期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 32, 期 1, 页码 122-133出版社
ELSEVIER
DOI: 10.1016/S1003-6326(21)65782-5
关键词
magnesium alloy; microstructure; cyclic expansion extrusion; mechanical properties; texture
资金
- International Science and Technology Cooperation Program of Shanxi Province, China [201603D421024]
- Shanxi Scholarship Council of China [2017-095]
This study investigates the microstructure, texture evolution, and mechanical properties of AZ31 magnesium alloy during the cyclic expansion extrusion with the asymmetrical extrusion cavity (CEE-AEC) process. The results show that after 3 passes, the microstructures are refined and the textures are deflected, leading to significant improvements in the mechanical properties of the alloy.
The microstructure, texture evolution and mechanical properties of AZ31 magnesium alloy were investigated during the cyclic expansion extrusion with the asymmetrical extrusion cavity (CEE-AEC) process. The results show that continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) occur during the CEE-AEC process. After 3 passes, the microstructures of the deformed samples are refined, and the average grain size of the alloys in asymmetrical cavity region is 6.9 mu m. The maximum intensities of the basal textures increase with the increase in the number of passes, and the basal textures are deflected during the deformation process. The basal texture of the alloys in asymmetrical cavity region is tilted by approximately +/- 45 degrees from the normal direction (ND) to the extrusion direction (ED). Grain refinement strengthening and texture deflection significantly improve the comprehensive mechanical properties of the deformed alloys. After 3 passes, tensile yield strength (TYS), ultimate tensile strength (UTS) and elongation- to-failure of the alloy in the asymmetric cavity region are 146 MPa, 230 MPa and 29.7%, respectively.
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