锻压技术

7022 铝合金的高温力学性能和材料本构方程研究

英文标题：Study on high temperature mechanical properties and material constitutive equation for 7022 aluminum alloy

单位：1. 中国机械总院集团北京机电研究所有限公司2. 中机精密成形产业技术研究院(安徽) 股份有限公司 3. 南昌工程学院 4. 合肥学院

分类号：TG146. 2

出版年,卷(期):页码：2023,48(1):237-244

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。

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基金项目：

作者简介: 殷　剑(1997-), 男, 硕士 E-mail: a18726451924@ 163. com 通信作者: 金　康(1978-), 男, 硕士, 高级工程师 E-mail: jinkang@ cmipf. com

参考文献：

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.Key words: 7022 aluminum alloy; hot deformation; high temperature mechanical properties

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