等通道转角挤压对真空吸铸成形纯铝力学性能及微观组织的影响  

Influence of equal channel angular pressing on mechanical properties and microstructure for pure aluminum formed by vacuum suction casting

作　　者：李健 何涛 贾东昇 霍元明 张俊杰 陈细林 Li Jian;He Tao;Jia Dongsheng;Huo Yuanming;Zhang Junjie;Chen Xilin(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620

出　　处：《锻压技术》2023年第11期60-66,共7页Forging & Stamping Technology

基　　金：国家自然科学基金资助项目(52275350);上海市自然科学基金资助项目(20ZR1422100)。

摘　　要：探究了等通道转角挤压(Equal Channel Angular Pressing,ECAP)对真空吸铸成形纯铝的力学性能和微观组织影响,利用显微硬度测试、室温拉伸实验和光学显微镜,研究了真空吸铸成形纯铝经ECAP前后的力学性能和微观组织形貌。结果表明:经过等通道转角挤压后,真空吸铸成形纯铝使变形前的细小晶粒继续被拉长细化,平均晶粒尺寸由31μm细化为24μm,并且晶粒细化更加均匀;真空吸铸成形纯铝的硬度和抗拉强度分别为26.6 HV和72.1 MPa,经ECAP强化后达到了41.6 HV和113.2 MPa,分别提升了56.5%和57.0%,且综合力学性能更优。In order to explore the influences of equal channel angular pressing(ECAP)on the mechanical properties and microstructure of pure aluminum formed by vacuum suction casting,the mechanical properties and microstructure morphology of pure aluminum formed by vacuum suction casting before and after ECAP were studied by microhardness testing,room temperature tensile testing and optical microscope.The results show that after ECAP,the vacuum suction casting make the fine grain of pure aluminum continue to be elongated and refined.The average grain size is refined from 31μm to 24μm,and the grain refinement is more uniform.The hardness and tensile strength of pure aluminum formed by vacuum suction casting are 26.6 HV and 72.1 MPa respectively,and after ECAP strengthening,they reach 41.6 HV and 113.2 MPa,which are increased by 56.5% and 57.0% respectively.Moreover,the comprehensive mechanical properties are better.

关 键 词：真空吸铸 等通道转角挤压 纯铝 力学性能 微观组织 

分 类 号：TG376[金属学及工艺—金属压力加工]