Grain Refinement, Microstructure and Mechanical Properties Homogeneity of Mg-Gd-Y-Nd-Zr Alloy During Multidirectional Fo
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Grain Refinement, Microstructure and Mechanical Properties Homogeneity of Mg-Gd-Y-Nd-Zr Alloy During Multidirectional Forging Xiangsheng Xia, Changpeng Wang, Yang Wu, Kui Zhang, Minglong Ma, and Baoguo Yuan (Submitted June 28, 2018; in revised form August 15, 2018) Multidirectional forging (MDF) of Mg-Gd-Y-Nd-Zr alloy was performed under decreasing temperature condition. The grain refinement, microstructure and mechanical properties homogeneity of Mg-Gd-Y-NdZr alloy during MDF process were investigated. The results show that the grain refinement mechanism of Mg-Gd-Y-Nd-Zr alloy during MDF process was dynamic recrystallization. The dynamic precipitations were observed after MDF process, which were mainly located at the grain boundaries and had a significant influence on the grain refinement, and the amount of dynamic precipitations increased as the MDF passes increase. The microstructure of the billet was not homogeneous due to the deformation and temperature inhomogeneity during MDF process. Optimization MDF process has been proposed, which benefited the microstructure homogeneity and reduced the amount of the dynamic precipitations. Based on the optimization MDF process, the elongation to fracture significantly increased. Keywords
multidirectional forging, magnesium alloys, microstructure homogeneity, mechanical properties, texture
1. Introduction Driven by the need of high-performance and lightweight materials in the automotive industry and other fields, the magnesium alloys and corresponding fabrication technologies have received much attention in recent years (Ref 1, 2). However, commercial magnesium alloys show lower mechanical properties, which limit their applications. Containing rare earth (RE) magnesium alloys such as Mg-Gd, Mg-Y and MgCe have spawn much interest in the field of lightweight constructions in quest of high strength and excellent creep resistance (Ref 3-5). Among these rare earth magnesium alloys, the Mg-Gd binary alloys possessed high-precipitation strengthXiangsheng Xia, Southwest Technology and Engineering Research Institute, Chongqing 400039, PeopleÕs Republic of China; State Key Laboratory of Nonferrous Metals and Processes, GRIMAT Engineering Institute Co., Ltd., Beijing 101407, PeopleÕs Republic of China; and Collaborative Innovation Center of Precision Forming Integrated Manufacturing Technology, Chongqing 400039, PeopleÕs Republic of China; Changpeng Wang, Southwest Technology and Engineering Research Institute, Chongqing 400039, PeopleÕs Republic of China; Yang Wu, Southwest Technology and Engineering Research Institute, Chongqing 400039, PeopleÕs Republic of China; and Collaborative Innovation Center of Precision Forming Integrated Manufacturing Technology, Chongqing 400039, PeopleÕs Republic of China; Kui Zhang and Minglong Ma, State Key Laboratory of Nonferrous Metals and Processes, GRIMAT Engineering Institute Co., Ltd., Beijing 101407, PeopleÕs Republic of China; and Baoguo Yuan, School of Materials Science and Engineering, Hefei University of Tech
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