期刊
MATERIALS
卷 13, 期 14, 页码 -出版社
MDPI
DOI: 10.3390/ma13143050
关键词
AZ31 alloy; high strain rate biaxial forging; twinning; twining induced dynamic recrystallization; texture; mechanical property
类别
资金
- National Natural Science Foundation of China [51501061]
- Natural Science Foundation of Hunan Province [2019JJ30009, 2018JJ4030]
- Key Scientific Research Fund of Hunan Provincial Education Department of China [18A423]
- National students' platform for innovation and entrepreneurship training program [201811528018]
High strain rate biaxial forging (HSRBF) was performed on AZ31 magnesium alloy to an accumulated strain of Sigma Delta epsilon = 1.32, the related microstructure, texture and mechanical properties were investigated. It was found that the microstructure evolution can be divided into two steps during HSRBF. In the early forging processes, the refinement of the grain is obvious, the size of similar to 10 mu m can be achieved; this can be attributed to the unique mechanisms including the formation of high density twins ({10 (1) over bar2} extension twin and {10 (1) over bar1}-{10 (1) over bar2} secondary twin) and subsequently twining induced DRX (dynamic recrystallization). The thermal activated temperature increases with the increase of accumulated strain and results in the grain growth. Rolling texture is the main texture in the high strain rate biaxial forged (HSRBFed) alloys, the intensity of which decreases with the accumulated strain. Moreover, the basal pole rotates towards the direction of forging direction (FD) after each forging pass, and a basal texture with basal pole inclining at 15-20 degrees from the rolling direction (RD) is formed in the full recrystallized HSRBFed alloys. The grain refinement and tiled texture are attributed to the excellent strength and ductility of HSRMBFed alloys with full recrystallized structure. As the accumulated strain is Sigma Delta epsilon = 0.88, the HSRMBFed alloy displays an outstanding combination of mechanical properties, the ultimate tensile strength (UTS) is 331.2 MPa and the elongation is 25.1%.
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