摘要
WE43镁合金在航空航天、生物医学及交通运输领域展现出显著的应用潜力,激光粉末床熔融技术为实现其性能优化提供了新途径。然而,该工艺制备的镁合金构件常因微观结构的各向异性导致其力学性能的提升被制约。系统研究了不同沉积方向对激光粉末床熔融制备的WE43镁合金组织和性能演变的影响。结果表明,机械性能的各向异性与沉积方向有关。首先,垂直沉积试样内平均尺寸1.86μm的晶粒具有细晶强化效应;其次,高密度的低角度晶界对位错运动的阻滞作用;最后,当垂直试样沿构建方向承受拉伸载荷时,LPBF制备的WE43合金会受到与现有裂纹平行的应力,进一步提高机械性能。因此,垂直沉积试样的拉伸性能优于水平沉积试样,屈服强度达到282 MPa、极限拉伸强度达到325 MPa、伸长率达到12%。该研究为LPBF沉积策略的优化提供了理论依据,为实现WE43镁合金微观结构与性能的定向设计奠定了技术基础。
WE43 magnesium alloys exhibit significant potential for applications in aerospace,biomedical,and transportation fields.Laser powder bed fusion(LPBF)technology offers a novel approach to optimize their properties.However,the mechanical performance of magnesium alloys produced via this method is often limited by the anisotropy of their microstructure.In this study,the effects of different deposition orientations on the microstructural evolution and mechanical properties of LPBF-fabricated WE43 magnesium alloys were systematically investigated.The results indicate that the anisotropy in mechanical behavior is closely related to the deposition direction.Specifically,the vertically deposited specimens exhibit an average grain size of 1.86μm,contributing to a finegrain strengthening effect.In addition,the high density of low-angle grain boundaries hinders dislocation motion,further enhancing mechanical strength.Moreover,under tensile loading along the build direction,the orientation of existing cracks becomes parallel to the applied stress,thereby reducing crack propagation and improving tensile performance.As a result,vertically deposited specimens demonstrate superior tensile properties compared to the horizontally deposited counterparts,with a yield strength of 282 MPa,an ultimate tensile strength of 325 MPa,and an elongation of 12%.This study provides a theoretical basis for optimizing LPBF deposition strategies and lays a technical foundation for the directional design of microstructure and properties in WE43 magnesium alloys.
作者
陈雯
李坤
尹浜兆
廖若冰
李奔向
黄焕杰
吴英杰
温鹏
蒋斌
潘复生
CHEN Wen;LI Kun;YIN Bangzhao;LIAO Ruobing;LI Benxiang;HUANG Huanjie;WU Yingjie;WEN Peng;JIANG Bin;PAN Fusheng(State Key Laboratory of Mechanical Transmission for Advanced Equipment,Chongqing University,Chongqing 400044,China;Chongqing Key Laboratory of High Performance Structural Additive Manufacturing,Chongqing University,Chongqing,400044,China;College of Mechanical and Vehicle Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment,Department of Mechanical Engineering,Tsinghua University,Beijing 100084,China;Department of Materials Science and Engineering,Sichuan University–Pittsburgh Institute(SCUPI),Sichuan University,Chengdu 610207,China;National Engineering Research Center for Magnesium Alloys,Chongqing 400044,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)
出处
《粉末冶金工业》
北大核心
2025年第4期81-91,共11页
Powder Metallurgy Industry
基金
国家自然科学基金资助项目(52201105)。
