7075-T6高强铝合金温热变形本构方程及热加工图

doi:10.13330/j.issn.1000-3940.2023.09.029

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锻压技术 ›› 2023, Vol. 48 ›› Issue (9) : 230-238. DOI: 10.13330/j.issn.1000-3940.2023.09.029

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材料与成形性能

7075-T6高强铝合金温热变形本构方程及热加工图

彭宇¹, 杨程¹, 彭迎娇¹, 杨浩鑫¹, 赵升吨²

作者信息 +

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

Peng Yu¹, Yang Cheng¹, Peng Yingjiao¹, Yang Haoxin¹, Zhao Shengdun²

Author information +

文章历史 +

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。

Abstract

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^-1was 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.

导出引用

彭宇, 杨程, 彭迎娇, 杨浩鑫, 赵升吨. 7075-T6高强铝合金温热变形本构方程及热加工图[J]. 锻压技术, 2023, 48(9): 230-238 https://doi.org/10.13330/j.issn.1000-3940.2023.09.029

Peng Yu, Yang Cheng, Peng Yingjiao, Yang Haoxin, Zhao Shengdun. Warm deformation constitutive equation and thermal processing map of 7075-T6 high strength aluminum alloy[J]. Forging & Stamping Technology, 2023, 48(9): 230-238 https://doi.org/10.13330/j.issn.1000-3940.2023.09.029

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