Transactions of Materials and Heat Treatment

Title：Numerical simulation and experimental study on continuous extrusion of AZ31 magnesium alloy sheet

Authors： Li Zhiyong Pei Jiuyang Guo Lili Wang Yanhui

Unit： Dalian Jiaotong University

KeyWords： continuous extrusion AZ31 magnesium alloy sheet microstructure mechanical property fracture mechanism

ClassificationCode：TG379

year,vol(issue):pagenumber：2019,44(7):15-20

Abstract：

The continuous extrusion process of AZ31 magnesium alloy sheet (170 mm×4 mm) was simulated by finite element software HyperXtrude, and the single rod split welding die structure was optimized. Then, the continuous extrusion experiments were conducted by the optimized die structure, and the AZ31 magnesium alloy sheet with good surface quality was obtained. Furthermore, the microstructure of AZ31 magnesium alloy sheet was observed. The results show that the grain size is unevenly distributed on the cross section, the fine grain belt appears on the surface of weld zone, and a large number of twins are found in the middle and edge areas of sheet. This is due to the different temperatures and deformation degrees on the cross section of sheet during the extending forming process. Finally, the mechanical properties were tested. It is found that the longitudinal tensile strength reaches 200.4 MPa, and the elongation is 20.8%. However the transverse strength (weld strength) is 170.6 MPa, and the elongation is 7.1%. Thus, from the fracture morphologies, the fracture mechanism of the longitudinal sample is dominated by the ductile fracture, but that of the transverse and 45° direction samples are mainly brittle fracture.

Funds：

国家自然科学基金青年基金项目（51401043）;大连市科技之星项目（2017RQ139）

李智勇（1994-），男，硕士研究生，E-mail：lijiu94@163.com；通讯作者：裴久杨（1981-），男，博士，讲师，E-mail：peijiuyang@163.com

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