High Performance Mg Alloy with Designed Microstructure and Phases
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Microstructures before Hot Extrusion
3.2. Microstructures of the As-Extruded Samples
3.3. Tensile Properties
3.4. Strain Evolution and Fracture Characterizations
4. Conclusions
- Regardless of the extrusion conditions, the bimodal microstructure comprises elongated un-DRXed grains, fine DRXed grains, β particles, nano-sized γ’ phases, and LPSO phases in all as-extruded alloys. A larger extrusion ratio induces a higher strain rate and finer LPSO phases, and hence leads to a higher volume fraction of dynamic recrystallization. Meanwhile, because of the pinning effect of extensive β particles, the size of the DRXed grains changes slightly. Both the DDRX behavior and the CDRX behavior contribute to the dynamic recrystallization process.
- The sample extruded with a ratio of 10 exhibits an excellent strength–ductility synergy with a TYS of 374 MPa, a UTS of 440 MPa, and an EL of 13.0%, which is mainly attributed to its fine DRXed grains, extensive β particles, and elongated block-shaped LPSO phases. After ageing treatment, the strength further increases, due to the precipitation strengthening effect induced by β’ phases.
- During the deformation process, the un-DRXed regions firstly show strain localization, and DRXed grains with relatively random orientations can effectively release localized strain and prevent the expansion of micro-cracks, thus promoting uniform plastic deformation and improving the ductility of the alloy. Due to the mismatch of Young’s modulus and deformation incompatibility, the micro-cracks primarily nucleate at the interface of the un-DRXed regions, DRXed regions, and LPSO phases, and then propagate in the un-DRXed regions.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Sample | As-Extruded | As-Aged | ||||
---|---|---|---|---|---|---|
TYS (MPa) | UTS (MPa) | EL (%) | TYS (MPa) | UTS (MPa) | EL (%) | |
R5 | 356 | 420 | 9.8 | 465 | 524 | 8.6 |
R7.5 | 379 | 448 | 11.0 | 487 | 546 | 9.4 |
R10 | 374 | 440 | 13.0 | 477 | 532 | 9.7 |
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Yang, Z.; Xu, C.; Song, S.; Nakata, T.; Kamado, S. High Performance Mg Alloy with Designed Microstructure and Phases. Materials 2024, 17, 2734. https://doi.org/10.3390/ma17112734
Yang Z, Xu C, Song S, Nakata T, Kamado S. High Performance Mg Alloy with Designed Microstructure and Phases. Materials. 2024; 17(11):2734. https://doi.org/10.3390/ma17112734
Chicago/Turabian StyleYang, Zhao, Chao Xu, Shengnan Song, Taiki Nakata, and Shigeharu Kamado. 2024. "High Performance Mg Alloy with Designed Microstructure and Phases" Materials 17, no. 11: 2734. https://doi.org/10.3390/ma17112734