7022铝合金的高温力学性能和材料本构方程研究  

Study on high temperature mechanical properties and material constitutive equation for 7022 aluminum alloy

作　　者：殷剑 黎诚 金康 沈智[3] 董奇 张波 Yin Jian;Li Cheng;Jin Kang;Shen Zhi;Dong Qi;Zhang Bo(Beijing Research Institute of Mechanical&Electrical Technology Co.,Ltd.CAM,Beijing 100083,China;China Machinery Industry Technology Research Institute of Precision Forming,Wuhu 241000,China;School of Mechanical Engineering,Nanchang Institute of Technology,Nanchang 330099,China;School of Advanced Manufacturing Engineering,Hefei University,Hefei 230601,China)

机构地区：[1]中国机械总院集团北京机电研究所有限公司,北京100083 [2]中机精密成形产业技术研究院(安徽)股份有限公司,安徽芜湖241000 [3]南昌工程学院机械工程学院,江西南昌330099 [4]合肥学院先进制造工程学院,安徽合肥230601

出　　处：《锻压技术》2023年第1期237-244,共8页Forging & Stamping Technology

摘　　要：塑性成形过程中,金属在模具型腔中处于三向应力状态且其变形温度随着流变应变处于动态变化中,因此,合金的流变应力受变形温度、变形量等多因素的综合作用。利用高温压缩模拟试验和有限元分析软件,研究了7022铝合金在变形温度为350、400和450℃,应变速率为0.01、0.1、1和10 s^(-1),总变形量为50%时的流变应力、变形温度与应变速率之间的关系;利用Arrhenius材料本构关系,构建了7022铝合金的材料本构方程。结果表明:在应变速率和变形温度的综合影响下,7022铝合金的峰值流变应力随着应变速率的增加以及变形温度的下降而升高,在变形温度为350℃、应变速率为10 s^(-1)的形变条件下流变应力达到最大,为156.0 MPa。并通过拟合曲线等方式得到7022铝合金的热激活能为144.332 kJ·mol^(-1)。During the plastic forming process, the metal is in a three-directional stress state in the die cavity and its deformation temperature is in the dynamic change with the rheological strain, and the rheological stress of alloy is affected by many factors such as deformation temperature, deformation amount and so on. Therefore, the relationships among rheological stress, deformation temperature and strain rate at the temperature of 350, 400 and 450 ℃, the strain rates of 0.01, 0.1, 1 and 10 s^(-1)and the total deformation amount of 50% were studied respectively by high temperature compression simulation test and finite element analysis software, and the material constitutive equation of 7022 aluminum alloy was established by using the Arrhenius material constitutive relation. The results show that under the comprehensive influence of strain rate and deformation temperature, the peak rheological stress of 7022 aluminum alloy increases with the increasing of strain rate and the decreasing of deformation temperature, the rheological stress reaches the maximum value of 156.0 MPa in the deformation condition of the deformation temperature of 350 ℃ and the strain rate of 10 s^(-1), and the thermal activation energy of 7022 aluminum alloy is obtained to be 144.332 kJ·mol^(-1)by fitting the curve and other methods.

关 键 词：7022铝合金 热变形 高温力学性能 本构方程 流变应力 

分 类 号：TG146.2[一般工业技术—材料科学与工程]