热挤压镁合金AZ91的微观组织及其力学行为  

Microstructure and mechanical behavior of hot-extruded magnesium alloy AZ91

作　　者：李媛媛[1] 计海涛[1] 申健[1] 洪成淼[1] 李锋[1] 刘正[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110023

出　　处：《沈阳工业大学学报》2005年第2期151-154,共4页Journal of Shenyang University of Technology

摘　　要：研究了热挤压镁合金AZ91的微观组织以及在不同试验温度和不同的热处理条件下的拉伸力学性能.结果表明:热挤压可以显著减小AZ91合金的晶粒尺寸,其拉伸力学性能与试验温度密切相关;可以通过热处理来改善其拉伸力学性能,其中人工时效及固溶时效工艺均是改善和提高挤压后AZ91镁合金力学性能的有效途径.此外,利用扫描电镜分析了AZ91镁合金拉伸试样的断口形貌,并探讨了其拉伸断裂机制.The effects of test temperature and heat treatment on the mechanical properties of hot-extruded AZ91 alloy were studied.The results showed that hot-extruded processing could reduce grain size (significantly) and improve the mechanical properties.Artificial aging and solution plus aging could enhance the tensile properties.Moreover,by means of SEM,observations on fracture surfaces were carried out,and the mechanisms of fracture were discussed.

关 键 词：热挤压 镁合金 微观组织 力学性能 断裂机制 

分 类 号：TG146.2[一般工业技术—材料科学与工程]