预置粒子对ZM6镁合金热变形组织及力学性能的影响  

Effects of pre-existing particle on microstructural and mechanical properties of ZM6 magnesium alloy under hot compression

作　　者：张至柔[1] 长海博文 杨续跃[1] ZHANG Zhi-rou;NAGAUMI Hiromi;YANG Xu-yue(School of Materials Science and Engineering,Central South University,Changsha 410083,China;School of Iron and Steel,Soochow University,Suzhou 215100,China)

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]苏州大学沙钢钢铁学院,苏州215006

出　　处：《中国有色金属学报》2022年第6期1579-1590,共12页The Chinese Journal of Nonferrous Metals

基　　金：国家重点研发计划资助项目(2021YFB3701100,2022YFE0109600);国家自然科学基金资助项目(52071344,U1864209)。

摘　　要：采用光学显微镜(OM)、扫描电子显微镜(SEM)、电子背散射衍射技术(EBSD)、透射电子显微镜(TEM)等分析预置粒子对ZM6镁合金热压缩过程中显微结构的影响,并在室温下进行室温力学性能测试。结果表明:预置粒子能够有效促进热变形过程中的动态再结晶行为,热压缩后合金组织细化、织构弱化,抗拉强度和伸长率都显著提升。和固溶态样品相比,预置粒子样品在510℃下再结晶体积分数由85%提升至100%,在不损害强度的前提下,伸长率提升至18.2%,提升了30%。The effects of pre-existing particles on the microstructure of a ZM6 magnesium alloy during hot deformation were investigated by optical microscopy(OM),scanning electron microscopy(SEM),back-scattering diffractometry(EBSD),and transmission electron microscopy(TEM).The mechanical properties were detected through tensile tests at room temperature.The results show that dynamic recrystallization(DRX)is remarkably promoted during compression by the pre-existing particles.Accordingly,obvious grain refinement and basal texture weakening are observed after compression,resulting in improvement of ultimate tensile strength and elongation.Compared with the sample without pre-existing particles,the volume fraction of dynamic recrystallization increases from 85%to almost 100%,and the elongation of compressed sample with pre-existing particle treatment increases by 30%,reaching a maximum of 18.2%,without any drop in strength.

关 键 词：ZM6镁合金 预置粒子 热压缩 动态再结晶 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]