热处理对挤压镁合金AZ91和ZK60组织与性能的影响  

Effects of Heat Treatment on Mechanical Properties and Microstructures of As-extruded AZ91 and ZK60 Magnesium Alloys

作　　者：严琦琦[1] 张辉[1] 陈振华[1] 

机构地区：[1]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《金属热处理》2006年第11期71-74,共4页Heat Treatment of Metals

基　　金：湖南省重大专项计划项目(04GK1008-1)

摘　　要：通过力学性能测定以及金相显微组织观察,对挤压态AZ91和ZK60镁合金的热处理工艺进行了研究。结果表明,AZ91合金固溶态与挤压态相比抗拉强度变化不大,但伸长率有较大幅度的提高;时效硬度峰值时的抗拉强度与固溶态相比有一定的提高,但伸长率有较大幅度的降低。ZK60合金固溶态与挤压态相比抗拉强度和伸长率均有相当程度地降低,且时效硬度峰值时的抗拉强度与固溶态相比有一定的提高,伸长率也有较大幅度的降低。AZ91合金固溶处理后晶粒尺寸与挤压态相比有所增大,但ZK60合金固溶处理后晶粒尺寸显著粗化。同时,两种合金固溶时效处理后伴有强化相粒子析出。The effects of heat treatment on the as-extruded AZ91 and ZK60 magnesium alloys were studied by mechanical properties test and metallographic observation. The results show that the ductility is significantly enhanced under solution state of the as-extruded AZ91 alloy, in contrast, the ductility and tensile strength of as-extruded ZK60 alloy are reduced after solution treatmentand the hardness and tensile strength of these alloys are significantly enhanced by the special combination of solution and artificial aging treatment. The grain sizes of the as-extruded alloys are coarsened and the fine particles precipitate during solution and artificial aging treatment.

关 键 词：变形镁合金 挤压 热处理 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]