bang LIU Yu HUANG Yuan-chun 《Journal of Central South University》 SCIE EI CAS CSCD 2025年第9期3237-3254,共18页
The microstructures,mechanical properties,and fracture behaviors of an Al-5.9Zn-1.9Mg alloy subjected to thermomechanical treatment across different pre-rolling temperatures have been exhaustively investigated in pres... The microstructures,mechanical properties,and fracture behaviors of an Al-5.9Zn-1.9Mg alloy subjected to thermomechanical treatment across different pre-rolling temperatures have been exhaustively investigated in present work.The pre-deformation temperature exerts a modest influence on grain morphology,while it profoundly impacts the dislocation configurations and precipitation behaviors.Elevating the rolling temperature from ambient to 170℃results in a reduction in dislocation density within grains accompanied by a notable enhancement in their distributional uniformity.While advancing the temperature to 320℃prompts the premature formation of precipitates during deformation,which diminishes the precipitation during the subsequent ageing.Tensile results reveal that the thermomechanical treatment incorporating pre-rolling at 170℃confers a substantial strengthening effect on the alloy on the basis of both grain boundary strengthening and dislocation strengthening stemmed from pre-deformation along with the precipitation strengthening generated by ageing.Furthermore,the microstructure exhibits a relatively scarce presence of inhomogeneous features such as dislocation pile-ups and micro shear bands,contributing favorably to enhance the ductility of the alloy that presents the mixture of cleavage fracture and dimple-induced failure. 展开更多
关键词 Al-Zn-Mg alloy thermomechanical treatment deformation temperature microstructures tensile properties
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Microstructures,mechanical properties,and strengthening mechanisms of the(NbMoTa)100−xCx refractory medium-entropy alloys 认领 引用 被引量：1
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作者 Xueqian Gou Ruqing Cao +2 位作者 Weihua Zhou Zheling Shen Yi Li 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第11期105-119,共15页
Refractory high/medium-entropy alloys(RH/MEAs)are known for their outstanding performance at el-evated temperatures;however,they usually exhibit poor room-temperature plasticity,which can be at-tributed to the non-uni... Refractory high/medium-entropy alloys(RH/MEAs)are known for their outstanding performance at el-evated temperatures;however,they usually exhibit poor room-temperature plasticity,which can be at-tributed to the non-uniform deformation that occurs at room temperature.Once cracks nucleate,they will rapidly propagate into vertical splitting cracks.Here,we introduce multiple phases including FCC and HCP phases into the NbMoTa RMEA via appropriate addition of carbon.The results show that multiple-phase synergy effectively suppresses non-uniform deformation,thereby delaying the onset of vertical splitting cracks.An optimal combination of compressive strength-plasticity is achieved by the(NbMoTa)92.5C7.5 alloy.The significant improvement in room-temperature mechanical properties can be attributed to its hierarchical microstructure:in the mesoscale,the BCC matrix is divided by eutectic structures;while at the microscale,the BCC matrix is further refined by abundant lath-like FCC precipitates.The FCC precip-itates contain high-density stacking faults,acting as a dislocation source under compressive loading.The HCP phase in the eutectic microstructures,in turn,acts as a strong barrier to dislocation movement and simultaneously increases the dislocation storage capacity.These findings open a new route to tailor the microstructure and mechanical properties of RH/MEAs. 展开更多
关键词 Refractory medium-entropy alloys Carbon Microstructures Mechanical properties Strengthening mechanisms
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Effect of Hot Working on Microstructures and Mechanical Properties of Gravity-Cast Al-8.3Zn-3.3Cu-2.2Mg HighStrength Aluminum Alloy 认领 引用 被引量：2
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作者 Qi Yushi Jin Yu +5 位作者 Wei Fangming Du Lanjun Ren Yan Liang Xueqian Chen Gang Du Zhiming 《稀有金属材料与工程》 SCIE EI CAS CSCD 北大核心 2025年第2期327-336,共10页
