2219铝合金热压缩时的流变应力本构方程  

Flow Stress Constitutive Equation of 2219 Aluminum Alloy During Hot Compression

作　　者：易兆祥 李新和 常士武[1] 曹权 YI Zhaoxiang;LI Xinhe;CHANG Shiwu;CAO Quan(Light Alloy Research Institute;State Key Laboratory of High Performance and Complex Manufacturing, Central South University, Changsha 410083,China)

机构地区：[1]中南大学轻合金研究院,长沙410083 [2]中南大学高性能复杂制造国家重点实验室,长沙410083

出　　处：《机械工程材料》2018年第7期53-56,共4页Materials For Mechanical Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2014CB046600)

摘　　要：采用Gleeble-3180型热模拟试验机对2219铝合金进行单道次热压缩试验,研究了该铝合金在温度为200~350℃、应变速率为0.1~10.0s-1条件下的流变行为,建立了2219铝合金热压缩时的流变应力本构方程,并进行了试验验证。结果表明:2219铝合金的流变应力随应变速率的增大或变形温度的降低而增加;由Fields-Backofen本构方程计算得到的2219铝合金应力的变化规律与试验得到的相同,且应力计算值与试验值的相对误差小于5%,该本构方程可以较准确地描述2219铝合金的高温流变行为。The flow behavior of 2219 aluminium alloy was studied by single pass hot compression at the temperatures of 200-350 ℃and strain rates of 0.1-10.0 s-1 with Gleeble-3180 thermal mechanical simulator.The flow stress constitutive equation of 2219 aluminum alloy during hot compression was established and verified by experiments.The results show that the flow stress of 2219 aluminum alloy increased with the increase of strain rate or the decrease of deformation temperature.The change rule of stress calculated by Fields-Backofen constitutive equation was the same with that by experiments,and the relative error between calculated and tested stresses was less than 5%.The constitutive equation described the high temperature flow behavior of 2219 aluminium alloy accurately.

关 键 词：铝合金 热压缩 流变应力 本构方程 

分 类 号：TG306[金属学及工艺—金属压力加工]