Zn-10Al-2Cu合金高温热压缩流变行为研究  

Flow Behavior of Zn-10Al-2Cu Alloy During Hot Compression at Elevated Temperature

作　　者：陈业高[1] 王力强[1] 尹建成[1] 刘英莉[2] 杨环[1] 刘丽娜[1] 孙淑红[1] 钟毅[1] 

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]昆明理工大学信息科学与自动化学院,昆明650093

出　　处：《材料导报（纳米与新材料专辑）》2016年第1期483-486,504,共5页

基　　金：国家自然科学基金(50874055)

摘　　要：采用Gleeble-3800热模拟试验机对Zn-10Al-2Cu合金在变形温度为150~330℃、变形速率为0.01~10s-1条件下的流变行为进行研究。结果表明：Zn-10Al-2Cu合金在热压缩变形中,当应变速率一定时,流变应力随变形温度的升高而减小;而当变形温度一定时,流变应力随着变形速率的增大而增大,达到峰值后下降趋势平缓。Zn-10Al-2Cu合金的热压缩流变行为可用双曲正弦形式的本构方程来描述。在本实验条件下,该锌铝铜合金热变形应力指数n为5.4、热变形激活能Q为137kJ/mol,高温流变应力用含Zener-Hollomon参数的Arrhenius方程描述为：σ=123ln{（Z/（1.22×1013））1/5.4＋[（Z/（1.22×1013））2/5.4＋1]1/2}。Hot compression tests of Zn-10Al-2Cu alloy were conducted on Gleeble-3800 at strain rates between0.01-10s-1 and deformation temperatures of 150~330 ℃.The results showed that the flow stress increases with increasing the strain rate at the constant temperature,however,decreases with increasing the deformation temperature at the constant strain rate during the hot compression tests of Zn-10Al-2Cu alloy.Besides,the flow stress declines gently after reaching maximum.It indicates that during the hot compression,the peak value of flow stress of this alloy could be depicted by the hyperbolic-sine mathematical model preferably.The hot deformation activation energy Qderived from the experimental data is 137kJ/mol with stress exponent n=5.4.The flow stress of Zn-10Al-2Cu during the high temperature deformation process can be represented by the Arrhenius equation including Zparameter：σ =123ln{（Z/（1.22×1013））1/5.4＋ [（Z/（1.22×1013））2/5.4＋1]1/2}.

关 键 词：Zn-10Al-2Cu合金 流变应力 热压缩变形 ZENER-HOLLOMON参数 热变形激活能 

分 类 号：TG146[一般工业技术—材料科学与工程]