The microstructures and mechanical properties of Al-8.3Zn-3.3Cu-2.2Mg alloys prepared via hot extrusion and liquid forging methods were investigated.Results show that based on DEFORM simulation analysis,the optimal ho... The microstructures and mechanical properties of Al-8.3Zn-3.3Cu-2.2Mg alloys prepared via hot extrusion and liquid forging methods were investigated.Results show that based on DEFORM simulation analysis,the optimal hot extrusion parameters are determined as ingot initial temperature of 380°C and extrusion speed of 3 mm/s.The hot-extruded aluminum alloy after T6 heat treatment presents superior mechanical properties with yield strength of 519.6 MPa,ultimate tensile strength of 582.1 MPa,and elongation of 11.0%.Compared with the properties of gravity-cast and liquid-forged alloys,the yield strength of hot-extruded alloy increases by 30.8%and 4.9%,and the ultimate tensile strength improves by 43.5%and 10.2%,respectively.The significant improvement in tensile strength of the hot-extruded alloys is attributed to the elimination of casting defects and the refinement of matrix grain and eutectic phases.In addition,the hot-extruded alloy demonstrates superior plasticity compared with the liquid-forged alloy.This is because severe plastic deformation occurs during hot extrusion,which effectively breaks and disperses the eutectic phases,facilitating the dissolution and precipitation of the second phases and inhibiting the microcrack initiation. 展开更多
关键词 Al-Zn-Cu-Mg alloy hot extrusion liquid forging mechanical properties microstructure
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Effects of Ag addition on the microstructures and properties of Al–Mg–Si–Cu alloys 认领 引用 被引量：2
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作者 Li-zi He Yi-heng Cao +1 位作者 Yi-zhou Zhou Jian-zhong Cui 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2018年第1期62-72,共11页
Effects of Ag addition on the microsmactures, aging characteristics, tensile properties, electrochemical properties, and intergranu- lar corrosion （IGC） properties of Al 1.1Mg-0.8Si-0.9Cu-0.35Mn4）.02Ti alloy were i... Effects of Ag addition on the microsmactures, aging characteristics, tensile properties, electrochemical properties, and intergranu- lar corrosion （IGC） properties of Al 1.1Mg-0.8Si-0.9Cu-0.35Mn4）.02Ti alloy were investigated using scanning electronic microscopy and transmission electronic microscopy. The aging process of Al-Mg-Si-Cu alloys was accelerated by the addition of Ag. The strength of peak-aged Al-Mg-Si-Cu alloys was enhanced by Ag addition because of the high density of β＂- and L-phase age-hardening precipitates. The corrosion performance of the Al-Mg-Sii-Cu alloy is closely related to the aging conditions and is independent of the Ag content. The IGC susceptibility is serious in the peak-aged alloy because of the continuous distribution of Cu-rich Q-phase precipitates along grain boun- daries. Ag addition reduces the size of the grain-boundary-precipitate Q phase and the width of the precipitate-free zone and thus results in decreased IGC susceptibility of Al-Mg-Si Cu alloys. 展开更多
关键词 Al-Mg-Si-Cu alloys silver addition aging tensile properties corrosion properties microstructures
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Magnetic properties and microstructures of multi-component Sm–Co-based films prepared by high-throughput experiments 认领 引用 被引量：3
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作者 Xin-Rui Zheng Si-Zhe Liang +7 位作者 Zhao-Guo Qiu Yan-Song Gong Hong-Xia Meng Gang Wang Zhi-Gang Zheng Wei-Xing Xia De-Chang Zeng Ping Liu 《Rare Metals》 SCIE EI CAS CSCD 2025年第2期1284-1293,共10页
