挤压变形对Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr合金组织和性能的影响  

Effects of Extrusion Process on Microstructure and Mechanical Properties of Mg-Nd-Zn-Zr-Cd Magnesium Alloy

作　　者：刘先兰[1,2] 刘楚明[1] 徐雷[1] 李慧中[1] 曾苏民[1] 

机构地区：[1]中南大学材料科学与工程学院 [2]湖南工学院机械系

出　　处：《特种铸造及有色合金》2010年第10期894-896,共3页Special Casting & Nonferrous Alloys

基　　金：国防科工委项目;湖南省自然科学基金资助项目(10JJ6067);衡阳市科技计划项目(2010KJ29)

摘　　要：采用光学显微镜及透射电镜研究了Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr镁合金在不同挤压变形条件下的组织和性能。结果表明,在一定的挤压条件下,当挤压温度降低或挤压比增大,晶粒变细小,合金的抗拉强度和屈服强度提高;在温度为340℃,挤压比为16时,合金抗拉强度为334MPa,屈服强度为300MPa,伸长率为13%,力学性能优良,平均晶粒直径为7μm。Microstructure and mechanical properties of Mg-5.5Zn-1.7Nd-0.7Cd-0.5Zr magnesium alloy were investigated under different extrusion rates by optical microscope(OM)and TEM(transmission electron microscope).It is revealed that at a defined extrusion condition,with decreasing in extrusion temperature or increasing in extrusion ratio,tensile strength and yield strength of the alloy are increasingly improved as a result of the refinement of grain size.Desirable mechanical properties of the alloy can be observed with extruding at 340℃and extrusion ratio of 16,where tensile strength,yield strength and elongation as well as average grain size reach 334MPa,300MPa and 13%,7 μm,respectively.

关 键 词：镁合金 热挤压变形 显微组织 力学性能 

分 类 号：TG379[金属学及工艺—金属压力加工]