Mg-5.52Zn-1.73Nd-0.71Cd-0.5Zr镁合金的热变形组织和力学性能  

Hot-compression deformation microstructure and mechanical properties of Mg-5.52Zn1.73Nd-0.71Cd-0.5Zr magnesium alloy

作　　者：刘先兰[1,2] 刘楚明[1] 张文玉[2] 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,长沙410083 [2]湖南工学院机械系,衡阳421002

出　　处：《粉末冶金材料科学与工程》2011年第6期799-805,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：国防科工委项目;湖南省自然科学基金资助项目(10JJ6067);湖南省科技计划项目(2011FJ3072)

摘　　要：采用Gleeble-1500热模拟机研究Mg-Zn-Nd-Cd-Zr合金在温度为300～420℃、应变速率为0.001～1 s-1、最大变形程度为80%的条件下的高温变形行为。采用光学显微镜及透射电镜研究Mg-Zn-Nd-Cd-Zr镁合金在不同压缩变形条件下的组织形貌特征。结果表明:在实验条件下,合金的流变应力-应变曲线属于动态再结晶类型。合金的峰值流变应力随应变速率的增大而增加,随温度的升高而降低。实验分析认为该镁合金挤压温度定在340～380℃左右为宜;在360℃左右顺利挤出的实验合金有很好的力学性能。抗拉强度(σb)为310 MPa,屈服强度(σ0.2)为290 MPa,伸长率(δ)为16%。The flow stress features of Mg-Zn-Nd-Cd-Zr alloy were investigated by isothermal compression of cylindrical specimen at 300-420℃ and strain rate of 0.001-1 s-1 under maxium strain of 80%with Gleeble-1500 simulated machine. The microstructure of the experimental alloy in the hot-compression procedure at elevated temperatures was analyzed by OM （optical microscope） and TEM （transmission electron microscope）. The results show that the peak flow stress becomes larger with the increasing strain rate at constant temperature, and gets smaller with the increasing deformation temperature at constant strain rate. The alloy can be extruded successfully at 360℃ with ab of 310 MPa, σ0.2 of 290 MPa, andδ of 16%.

关 键 词：镁合金 热模拟变形 动态再结晶 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]