Sm–Co-based films play an irreplaceable role in special applications due to their high curie temperature and magnetocrystalline anisotropic energy,especially in heat-assisted magnetic recording(HAMR),but the complex ... Sm–Co-based films play an irreplaceable role in special applications due to their high curie temperature and magnetocrystalline anisotropic energy,especially in heat-assisted magnetic recording(HAMR),but the complex composition of Sm–Co phase and unclear synergistic coupling mechanisms of multi-elemental doping become the challenges to enhance the properties.In this work,a novel strategy combining magnetron sputtering and a high-throughput experiment method is applied to solve the above-mentioned problems.Fe/Cu co-doping highly increases the remanence while maintaining a coercivity larger than 26 kOe,leading to an enhancement of the magnetic energy product to 18.1 MGOe.X-ray diffraction(XRD)and high-resolution transmission electron microscope(HRTEM)reveals that SmCo5 phase occupies the major fraction,with Co atoms partially substituted by Fe and Cu atoms.In situ Lorentz transmission electron microscopy(LTEM)observations show that the Sm(Co,Cu)5 phase effectively prohibits domain wall motions,leading to an increase of coercivity(Hc).Fe doping increases the low saturation magnetization(Ms)and low remanence(Mr)due to the Fe atom having a higher saturation magnetic moment.The magnetization reversal behaviors are further verified by micromagnetic simulations.Our results suggest that Sm–Co-based films prepared via Fe/Cu co-doping could be a promising candidate for high-performed HAMR in the future. 展开更多
关键词 Magnetron sputtering High-throughput experiments Sm-Co Fe/Cu co-doping Magnetic properties Magnetic domain
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Creep properties and fracture behavior of AZ31B extruded sheets with mixed-grain microstructures of different morphologies 认领 引用
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作者 Xiaoxia Zhang Ming Li +6 位作者 Hongxia Wang Jiao Cui Lei Song Naidong Ren Lifei Wang Weili Cheng Kwangseon Shin 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第2期777-791,共15页
In this work,AZ31B extruded sheets with mixed-grain microstructures were prepared through extrusion.Samples of mixed-grain microstructure with different morphologies were selected from the AZ31B extruded sheets(referr... In this work,AZ31B extruded sheets with mixed-grain microstructures were prepared through extrusion.Samples of mixed-grain microstructure with different morphologies were selected from the AZ31B extruded sheets(referred to as M1 and M2 samples,respectively).The creep tests were performed on these samples at the temperature range of 150-200℃,and the stress level range of 50-100 MPa.The creep properties and fracture behavior of AZ31 extruded sheets with mixed-grain microstructures were studied.Results showed that the creep properties of the M2 sample always outperformed that of the M1 sample and M1 and M2 samples’creep was dominated by dislocation movement.The creep rate of M2 samples(1.5×10-7±1.1×10-10 s-1)is an order of magnitude lower than that of M1 samples(4.8×10-6±8.1×10-10 s-1)at 200℃under 50 MPa The high activity of basal slip and softening mechanism in the M1 sample significantly accelerated creep,resulting in a relatively high creep rate.Moreover,the stress concentration within the M1 sample caused by deformation incompatibility,increased the initiation and propagation of voids,ultimately leading to fracture and poorer creep performance.However,the numerous<10µm fine grains surrounding deformed coarse grains in the M2 sample facilitated better coordination of deformation through dislocation slip,effectively slowing down the initiation of voids during the creep process.Meanwhile,the strain was uniformly distributed within each grain,mitigating stress concentration,inhibiting voids propagation,and contributing to the superior creep resistance of the M2 sample. 展开更多
关键词 AZ31B extruded sheets Mixed-grain microstructure Creep properties Fracture behavior
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Molecular simulation study of the microstructures and properties of pyridinium ionic liquid[HPy][BF4]mixed with acetonitrile 认领 引用 被引量：1
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作者 XU Jian-Qiang MA Zhao-Peng +2 位作者 CHENG Si LIU Zhi-Cong ZHU Guang-Lai 《原子与分子物理学报》 CAS 北大核心 2025年第4期27-32,共6页
