【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%。更多还原

【Abstract】 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 σb of 310 MPa,σ0.2 of 290 MPa,and δ of 16%.更多还原