Effects of Zn Addition and Twin Roll Casting Process on the Microstructure, Texture, and Mechanical Properties of the Mg-Al-Mn-Ca Sheet
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
4. Conclusions
- In the TRC AZMX1100 sheet, a columnar structure inclined along the rolling direction and centerline segregation was observed, while a coarse grain structure with about 120 µm in average size was formed in the DC cast block. A higher fraction of the second phase was formed in the AMX100 alloy than in the AZMX1100 alloy sheets.
- The TRC AZMX1100 sheet showed the finest grain structure with an average grain size of 8.4 µm, which results from the alloying elements dissolving in the matrix as solid solution at a higher concentration due to the fast cooling rate of the TRC process. The casting AZMX1100 and casting AMX100 sheets show a similar grain size of approximately 11.0 µm. However, a relatively coarse grain structure with a large number of Al2Ca phases is formed in the AMX100 sheet.
- In all the sheets examined in this study, a weak texture with the basal pole spread in the RD or TD was developed. The texture was further weakened by the subsequent heat treatment. The Zn-containing TRC AZMX1100 and casting AZMX1100 sheets showed the basal poles largely tilted in the TD, independent of the process.
- The high YS of the casting AZMX1100 sheet was brought about by the strengthening by the solid solution and fine precipitates, while the highest YS of 174 MPa of the TRC AZMX1100 sheet is additionally attributed to the finer grain size. The planar anisotropy in the yield strength can be understood from the texture of the sheets. For example, the lower YS in the RD of the AMX100 sheet results from the basal poles tilted in the RD, while the lower YS in the TD of the AZMX1100 sheet is associated with the basal poles largely tilted in the TD.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Alloy | Nominal Composition (wt.%) | Casting Method | Rolling | Recrystallization Annealing |
---|---|---|---|---|
Casting AMX100 | Mg-1Al-0.2Mn-0.5Ca | DC casting | Hot rolling at 410 °C, total reduction 79% (common to all alloys) | 350 °C for 120 min (common to all alloys) |
Casting AZMX1100 | Mg-1Al-1Zn-0.2Mn-0.5Ca | DC casting | ||
TRC AZMX1100 | Mg-1Al-1Zn-0.2Mn-0.5Ca | Twin roll casting |
Process | Alloy | RD | TD | ||||
---|---|---|---|---|---|---|---|
YS (MPa) | UTS (MPa) | εf (%) | YS (MPa) | UTS (MPa) | εf (%) | ||
Casting | AMX100 | 137 ± 3 | 216 ± 3 | 21.1 ± 2.5 | 148 ± 3 | 214 ± 3 | 18.2 ± 2.9 |
AZMX1100 | 153 ± 3 | 237 ± 2 | 22.9 ± 1.3 | 130 ± 4 | 234 ± 4 | 26.9 ± 1.1 | |
TRC | AZMX1100 | 174 ± 3 | 250 ± 2 | 20.5 ± 1.1 | 151 ± 3 | 244 ± 3 | 23.6 ± 1.2 |
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Eom, D.; Yi, S.; Letzig, D.; Park, N.-J. Effects of Zn Addition and Twin Roll Casting Process on the Microstructure, Texture, and Mechanical Properties of the Mg-Al-Mn-Ca Sheet. Metals 2024, 14, 261. https://doi.org/10.3390/met14030261
Eom D, Yi S, Letzig D, Park N-J. Effects of Zn Addition and Twin Roll Casting Process on the Microstructure, Texture, and Mechanical Properties of the Mg-Al-Mn-Ca Sheet. Metals. 2024; 14(3):261. https://doi.org/10.3390/met14030261
Chicago/Turabian StyleEom, Donghwan, Sangbong Yi, Dietmar Letzig, and No-Jin Park. 2024. "Effects of Zn Addition and Twin Roll Casting Process on the Microstructure, Texture, and Mechanical Properties of the Mg-Al-Mn-Ca Sheet" Metals 14, no. 3: 261. https://doi.org/10.3390/met14030261