Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 32, Issue 9, Pages 2866-2876Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(22)65989-2
Keywords
Mg alloys; extrusion; mechanical properties
Categories
Funding
- National Natural Science Foundation of China
- Fundamental Research Funds for the Central Universities Project, China
- Chongqing Academician Special Fund, China
- [51971042]
- [51901028]
- [2021CDJQY-038]
- [cstc2018jcyj-yszxX0007]
- [cstc2019yszx-jcyjX0004]
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The closed forging extrusion (CFE) process can effectively refine the grain of AZ31 magnesium alloy, improving its strength and plasticity, providing a new technological approach for magnesium alloy processing.
A novel continuous plastic process employed on AZ31 Mg alloy called closed forging extrusion (CFE) was presented. The optical microscopy, scanning electron microscopy, electron back-scatter diffraction and tensile and compressive tests were employed to investigate the microstructure evolution and strengthening mechanism. The results indicated that the CFE-process can promote dynamic recrystallization (DRX), eliminate the coarsen unDRXed grain regions, refine the grains effectively, and improve the strength, plasticity and anisotropy of the alloy. The grain refinement was mainly attributed to the stress, which facilitated the nucleation of recrystallization and refined the microstructure via the CFE. The fully DRXed ultrafine grained structure improved the strength and plasticity simultaneously. After 60 s closed forging and continuous extrusion, the alloy exhibits relatively high TYS, UTS, CYS, elongation and yield asymmetry of 305 MPa, 337 MPa, 295 MPa, 27% and 0.97, respectively.
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