Transactions of Materials and Heat Treatment

Title：Constitutive model and microstructure evolution of AA6061 aluminum alloy casting blank in plain compression

Authors： Qin Fangcheng Qi Huiping Kang Yuehua Li Yongtang Liu Chongyu

Unit： Guilin University of Technology Taiyuan University of Science and Technology Guangdong Institute of Materials and Processing

KeyWords： AA6061 aluminum alloy casting blank plain compression rheological stress constitutive model microstructure evolution

ClassificationCode：TG146.2

year,vol(issue):pagenumber：2019,44(12):159-166

Abstract：

The plain compression deformation behaviors of AA6061 aluminum alloy casting blank were studied by Gleeble-3500 thermal simulator, and the rheological stress and microstructure evolution were analyzed. The results show that the rheological stress decreases with the increasing of deformation temperature and the decreasing of strain rate during the plain compression process, and at a low temperature and low strain rate(573 K/0.01 s-1), with the increasing of strain, the stress softening degree becomes larger after reaching the peak stress. At the same time, the hyperbolic-sine type constitutive model is developed to describe the plain compression deformation behaviors of AA6061 aluminum alloy casting blank. Therefore, the grains in the large deformation areas are characterized by the elongated lath-shape, and the second phases are precipitated in the grain boundaries. Furthermore, the length-diameter ratio of grain decreases with the increasing of temperature and increases with the increasing of strain rate, the microstructures in the small deformation areas are described by oval equiaxial grains, and the second phase dissolves into the grain at the higher temperature（723 K）. Thus, the mechanism of the microstructure evolution in thermal deformation is mainly dynamic recovery.

Funds：

广东省科学院创新驱动发展项目(2018GDASCX-0965)；广西自然科学基金青年项目(2018GXNSFBA281056)；国家自然科学基金面上项目(51575371, 51875383)；桂林理工大学科研启动基金(GUTQDJJ2017140)；广西科技重大专项 (GKAA17202007)

秦芳诚（1988-），男，博士，讲师，硕士生导师 E-mail：qinfangcheng@glut.edu.cn 通讯作者：齐会萍（1974-），女，博士，副教授，硕士生导师 E-mail：qhp9974@tyust.edu.cn

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