Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure and Texture of the Extruded ZK60 Alloys with and without RE Addition
3.2. Influence of RE Element Addition on the Mechanical Properties of the Extruded ZK60 Alloy
4. Conclusions
- (1)
- Adding RE elements to the ZK60 alloy caused grain refinement, the formation of new precipitates, and an enhanced volume fraction of precipitates. The grain size reduction from 6.5 μm to 2.1 and 2.8 μm due to the addition of Y and Ce-rich RE elements, respectively, was attributed to the nucleation of new grains due to CDRX and PSN phenomena, and the pinning effects of second phase particles that hindered grain growth.
- (2)
- In the RE-containing alloys, the texture intensity increased, and the highest texture intensity was achieved in the ZK60–2Y alloy. The higher texture intensity was due to the higher volume fractions of un-DRXed grains in the materials alloyed with Y and Ce-rich RE elements. The higher dislocation density in the ZK60-2RE alloy compared to the ZK60-2Y material can be explained by the expected higher concentration of solute atoms and their larger atomic radii compared to sample ZK60-2Y.
- (3)
- The addition of RE elements increased the strength due to the solute and precipitate strengthening, and the grain size hardening. The ZK60–2Y and ZK60–2RE alloys exhibited lower ductility than the base alloy did due to the smaller grain size and the weakening effect of secondary phase particles on the grain boundary strength. These precipitates acted as stress concentration sites under loading, resulting in crack nucleation and/or easier crack propagation along the grain boundaries. The cracking was also facilitated by the higher stress level caused by the small grain size. The ZK60–2Y alloy exhibited the lowest work hardening rate due to the smallest grain size.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Alloy | Grain Size (µm) | fP (%) | fDRX (%) | fHAGB (%) | ρ (1014 m−2) | Crystallite Size (nm) | σy (MPa) | UTS (MPa) |
---|---|---|---|---|---|---|---|---|
ZK60 | 6.5 ± 0.3 | 2 ± 0.5 | 96.1 | 95.2 | 1.2 ± 0.2 | 119 ± 14 | 212 ± 9 | 299 ±11 |
ZK60–2Y | 2.1 ± 0.2 | 14 ± 1 | 63.4 | 92.5 | 1.0 ± 0.2 | 96 ± 10 | 303 ± 6 | 348 ± 8 |
ZK60–2RE | 2.8 ± 0.1 | 15 ± 1 | 61.2 | 92.7 | 2.3 ± 0.2 | 74 ± 10 | 299 ± 7 | 337 ± 5 |
Alloy | (MPa) | σs (MPa) | Hc | n |
---|---|---|---|---|
ZK60 | 1016 | 170 | 0.81 | 0.30 |
ZK60–2Y | 1090 | 102 | 0.34 | 0.13 |
ZK60–2RE | 1194 | 134 | 0.47 | 0.19 |
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Najafi, S.; Sheikhani, A.; Sabbaghian, M.; Nagy, P.; Fekete, K.; Gubicza, J. Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements. Materials 2023, 16, 2828. https://doi.org/10.3390/ma16072828
Najafi S, Sheikhani A, Sabbaghian M, Nagy P, Fekete K, Gubicza J. Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements. Materials. 2023; 16(7):2828. https://doi.org/10.3390/ma16072828
Chicago/Turabian StyleNajafi, Soroush, Alireza Sheikhani, Mahdi Sabbaghian, Péter Nagy, Klaudia Fekete, and Jenő Gubicza. 2023. "Modification of the Tensile Performance of an Extruded ZK60 Magnesium Alloy with the Addition of Rare Earth Elements" Materials 16, no. 7: 2828. https://doi.org/10.3390/ma16072828