2219铝合金热压缩流变应力及本构方程  

Flow stress and constitutive equation of 2219 aluminum alloy under hot compression

作　　者：侯深圳 蔡玉俊[1] 董晓传[1] 潘高峰[2] HOU Shen-zhen;CAI Yu-jun;DONG Xiao-chuan;PAN Gao-feng(National-Local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die&Mould,Tianjin University of Technology&Education,Tianjin 300222,China;Tianjin Tianduan Press Co.,Ltd.,Tianjin 300402,China)

机构地区：[1]天津职业技术师范大学汽车模具智能制造技术国家地方联合工程实验室,天津300222 [2]天津市天锻压力机有限公司,天津300402

出　　处：《塑性工程学报》2022年第12期135-141,共7页Journal of Plasticity Engineering

基　　金：天津市教委科研计划(2021KJ027);天津市科技计划(20YDTPJC00310);天津职业技术师范大学科研发展基金资助项目(XJJB2102)。

摘　　要：为研究2219铝合金的热变形行为,采用THERMECMASTOR型热模拟试验机,在温度380~460℃,应变速率0.01~10 s^(-1)条件下进行了热压缩实验,获得了2219铝合金的真实应力-真实应变曲线。结果表明,变形温度和应变速率对2219铝合金流变应力有重大影响。在相同应变速率条件下,随着变形温度的升高,流变应力逐渐减小;在相同变形温度条件下,随着应变速率的增大,流变应力不断增大。为准确描述流变应力与变形温度和应变速率之间的关系,对2219铝合金热压缩获得的实验数据进行拟合,建立了基于应变补偿的双曲正弦本构方程。通过准确度的计算,得到实验值与预测值的绝对误差为4.78%,表明该本构方程能够较好地预测高温下2219铝合金的流变行为。To study the thermal deformation behaviors of 2219 aluminum alloy,the hot compression experiment was conducted at temperature of 380-460℃and strain rate of 0.01-10 s^(-1) by THERMECMASTOR thermal simulator,and the true stress-true strain curves of 2219 aluminum alloy were obtained.The results show that the deformation temperature and strain rate have a significant effect on the flow stress of 2219 aluminum alloy.Under the same strain rate condition,with the increase of the deformation temperature,the flow stress gradually decreases;under the same deformation temperature condition,with the increase of the strain rate,the flow stress increases.To accurately describe the relationship between flow stress and deformation temperature and strain rate,the experimental data obtained by hot compression of 2219 aluminum alloy was fitted,and a hyperbolic sine constitutive equation based on strain compensation was established.Through the calculation of accuracy,the absolute error between the experimental values and the predicted values is 4.78%,indicating that the constitutive equation can better predict the rheological behavior of 2219 aluminum alloy at high temperature.

关 键 词：2219铝合金 热变形行为 流变应力 本构方程 

分 类 号：TG115.5[金属学及工艺—物理冶金]