Transactions of Materials and Heat Treatment

Title：Microstructure and properties of automotive high-strength magnesium alloy by extrusion-forging compound forming

Authors： Wu Weimin1 Sun Chenyu2

Unit： 1.School of Automotive Engineering Shanxi Vocational University of Engineering Science and Technology 2.College of Materials Science and Engineering Taiyuan University of Technology

KeyWords： automotive materials Mg-6Al-4Sn magnesium alloy extrusion-forging compound forming microstructure mechanical property

ClassificationCode：TG379；TG319

year,vol(issue):pagenumber：2022,47(12):27-30

Abstract：

In order to study the microstructure and mechanical properties of automotive high-strength magnesium alloy by extrusion-forging compound forming, Mg-6Al-4Sn high-strength magnesium alloy specimens for automotive were prepared by extrusion-forging compound forming method, and the microstructure of specimen was analyzed by metallography and SEM. Then, the mechanical properties of specimen were tested at room temperature, and the tensile fracture of specimen was analyzed by SEM. The results show that Mg-6Al-4Sn automotive high-strength magnesium alloy with fine microstructure and good mechanical properties can be obtained by extrusion-forging compound forming, the internal grains of alloy are fine, the structure distribution is relatively uniform, the average grain size is about 6.2 μm, and there are spherical large granular Mg17Al12 phase and dispersed fine granular Mg2Sn phase on the matrix. The tensile strength of Mg-6Al-4Sn automotive high-strength magnesium alloy by extrusion-forging compound forming is 312 MPa, the yield strength is 268 MPa, the elongation after fracture is 15.6%, and the tensile fracture presents a dimple-like pattern, accompanied by evenly distributed tear edges, which shows obvious ductile fracture characteristics.

Funds：

国家自然科学基金资助项目（51308396）；山西省高等学校教学改革创新项目（J2020440）

武卫民（1972-），男，本科，高级实习指导教师 E-mail：youangzhan7199@163.com

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