Transactions of Materials and Heat Treatment

Title：Influence of strain on in-situ tensile microstructure evolution for automotive extruded Mg-4Zn-1.2Y alloy

Authors： Yang Jingjiang1 Zhang Ming2 Li Gang3

Unit： 1.Geely Automobile College Hangzhou Vocational and Technical College 2.School of Mechanical Engineering Zhejiang University of Technology 3.Zhejiang Geely Automobile Manufacturing Co. Ltd.

KeyWords： magnesium alloy in-situ tensile microstructure evolution strain micro-cracks

ClassificationCode：TG146

year,vol(issue):pagenumber：2022,47(9):245-249

Abstract：

The test of Mg-4Zn-1.2Y alloy for auto mobile lightweight was conducted by comprehensively using in-situ electron backscatter diffraction (EPD) and micro-tensile test methods, and the influence of strain on the in-site tensile microstructure evolution for alloy was analyzed. The research results show that the tensile strength of specimen is 218 MPa, the elongation is 25.3% obtained by in-situ tensile test, and the specimen breaks at the strain of 26%. With the increasing of tensile strain degree, more cracks occur in the alloy and the crack size increases. The twins produced in the tensile process can coordinate the grain deformation to a certain extent to eliminate the stress concentration phenomenon and avoid the crystal structure cracking. When the grain orientation angle of initial tensile specimen is in the range of 0°-50°, the quantitutive distribution of grain orientation angles is close to normal distribution characteristic, and the grain orientation angle is mainly in the range of 20°-30°. When the strain reaches 20%, the proportion of orientation angles in the range of 20°-30° is more than 10%, and the twinning produced in Mg-4Zn-1.2Y alloy under the in-situ tensile strain of 15% plays a good role in regulating grain orientation.

Funds：

浙江省自然科学基金资助项目(LQ19E050104)

杨敬江(1981-)，男，硕士，高级实验师 E-mail：yh15036956421@163.com

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