预置初始孪晶对ECAP变形纯镁组织和性能的影响  

Effect of Pre-Initial twins on Microstructure and Propertiesof ECAP Deformed Pure Magnesium

作　　者：任开志 张征勇 鲁晔 王利飞[1] 曹晓卿[1] REN Kaizhi;ZHANG Zhengyong;LU Ye;WANG Lifei;CAO Xiaoqing(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学材料科学与工程学院,山西太原030024

出　　处：《热加工工艺》2023年第7期94-96,共3页Hot Working Technology

基　　金：国家自然科学基金项目(51704209,U1810208,U1810122);山西省国际合作项目(201803D421086);山西省专利实施推广专项项目(20200718);山西省高等学校技术创新计划项目(201802034);山西省科学设施与仪器共享镁基材料电脉冲辅助成形服务平台项目(201805D141005);山西省自然科学基金项目(201901D111104);山西省科技重大专项项目(20191102008,20191102007,20181101008)。

摘　　要：对预置孪晶后的纯镁进行等通道挤压(ECAP),利用光学显微镜、电子万能试验机研究1、2、4道次后组织和力学性能的变化。结果表明在250℃等通道挤压下,预压缩5%的试样比原始试样具有更细的晶粒。2道次挤压后,预孪晶的样品相较于没有预压缩的样品动态再结晶晶粒更多。4道次挤压后晶粒尺寸变得更加均匀。ECAP和预孪晶均能提高纯镁的伸长率。预孪晶4道次挤压后样品的伸长率比原始样品挤压的伸长率提高较大,说明了孪晶在纯镁ECAP变形中起着重要的作用。The pre-twinned pure magnesium was subjected to equal channel extrusion(ECAP).Optical microscope and electronic universal testing machine were used to study the changes of structure and mechanical properties after 1,2,and 4 passes.The results show that the 5%pre-compressed sample has finer grains than the original sample under ECAP at 250℃.After two passes of extrusion,the pre-twinned sample has more dynamic recrystallized grains than the uncompressed sample.The grain size becomes more uniform after 4 passes of extrusion.ECAP and pre-twinning can increase the elongation of pure magnesium.Compared with that of the original sample,the elongation of the pre-twinned sample after 4-pass extrusion is increased significantly,which shows that twins play an important role in ECAP deformation of the pure magnesium.

关 键 词：纯镁 预置孪晶 等通道挤压 动态再结晶 

分 类 号：TG379[金属学及工艺—金属压力加工]