Transactions of Materials and Heat Treatment

Title：High-temperature constitutive equation and hot processing map for Al-Zn-Mg-Cu aluminum alloy

Authors： Xu Jinhao Long Ya

Unit： School of Rail Transit Zhejiang Institute of Communications Hangzhou 311112 China

KeyWords： Al-Zn-Mg-Cu aluminum alloy isothermal hot compression constitutive equation hot processing map microstructure

ClassificationCode：TG146.2；TG316

year,vol(issue):pagenumber：2025,50(6):259-267

Abstract：

To investigate the high-temperature constitutive relationship and hot processing window of Al-Zn-Mg-Cu aluminum alloy, firstly, the isothermal hot compression test of Al-Zn-Mg-Cu aluminum alloy was conducted by thermal simulation machine Gleeble-3500, and its high-temperature rheological properties under the deformation temperature of 623-773 K and the strain rates of 0.001-1 s-1 were studied. Secondly, a new high-precision constitutive equation of the alloy was established by high-order gradient information, and the calculation model of the hot processing map was derived based on this equation. Finally, the rationality of the hot processing map was verified by metallographic tests in typical regions. The hot compression curves indicate that under low strain rate conditions, the stress of the aluminum alloy first rises rapidly and then slowly decreases and finally stabilizes with the increasing of strain. Under high strain rate conditions, the stress first rises rapidly and then drops sharply, followed by a slow increase, and finally slowly decreases to stability. Partial derivative analysis reveals that the second-order approximation between lnσ and lnε· and the first-order approximation between lnσ and T can construct a constitutive equation with high accurate and few parameters. Hot processing map and metallographic analysis demonstrate that the stable hot processing window is the strain rate of 0.001-0.035 s-1 and the deformation temperature of 623-773 K.

Funds：

浙江省教育厅一般科研项目（Y202352134）

作者简介：徐槿昊(1989-)，女，硕士，讲师，E-mail：olivia8907@163.com

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