Effect of hot rolling on grain refining and mechanical properties of AZ40 magnesium alloy
来源期刊：中国有色金属学报(英文版)2011年第z2期
论文作者：WANG Hai-lu WANG Guo-jun HU Lian-xi WANG Qiang WANG Er-de
文章页码：229 - 234
Key words：AZ40 Mg alloy; hot rolling; grain refining; mechanical properties
Abstract: AZ40 Mg alloy thin sheets were prepared by multi-pass hot rolling with the hot-extruded alloy as the starting material. The effect of hot rolling on the microstructure, mechanical properties, and fracture behavior of the alloy was investigated. The results show that the microstructure homogeneity can be improved and the grain size is refined steadily by dynamic recrystallization with increasing rolling passes. As a consequence, the mechanical properties of the as-rolled sheets are improved significantly as compared with the starting as-extruded alloy. By 5 or more rolling passes, the average grain size is reduced to no more than 10 μm, and the yield strength and the tensile elongation of the sheets prepared achieve as high as more than 175 MPa and 20%, respectively, in both the rolling and the transverse direction.
WANG Hai-lu1, WANG Guo-jun2, HU Lian-xi1, WANG Qiang2, WANG Er-de1
(1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;
2. Technical Center, Northeast Light Alloy Co. Ltd., Harbin 150060, China)
Abstract:AZ40 Mg alloy thin sheets were prepared by multi-pass hot rolling with the hot-extruded alloy as the starting material. The effect of hot rolling on the microstructure, mechanical properties, and fracture behavior of the alloy was investigated. The results show that the microstructure homogeneity can be improved and the grain size is refined steadily by dynamic recrystallization with increasing rolling passes. As a consequence, the mechanical properties of the as-rolled sheets are improved significantly as compared with the starting as-extruded alloy. By 5 or more rolling passes, the average grain size is reduced to no more than 10 μm, and the yield strength and the tensile elongation of the sheets prepared achieve as high as more than 175 MPa and 20%, respectively, in both the rolling and the transverse direction.
Key words:AZ40 Mg alloy; hot rolling; grain refining; mechanical properties
