Journal
METALS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/met10010136
Keywords
microstructure; texture evolution; mechanical properties; Mg-13Gd-4Y-2Zn-0; 5Zr alloy; high and low temperature cycle deformation
Funding
- Shanxi Graduate Education Innovation Project [2019BY103]
- Key R&D program of Shanxi Province (International Cooperation) [201903D421036]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi [2018002]
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The current work systematically investigated the microstructure, texture evolution, and mechanical properties of MDFed Mg-13Gd-4Y-2Zn-0.5Zr (wt%) alloy (GWZ) on the condition of high and low temperature cycle deformation. The high and low temperature cycle deformation was proposed on the basis of the conventional multi-directional forging (MDF) at decreasing temperature and annealing treatment. As a new method, it was aimed to timely uniform the microstructure and strengthen magnesium (Mg) matrix during the deformation process. A low accumulative strain of 3 after 1 pass resulted in a bimodal microstructure with undynamic recrystallized (unDRXed) regions and dynamic recrystallized (DRXed) grains, while a high accumulative strain of 12 after 4 passes lead to a homogeneous microstructure with fine DRXed grains. According to the experimental results, it indicated that the average grain size of 63 mu m after homogenization treatment at 520 was refined remarkably to 5.20 mu m after 4 passes at 420 degrees C through high and low temperature cycle deformation. The area fraction of DRXed grains was increased to 98.4%, which can be regarded as achieving complete DRX after 4 passes. The grain refinement was mainly caused by particle stimulation nucleation (PSN) and mechanism. As the MDF passes and accumulative strain increased, the basal texture was weakened and transformed from a strong basal texture to a random distribution gradually. Compared with conventional MDF at decreasing temperature, the mechanical properties were enhanced effectively. After 4 passes, the ultimate tensile strength (UTS), tensile yield strength (TYS), and failure elongation (FE) were 405 MPa, 305 MPa, and 13.1%, respectively.
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