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材料科学技术（英文版）
材料科学技术（英文版）

胡壮麟

月刊

1005-0302

jmst@imr.ac.cn

024-83978208

110016

沈阳市沈河区文化路72号

材料科学技术（英文版）/Journal Journal of Materials Science & TechnologyCSCDCSTPCD北大核心EISCI
查看更多>>本刊简称《JMST》，（ISSN 1005-0302，CN 21-1315/TG）。1985年创刊。是中国科协主管，中国金属学会，中国材料研究学会和中国科学院金属研究所联合主办的国际性英文期刊，以“加强国际交流，扩大学术影响，服务经济建设”为办刊宗旨，刊登世界各国的具有创新性和较高学术水平的原始性论文，并设有物约综述、快报、简讯及国内外材料界杰出学者简介等栏目，内容包括金属材料、无机非金属材料、复合材料及有机高分子材料等。
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    Reactive sintering of dual-phase high-entropy ceramics with superior mechanical properties

    Sijia HuoLei ChenXinrui LiuQingyi Kong...
    223-227页
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    Anisotropy study of the microstructure and properties of AlCoCrFeNi2.1 eutectic high entropy alloy additively manufactured by selective laser melting

    Liwei LanWenxian WangZeqin CuiXiaohu Hao...
    228-239页
    查看更多>>摘要：The AlCoCrFeNi2.1 eutectic high-entropy alloy(EHEA)was prepared by selective laser melting(SLM),fo-cusing on the anisotropy of microstructure and mechanical performance.The AlCoCrFeNi2.1 EHEA printed by SLM has face-centered cubic(FCC)and body-centered cubic(BCC)/B2 phases,and the FCC phase accu-mulates at the boundary of the molten pool.With the increase in volumetric energy density(VED),the content of the FCC phase parallel to the surface in the direction of the building increases from 30.9％to 41％.The X-Z plane mainly produces columnar crystals along the temperature gradient,while a large number of equiaxed crystals are produced in the X-Y direction.When the volume energy density is 157 kJ/mol(VED 157),the average grain size is 1.33 μm for BCC and 1.14 μm for FCC,which is signif-icantly smaller than other preparation methods.Due to defect distribution and size,the microhardness of the X-Y plane is generally higher than that of the X-Z plane,with maximum hardnesses of 660 HV and 655 HV,respectively,which is much higher than those of traditionally manufactured counterparts.The compression performance of SLM process AlCoCrFeNi2.1 EHEAs shows maximum yield strength of 1567 MPa,and the ultimate compressive strength can reach 3276 MPa.
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    Ultrafine grained metastable Ti6Al4V5Cu alloy with high strength and excellent low-cycle fatigue property

    Wei SongHai WangYi LiShuyuan Zhang...
    240-250页
    查看更多>>摘要：The insufficient low-cycle fatigue properties of titanium alloys under cyclic heavy loading are regarded as a challenge for their security in service.In recent years,a large number of studies have found that the transformation induced plasticity(TRIP)effect could hinder the propagation of fatigue cracks,which significantly improved the low-cycle fatigue properties of titanium alloys.However,the coarse β-phase grains and the soft phase transformation product α"phase in TRIP titanium alloys impair their tensile strength,which restrict their applications in engineering.To this end,a Ti6Al4V5Cu alloy with TRIP ef-fect was developed in this work.It was proposed to use the mutual restraint between the α and βphases in the material to refine the grains,and through composition optimization,the phase transforma-tion product would be the α'phase,which has a higher strength than the α''phase.Thus,the strength of the Ti6Al4V5Cu alloy can be improved.The results showed that the tensile strength and elongation of the TRIP Ti6Al4V5Cu alloy was 1286 MPa and 22％,which was 23.7％and 46.7％higher than that of the traditional Ti6Al4V alloy,respectively.Besides,under the same strain amplitude,the fatigue life of the Ti6Al4V5Cu alloy was 2-5 times longer than that of the Ti6Al4V alloy.Furthermore,we clarified the mechanisms of improving the tensile strength and fatigue properties of the Ti6Al4V5Cu alloy,which would lay a research foundation for the development of high-performance titanium alloys.
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    Strengthening of high-entropy alloys via modulation of cryo-pre-straining-induced defects

    Daixiu WeiWu GongLiqiang WangBowen Tang...
    251-260页
    查看更多>>摘要：Owing to their attractive structure and mechanical properties,high-entropy alloys(HEAs)and medium-entropy alloys(MEAs)have attracted considerable research interest.The strength of HEAs/MEAs with a single face-centered cubic(FCC)phase,on the other hand,requires improvement.Therefore,in this study,we demonstrate a strategy for increasing the room-temperature strength of FCC-phase HEAs/MEAs by tuning cryo-pre-straining-induced crystal defects via the temperature-dependent stacking fault energy-regulated plasticity mechanism.Through neutron diffraction line profile analysis and electron micro-scope observation,the effect of the tuned defects on the tensile strength was clarified.Due to the cryo-rolling-induced high dislocation density,mechanical twins,and stacking faults,the room-temperature yield strength of an equiatomic CoCrFeNi HEA was increased by～290％,from 243 MPa(as-recrystallized)to 941.6 MPa(30％cryo-rolled),while maintaining a tensile elongation of 18％.After partial recovery via heat treatment,the yield strength and ultimate tensile strength decreased slightly to 869 and 936 MPa,respectively.Conversely,the elongation increased to 25.6％.The dislocation density and distribution of the dislocations were found to contribute to the strengthening caused by forest dislocations,which warrants further investigation.This study discussed the possibility of developing single-phase high-performance HEAs by tuning pre-straining-induced crystal defects.
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