Mg-13Gd-4Y-2Zn-0.5Zr稀土镁合金多道次挤压微观组织演变与力学性能  

Microstructure evolution and mechanical performance of multi-pass extrusion for Mg-13Gd-4Y-2Zn-0.5Zr rare earth magnesium alloy

作　　者：穆崇礼 徐健[1] 杨亚琴[1] 刘芸芳 赵毅慧 张治民[1] MU Chong-li;XU Jian;YANG Ya-qin;LIU Yun-fang;ZHAO Yi-hui;ZHANG Zhi-min(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Inner Mongolia First Machinery Group Corporation,Baotou 014000,China)

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]内蒙古第一机械集团股份有限公司,内蒙古包头014000

出　　处：《塑性工程学报》2022年第1期133-139,共7页Journal of Plasticity Engineering

基　　金：国防基础科研项目(JCKY2018408B003)。

摘　　要：为探究异形箱体在成形过程中加热次数对材料的影响,以Mg-13Gd-4Y-2Zn-0.5Zr大塑性变形稀土镁合金为原料,进行杯形件单道次和等温多道次成形试验,并采用光学显微镜、扫描电子显微镜和X射线衍射仪和万能材料试验机等检测手段分析各个变形过程中合金微观组织和力学性能的变化。结果表明:经过单道次成形的杯形件晶粒尺寸较小且LPSO相分布均匀,对位错运动起到了较强的阻碍作用。且该合金的极限抗拉强度、拉伸屈服强度及伸长率都达到最大值,分别为272.64 MPa、160.03 MPa和8.3%,综合力学性能较高。To explore the influence of heating times on the material during the forming of the special-shaped box,the single pass and isothermal multi-pass forming experiments of cup-shaped parts were carried out based on Mg-13 Gd-4 Y-2 Zn-0.5 Zr large plastic deformed rare earth magnesium alloy.Optical microscope(OM),scanning electron microscope(SEM),X-ray diffractometer(XRD) and universal material testing machine were used to analyze the changes of alloy microstructure and mechanical properties during each deformation process.The results show that the grain size of cup-shaped parts formed by single pass is small and the distribution of LPSO phase is uniform,which strongly hinder the dislocation movement.The ultimate tensile strength,tensile yield strength and elongation of the alloy reach the maximum,which is 272.64 MPa,160.03 MPa and 8.3% respectively,indicating high comprehensive mechanical properties.

关 键 词：挤压成形 异形箱体 Mg-13Gd-4Y-2Zn-0.5Zr 杯形件 微观组织 力学性能 

分 类 号：TG376[金属学及工艺—金属压力加工]