Mg-10Gd-4.8Y-2Zn-0.6Zr合金本构方程模型及加工图  

Constitutive equation model and processing map for Mg-10Gd-4.8Y-2Zn-0.6Zr alloy

作　　者：李慧中[1,2] 王海军[1] 刘楚明[1] 刘洪挺[1] 郭菲菲[1] 梁霄鹏[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083

出　　处：《材料热处理学报》2010年第7期88-93,共6页Transactions of Materials and Heat Treatment

基　　金：中国博士后基金资助项目(200704200828);中南大学博士后基金资助项目(2007-8)

摘　　要：采用Gleeble-1500热模拟实验机在温度为623～773 K,应变速率为0.001～1 s-1条件下对Mg-10Gd-4.8Y-2Zn-0.6Zr(wt%)合金进行热压缩实验,研究了该合金热变形行为及热加工特征,建立了该合金热变形时的本构方程和加工图。结果表明,该合金高温变形时的峰值应力随着应变速率的降低和变形温度的升高而显著减小;变形激活能为289.36 kJ/mol;合金高温变形时存在两个失稳区,分别是变形温度为770～773 K,应变速率为0.1 s-1左右的区域,和变形温度小于750 K,应变速率小于0.03s-1的区域;合金的最佳热加工温度为750～773 K,应变速率为0.001～0.01 s-1。Hot-compression tests of Mg-10Gd-4.8Y-2Zn-0.6Zr（wt%） alloy was carried out at 623-773 K and strain rates of 0.001-1 s-1 on a hot-simulation machine Gleeble-1500.The deformation behavior and hot workability of the alloy was studied and the constitutive equation and processing map were established on the basis of experiment.The results show that the peak stress for hot deformation decreases remarkably with the decreasing of strain rate and increasing of deformation temperature.The average activation energy is 289.36 kJ /mol.According to the processing map,two unstable zones of high temperature deformation of the alloy appeares,which is the zone at the deformation temperature of 750-773 K with the strain rate of 0.1 s-1,and the zone at deformation temperature below 750 K with the strain rate below 0.03 s-1.The hot deformation at the deformation temperature of 750-773 K with the deformation rates of 0.001-0.01 s-1 is recommended for Mg-10Gd-4.8Y-2Zn-0.6Zr alloy.

关 键 词：Mg-10Gd-4.8Y-2Zn-0.6Zr合金 变形激活能 本构方程 加工图 组织 

分 类 号：TG113.26[金属学及工艺—物理冶金]