锻压技术

7075-T6高强铝合金温热变形本构方程及热加工图

英文标题：Warm deformation constitutive equation and thermal processing map of 7075-T6 high strength aluminum alloy

分类号：TG146.2

出版年,卷(期):页码：2023,48(9):230-238

摘要：

为了获得7075高强铝合金的温热成形合理变形的工艺参数，采用Gleeble3500热模拟试验机测试7075T6铝合金的应力-应变曲线。研究了该合金在变形温度为150~300 ℃和应变速率为0.01~10 s-1条件下的流变行为，并基于Arrhenius本构方程建立了0.3~0.6应变下7075T6铝合金的热加工图，最后结合金相显微组织验证了热加工图的可靠性和实用性。结果表明：7075T6铝合金对变形温度、应变速率、应变量具有高度敏感性，热形变激活能Q=291.151 kJ·mol-1；修正后的Arrhenius本构方程的拟合结果良好，相关系数r值与平均绝对误差AARE分别为99.65%和5.54%，能较好地预测7075T6铝合金的流变行为；在应变为0.6时，最佳的温热加工安全区域范围为温度为250~300 ℃、应变速率为0.01~0.05 s-1。

In order to obtain the reasonable deformation process parameters of warm forming for 7075 high strength aluminum alloy, the stress-strain curve of 7075-T6 aluminum alloy was tested by thermal simulation testing machine Gleeble-3500, and the rheological behavior of 7075-T6 aluminum alloy under the conditions of the deformation temperature of 150-300 ℃ and the strain rate of 0.01-10 s-1 was studied. Then, the thermal processing map of 7075-T6 aluminum alloy under the strain of 0.3-0.6 was established based on Arrhenius constitutive equation, and the reliability and practicability of the thermal processing map were verified by metallographic microstructure. The results show that 7075-T6 aluminum alloy is highly sensitive to deformation temperature, strain rate and strain amount, and the thermal deformation activation energy Q is 291.151 kJ·mol-1. The fitting result of the modified Arrhenius constitutive equation is good, and the correlation coefficient r value and the average absolute error AARE are 99.65% and 5.54% respectively, which can better predict the rheological behavior of 7075-T6 aluminum alloy. When the strain is 0.6, the best warm processing safe zone range is the temperature of 250-300 ℃ and the strain rate of 0.01-0.05 s-1.

基金项目：

国家自然科学基金资助项目（51874226）；西安市科技局科技创新引导项目（201805033YD11CG17（10））

作者简介：彭宇（1995-），男，硕士研究生 E-mail：1062015258@qq.com 通信作者：杨程（1976-），男，博士，副教授 E-mail：yang.cheng@stu.xjtu.edu.cn

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