Transactions of Materials and Heat Treatment

Title：Influence of initial microstructures on rheology stress behavior during hot deformation for Al-Cu-Mg-Zr alloy

Authors： Dong Zhaoyu Bo Guowei Fu Dingfa

Unit： Hunan University

KeyWords： Al-Cu-Mg-Zr alloy hot compression rheology stress constitutive equation dynamic softening rate

ClassificationCode：TG146.21

year,vol(issue):pagenumber：2019,44(7):150-158

Abstract：

Combining industrial production, the heat treatment of Al-Cu-Mg-Zr alloy was carried out by air cooling, water quenching and furnace cooling to obtain different initial microstructures. Then, the isothermal hot compression experiments were performed on alloys with different initial microstructures under the deformation temperature of 300-450 ℃ and the strain rate of 0.01-10 s-1. The results show that the rheology stress rapidly reaches peak value and then softens into steady with the increasing of strain. In the three different heat treatment methods, the peak stress and dynamic softening rate of water quenching are the largest, and that of furnace cooling are the smallest. The rheology stress behavior of alloy can be described well by the hyperbolic sine equation, and the deformation activation energies of alloy under air cooling, water quenching and furnace cooling are 180.45, 298.92 and 161.45 kJ·mol-1, respectively.

Funds：

国家自然科学基金资助项目（51674111）

董兆宇（1993-），男，硕士研究生，E-mail：1119144306@qq.com；通讯作者：傅定发（1969-），男，博士，副教授，E-mail：hunu_fudingfa@163.com

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