The microstructures and thermodynamic properties of mixed systems comprising pyridinium ionic liquid[HPy][BF4]and acetonitrile at different mole fractions were studied using molecular dynamics simulation in this wo... The microstructures and thermodynamic properties of mixed systems comprising pyridinium ionic liquid[HPy][BF4]and acetonitrile at different mole fractions were studied using molecular dynamics simulation in this work.The following properties were determined:density,self-diffusion coefficient,excess molar volume,and radial distribution function.The results show that with an increase in the mole fraction of[HPy][BF4],the self-diffusion coefficient decreases.Additionally,the excess molar volume initially decreases,reaches a minimum,and then increases.The rules of radial distribution functions(RDFs)of characteristic atoms are different.With increasing the mole fraction of[HPy][BF4],the first peak of the RDFs of HA1-F decreases,while that of CT6-CT6 rises at first and then decreases.This indicates that the solvent molecules affect the polar and non-polar regions of[HPy][BF4]differently. 展开更多
关键词 Pyridinium ionic liquids Thermodynamic properties Molecular dynamics simulation Radial distribution functions
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Effect of Carbon on the Microstructures and Stress Rupture Properties of a Polycrystalline Ni-Based Superalloy 认领 引用
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作者 Han Wang Shijie Sun +4 位作者 Naicheng Sheng Guichen Hou Jinguo Li Yizhou Zhou Xiaofeng Sun 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2025年第1期151-163,共13页
The effect of carbon content on the microstructures and stress rupture properties of a newly developed polycrystalline Ni-based superalloy with high Cr content has been studied.It was observed that both grain size and... The effect of carbon content on the microstructures and stress rupture properties of a newly developed polycrystalline Ni-based superalloy with high Cr content has been studied.It was observed that both grain size and the number of carbides increased with an increase in carbon content.After heat treatment,granular M23C6carbides were dispersed around MC carbides along grain boundaries and inside grains.The quantity of granular M23C6carbides increased while their sizes decreased.These findings can be verified with the results of thermodynamic calculation and differential scanning calorimetry analysis.The stress rupture times(975℃/225 MPa)increased from 13.3 to 25.5 h with the carbon content increased from 0.1 to 0.2 wt.%.The improvement can be attributed to two primary factors.Firstly,grain boundary is typically weak region during deformation process and the grain size increased as carbon content increased in the alloy.Secondly,carbides act as hindrances to impede dislocation movement,leading to dislocation entanglement.As carbon content rose,the quantity of carbides in interdendritic regions and grain boundaries increased,providing a certain degree of strengthening effect and resulting in a longer stress rupture time. 展开更多
关键词 Ni-based superalloy Microstructure Stress rupture property Carbon Carbide
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Effect of titanium addition on microstructures and magnetic properties of B-lean Nd-Fe-B sintered magnets 认领 引用
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作者 Qingfang Huang Qingzheng Jiang +7 位作者 Kexiang Zhong Renhui Liu Dawei Shi Gang Fu Yongjian Zhang Deqin Xu Dakun Chen Zhenchen Zhong 《Journal of Rare Earths》 SCIE EI CAS CSCD 2025年第10期2204-2211,I0005,共8页
The effect of Ti addition on microstructures and magnetic properties of B-lean(Pr,Nd)31.1Fe67.1-x(CoCuGa)1.4TixB0.9(wt%,x=0.0,0.1,0.2,0.3,0.4)sintered magnets were investigated.The remanence Bris slight... The effect of Ti addition on microstructures and magnetic properties of B-lean(Pr,Nd)31.1Fe67.1-x(CoCuGa)1.4TixB0.9(wt%,x=0.0,0.1,0.2,0.3,0.4)sintered magnets were investigated.The remanence Bris slightly reduced due to the deteriorated orientation degree and the diminished volume fraction of main phase caused by the existence of rod-shaped Ti-B-rich phase.However,the HcJobviously increases from1145 kA/m for x=0.0 sample to 1515 kA/m for x=0.2 sample.The results demonstrate that the increments of coercivity for x=0.2 and x=0.0 samples after post-sinter annealing(PSA)are 62.9%and 20.6%,respectively.Rod-shaped Ti-B-rich phase forms after Ti doping,which leads to the existence of6:13:1 type RE-Fe-(Cu,Ga)phase with high Fe content at triple junctions.This is beneficial to the formation of continuous thin grain boundaries with low Fe content,which can weaken the exchange coupling interaction between adjacent grains,leading to the improved coercivity. 展开更多
