ECAP对粉末冶金ZK60镁合金组织和性能的影响  

Effect of ECAP on Microstructure and Mechanical Properties of ZK60 Alloy Prepared by Powder Metallurgy

作　　者：陈春朴 马国俊[1] 金培鹏[1] 王金辉[1] 

机构地区：[1]青海大学机械工程学院新型轻合金重点实验室

出　　处：《特种铸造及有色合金》2017年第2期197-200,共4页Special Casting & Nonferrous Alloys

基　　金：青海省科技厅基础研究项目(2015-ZJ-736);教育部春晖计划资助项目(Z2015035)

摘　　要：采用粉末冶金法制备了ZK60镁合金,对挤压态镁合金在不同温度和道次下进行了ECAP处理,研究了不同温度和道次对材料微观组织和性能的影响。结果表明,较高温度条件下能够实现镁合金棒材的等径角挤压,且在挤压温度为260℃时,材料的抗拉强度和伸长率达到最佳值。进一步在此温度下进行不同道次的等径角挤压后发现,合金的晶粒尺寸明显细化,材料的性能进一步得到改善,抗拉强度和伸长率分别达到341.5 MPa和29.3%。研究表明,合适的等径角挤压温度和不同的道次能够改善粉末冶金法制备的镁合金的力学性能。The ZK60 Mg alloys were fabricated by powder metallurgy,and then subjected to equal channel angular pressing at varied temperature and passes.Effects of pressing temperatures and passes on mechanical properties and microstructure of Mg alloys were investigated.The results reveal that the ECAP processing of the ZK60 can be realized at a higher temperature,and tensile strength and elongation of the ZK60 alloy exhibit desirable at 260 ℃.An equiaxed ultra-fine grained structure with the mean grain size less than 10μm can be observed after three passes at 260℃,and the tensile strength and elongation of the extruded alloys reach 341.5MPa and 29.3%,respectively.The results show that the appropriate pressing temperature and passes are beneficial to improving mechanical properties of ZK60 alloys.

关 键 词：镁合金 ECAP 粉末冶金 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.1[金属学及工艺—金属材料]