Ti-5Mo-5V-2Cr-3Al合金热压缩变形行为  

Hot Compressive Behavior of Ti-5Mo-5V-2Cr-3Al Alloy

作　　者：魏衍广[1] 陶海明[1] 陈海珊[1] 

机构地区：[1]北京有色金属研究总院粉末冶金及特种材料研究所,北京100088

出　　处：《稀有金属》2011年第3期349-355,共7页Chinese Journal of Rare Metals

基　　金：中国博士后科学基金(20080440334)资助项目

摘　　要：对Ti-5Mo-5V-2C r-3A l钛合金进行等温压缩实验,变形温度范围为923~1123 K,应变速率为0.001~1 s-1。分析表明该材料的流变应力对温度与应变速率敏感：当变形温度为923~1023 K时,流变应力曲线呈现动态再结晶曲线特征;当变形温度为1073 K时,低应变速率（0.001 s-1）的流变应力曲线呈现动态再结晶曲线特征,高应变速率（0.01~1 s-1）的流变应力曲线呈现动态回复曲线特征;当变形温度为1123 K时,流变应力曲线呈现动态回复曲线特征;峰值流变应力随着变形温度的升高而下降,且下降速率随着温度升高而降低;峰值流变应力随着应变速率的升高而升高,升高速率在923~1023 K范围内随着应变速率升高而下降,在1073 K时随着应变速率升高而升高,在1123 K时随着应变速率升高无变化。Ti-5Mo-5V-2C r-3A l钛合金在等温压缩变形时的流变行为可用包含Zener-Holomon参数的Arrhen ius本构方程描述,变形激活能为789 k.Jmol-1。Isothermal compression test of Ti-5Mo-5V-2Cr-3Al alloy was carried out with the temperature range of 923~1123 K and the strain rate range of 0.001~1 s-1.The results showed that flow stress was sensitive to deformation temperature and strain rates.Dynamic recrystallization occurred in the temperature range of 923~1023 K.When the temperature was 1073 K,dynamic recrystallization occurred at a strain rate of 0.001 s-1,and dynamic recovery occurred in the strain rate range of 0.01~1 s-1.Dynamic recovery occurred on 1123 K.The maximum flow stress decreased with the increase of the temperature,furthermore,the reduction speed decreased with the increase of the temperature.The maximum flow stress increased with the increase of strain rates,furthermore,the increasing speed decreased in the range of 923~1023 K,increased at 1073 K,unchanged from 1123 K on with the increase of strain rates.The flow stress behaviors of Ti-5Mo-5V-2Cr-3Al alloy during isothermal compression could be expressed by Arrhenius constitutive equation including Zener-Holomon parameters.The hot deformation activation energy was 789 kJ · mol-1.

关 键 词：Ti-5Mo-5V-2Cr-3Al合金 等温压缩 本构方程 流变应力 

分 类 号：TG146.23[一般工业技术—材料科学与工程]