关键词 Ti doping B-lean Rare earths Magnetic property Thermal stability Microstructure
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Effect of iron content on microstructures and mechanical properties of new ultra-high strength Al−Zn−Mg−Cu alloys 认领 引用 被引量：2
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作者 Xin-yuan XU Lei JIANG +2 位作者 Xin-biao ZHANG Ming-hong MAO Jian-xin XIE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第10期3179-3190,共12页
The impact of Fe content on the microstructures and mechanical properties of an ultra-high strength aluminum alloy,namely,Al−10.50Zn−2.35Mg−1.25Cu−0.12Cr−0.1Mn−0.1Zr−0.1Ti,was investigated.It is found that the increas... The impact of Fe content on the microstructures and mechanical properties of an ultra-high strength aluminum alloy,namely,Al−10.50Zn−2.35Mg−1.25Cu−0.12Cr−0.1Mn−0.1Zr−0.1Ti,was investigated.It is found that the increase of Fe content leads to a notable rise in the volume fraction of microscale secondary phases,including(Cu,Fe,Mn,Cr)Al7,σphase(composed of Al,Zn,Mg,and Cu elements),and Al3(Zr,Ti).The formation of these secondary phases results in the depletion of certain phase-forming elements,thereby significantly reducing the quantity of strengthening phases.Fe imposes minimal impact on tensile strength,but it can significantly alter the elongation(δ).For instance,the average elongation of the alloy with 0.18 wt.%Fe(δ=4.5%)is less than half that of the alloy with Fe less than 0.1 wt.%(δ=9.9%−10.9%).The reduction in elongation is attributed to the combined effects of the formation of coarse secondary phases and the diminished quantity of strengthening phases around these coarse phases. 展开更多
关键词 Al−Zn−Mg−Cu alloy tensile property element distribution secondary phase Fe content
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Effect of double-extrusion following by stepwise-hot-rolling on microstructures and mechanical properties of Mg-Gd-Y-Zn-Zr alloy 认领 引用
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作者 Jinjun Wang Muhammad Abubaker Khan +4 位作者 Shang Dai Yun Feng Han Wang Mohamed A.Afifi Jingyuan Li 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2025年第9期4327-4345,共19页
Mg alloys with a combination of high strength and excellent ductility are increasingly required for structural applications.This study investigates the influence of advanced processing techniques on the mechanical pro... Mg alloys with a combination of high strength and excellent ductility are increasingly required for structural applications.This study investigates the influence of advanced processing techniques on the mechanical properties and microstructural evolution of Mg-Gd-Y-Zn-Zr alloys.Utilizing a combination of double extrusion and stepwise hot rolling followed by aging treatments,significant enhancements in the mechanical performance of these alloys are demonstrated.The processing techniques applied lead to notable refinement in grain-size and modifications in the microstructure,including the transformation of LPSO phases from 18R to 24R and the dispersion of β phase particles.These microstructural transformations contribute to a substantial increase in yield-strength,ultimate-tensile-strength,and ductility.Furthermore,findings reveal that these improvements are also supported by alterations in material texture,which influence dislocation dynamics as indicated by changes in Kernel Average Misorientation(KAM)values.The combined effect of grain boundary(GB)strengthening,phase distribution,and texture modification elucidates the observed mechanical enhancements.This research provides valuable insights into the design and optimization of Mg-Gd-Y-Zn-Zr alloys for critical applications in aerospace and automotive industries where high strength and ductility are paramount. 展开更多
关键词 Mg-Re alloys Microstructural evolution Mechanical property Advanced processing techniques
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