Transactions of Materials and Heat Treatment

Title：Constitutive relationship and microstructure evolution of Al-8.79Zn-2.16Mg-2.11Cu-0.12Zr alloy

Authors： Zhuang Dayong Ren Dawei Li Yang Pan Hongwei Feng Xiang Zhou Lili

Unit： CSIC Guanghan Gas Turbine Co. Ltd.

KeyWords： Al-Zn-Mg-Cu alloy thermal compression constitutive relationship microstructure recrystallization

ClassificationCode：TG301

year,vol(issue):pagenumber：2024,49(6):239-248

Abstract：

In order to solve the unqualified phenomenon of extrusion, stamping and forging of high-strength aluminum alloys in the process of industrial mass production, for Al-8.79Zn-2.16Mg-2.11Cu-0.12Zr alloy, its isothermal compression deformation test was carried out by thermal simulation machine, and the thermodynamic behavior characteristic and microstructure evolution of alloy at high temperature were analyzed. Then, two constitutive relationships of Al-8.79Zn-2.16Mg-2.11Cu-0.12Zr alloy with and without considering strain compensation were established, and the rheological stress prediction was conducted. The research results show that the rheological stress is very sensitive to strain rate and temperature, and continuous dynamic recrystallization occurs under low strain rate conditions. The constitutive relationship considering strain compensation has a higher prediction accuracy, the fraction of recrystallization under the deformation condition of 390 ℃/5 s-1 is the largest, which is about 17%, and the critical stress value of recrystallization is the largest, which is 65.28 MPa.

Funds：

重点基础材料技术与产业化项目（2016YFB0300900）

作者简介：庄大勇（1985-），男，硕士，工程师，E-mail：zhuangdayongyong@163.com

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