Dynamic recrystallization behavior and spinning texture formation mechanism of magnesium alloy wheel hub
(1. School of Mechanical and Electrical Engineering, Guangdong University of Science and Technology, Dongguan 523083, China;
2. Faculty of Digital of Science and Technology, Macau Millennium College, Macau 999078, China;
3. School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;
4. CITIC Dicastal Co., Ltd., Qinhuangdao 066000, China;
5. National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)
2. Faculty of Digital of Science and Technology, Macau Millennium College, Macau 999078, China;
3. School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;
4. CITIC Dicastal Co., Ltd., Qinhuangdao 066000, China;
5. National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China)
Abstract: The dynamic recrystallization (DRX) behavior and texture formation mechanism in an AZ31 magnesium alloy wheel hub during the spinning process were investigated. Analysis using optical microscopy, electron backscatter diffraction, transmission electron microscopy, and finite element simulation revealed that continuous dynamic recrystallization (CDRX) and grain boundary bulging occurred simultaneously throughout the spinning process, leading to an increased proportion of DRXed grain areas. The newly formed DRXed grains largely retained the orientations of their deformed parent grains. The spinning process had two stages: initially, deformation was driven by basal áa？ slip as the roller contacted the alloy and descended to its lowest point. In the later stage, pyramidal ác+a？ slips became predominant as additional force was applied along the spinning direction (SD), forming a final texture with the c-axis tilting ±15° towards the SD. This texture development led to discernible anisotropy in tensile properties along the SD and the tangential direction (TD).
Key words: magnesium alloy wheel hub; dynamic recrystallization; spinning texture; dislocation slip; mechanical anisotropy