铸态Mg-6Zn合金的半固态压缩变形行为及本构模型的建立  

Semi-solid Compression Deformation Behavior and Constitutive Model Establishment of As-cast Mg-6Zn Alloy

作　　者：蔡晓文[1] 任俊 罗霞 CAI Xiaowen;REN Jun;LUO Xia(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Pangang Group Research Institute Co.,Ltd.,Chengdu 610305,China;School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]攀钢集团研究院有限公司,钒钛资源综合利用国家重点实验室,成都610305 [2]西南石油大学新能源与材料学院,成都610500

出　　处：《机械工程材料》2024年第5期38-44,共7页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51704255)。

摘　　要：利用Gleeble-3500型热力模拟试验机对铸态Mg-6Zn合金在变形温度500,520,540℃,应变速率0.1,1,5 s^(-1)下进行半固态压缩试验,得到了真应力-真应变曲线;基于真应力和真应变试验数据及Arrhenius模型,建立该合金的半固态压缩本构模型,并进行试验验证。结果表明:Mg-6Zn合金的半固态压缩变形过程主要分为类弹性变形、应变硬化变形和流变黏塑性变形3个阶段;峰值应力随变形温度的升高或应变速率的减小而降低。利用建立的本构模型计算得到的真应力与试验结果之间的相关性很好,相关系数为0.947,平均相对误差为5.57%,说明该本构模型能够较准确地预测铸态Mg-6Zn合金的半固态压缩变形行为。The semi-solid compression tests at deformation temperatures of 500,520,540℃and strain rates of 0.1,1,5 s^(-1) were conducted on as-cast Mg-6Zn alloy by Gleeble-3500 thermal simulator.The true stress-true strain curves were obtained.The semi-solid compression constitutive model was established based on the true stress and true strain test data and Arrhenius model,and was verified by tests.The results show that the semi-solid compression deformation of Mg-6Zn alloy was divided into three stages of quasi-elastic deformation,strain hardening deformation and rheo-viscoplastic deformation.The peak stress decreased with the increase of deformation temperature or the decrease of strain rate.The correlation between the calculated values by the constitutive model and the test results of true stress was very good with the correlation coefficient of 0.947 and the average relative error of 5.57%,which indicated that the constitutive model could accurately predict the semi-solid compression deformation behavior of the as-cast Mg-6Zn alloy.

关 键 词：Mg-6Zn合金 半固态压缩变形 真应力-真应变曲线 本构模型 

分 类 号：TF125.1[冶金工程—粉末冶金]