Effect of Heat Treatment on Mg-9Gd-3Y-0.3Zr Alloy Microstructure and Properties

2nd International Symposium on Application of Materials Science and Energy Materials

材料科学;能源学

Kong, Fanxiao^1 ; Sun, Youping^1 ; Yao, Sujuan^2

School of Automobile and Traffic Engineering, Guangxi University of Science and Technology, Liuzhou, Guangxi

545006, China^1

Science and Technology Research Institute of CHALCO, Beijing

100036, China^2

关键词: Effect of heat treatments;    Fracture characteristics;    High-temperature resistant;    Room and high temperatures;    T5 heat treatments;    T6 heat treatment;    Temperature increase;    Treatment methods;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/490/2/022072/pdf
DOI  :  10.1088/1757-899X/490/2/022072

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The paper explored microstructure, mechanical properties, and fracture characteristics of the cast and extruded Mg-9Gd-3Y-0.3Zr alloys on the different heat treatment systems, analyzed the phase composition and the grain crystal growth of the investigated alloys. By the way of optimizing the heat treatment method, the mechanical properties of the alloys both at room and high temperature was Significantly increased. The research shows that the Vickers hardness of the cast alloys on T6 heat treatment system is obviously higher than that on T5 system. The second-phrase particles rich in Gd, Y and Zr, and the Zr elemental particles dispersing in the grains and its boundaries can effectively fine the grain crystal. As the temperature increases from room temperature to 300°C, the fracture mode changed from typical cleavage to mixture of quasi-cleavage and tough dimple. Meanwhile, the Vickers hardness of the extruded alloys on T5 heat treatment system is slightly higher than that on T6 system, though the tensile strength is significantly higher. The fracture characteristics of the extruded alloys change from cleavage initiated from the heart plus tough dimple surrounding to ductile fracture of microspore aggregation, as the temperature increases from room temperature to 300°C. On conclusion, the tensile strength of the Mg-9Gd-3Y-0.3Zr extruded alloys at 300°C is about 327MPa and suitable for high temperature resistant alloy.