2195铝锂合金多道次热变形流变应力的模拟研究  

Simulation on Flow Stress of Multi-Pass Hot Deformation of 2195 Al-Li Alloy

作　　者：蒋呐[1] 李劲风[1] 郑子樵[1] 任文达[1] 韩冬峰[1] 

机构地区：[1]中南大学

出　　处：《稀有金属材料与工程》2007年第6期949-953,共5页Rare Metal Materials and Engineering

基　　金：国家'十五'重点攻关项目(MKPT-01-130(2D))资助

摘　　要：采用G1eeble-1500热模拟实验机，对2195铝锂合金变形温度为360～520℃，应变速率为0．001-1．0s^-1的单道次热压缩及变形温度为320℃和360℃，应变速率为0．1s^-1，道次间隔时间30-180s的双道次热压缩的流变应力及静态软化规律进行了模拟研究。通过对幂指数应力函数中系数A和β与应变关系的分析，以及采用平均软化法考虑前一道次变形的残余应变对后一道次变形的影响，建立了2195铝锂合金多道次热变形的流变应力方程。The flow stress of 2195 A1-Li alloy has been studied during one-pass hot deformation in the strain rate range of 0.001 s^-1 to 1.0 s^-1 and the temperature range of 360 ℃ to 520℃ by using Gleeble-1500 hot simulator. The flow stress and static softening behaviors have been investigated during multi-pass hot deformation by isothermal interrupted hot compression. The values of lnA and β have been analyzed as the strain functions in the stress function of power exponent. A modified exponential flow stress model of 2195 Al-Li alloy during multi-pass deformation has been established by using uniform softening method and considering the effects of residual strain during multi-pass hot deformation.

关 键 词：2195铝锂合金 多道次热变形 流变应力 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG115.6[金属学及工艺—金属材料]