Effects of La Addition on the Microstructure, Thermal Conductivity and Mechanical Properties of Mg-3Al-0.3Mn Alloys
Abstract
:1. Introduction
2. Experimental Procedures
3. Results and Discussion
3.1. Microstructure of Mg-3Al-xLa-0.3Mn Alloys
3.2. Thermal Conductivity of Mg-3Al-xLa-0.3Mn Alloys
3.3. Mechanical Properties of Mg-3Al-xLa-0.3Mn Alloys
4. Conclusions
- The thermal conductivity of the as-cast Mg-3Al-xLa-0.3Mn alloys increases gradually with the La content, which is due to the gradual increase of Al11La3 phase content and the decrease of solute Al in the Mg matrix.
- The yield strength of the as-cast alloys gradually increases with the increase of La content, while the tensile strength and elongation possess the opposite trend, which is attributed to grain refinement, the increase of second phase content and the change of distribution morphology.
- The thermal conductivity of the as-extruded alloys is lower than that of the as-cast ones due to the generation of defects such as a large amount of grain boundaries and dislocations. In addition, anisotropic thermal conductivity is generated because of the texture, i.e., the thermal conductivity perpendicular to the ED is higher than that parallel to the ED.
- After extrusion, the mechanical properties of the alloy are remarkably enhanced, while the yield strength and tensile strength of the as-extruded alloys gradually decrease with the La content increasing, and the elongation possesses a peak value with La content of 3 wt.%. This is owing to the combined effect of the texture strengthening and second phase strengthening.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Alloys | Composition (wt.%) | |||
---|---|---|---|---|
Al | La | Mn | Mg | |
Mg-3Al-1La-0.3Mn | 2.73 | 0.99 | 0.29 | Bal. |
Mg-3Al-3La-0.3Mn | 2.58 | 2.86 | 0.25 | Bal. |
Mg-3Al-5La-0.3Mn | 2.85 | 5.07 | 0.30 | Bal. |
Positions | Chemical Compositions (at.%) | Phase | |||
---|---|---|---|---|---|
Mg | Al | La | Mn | ||
A | 44.26 | 33.91 | 5.32 | 16.51 | Al8Mn5 |
B | 92.42 | 6.73 | 0.77 | 0.08 | Al11La3 |
C | 92.13 | 6.71 | 1.02 | 0.13 | Al11La3 |
D | 95.69 | 4.21 | 0.02 | 0.08 | α-Mg |
E | 83.26 | 13.82 | 2.74 | 0.17 | Al11La3 |
F | 82.47 | 10.36 | 7.06 | 0.11 | Mg12La |
G | 86.08 | 10.56 | 3.24 | 0.13 | Al11La3 |
H | 99.22 | 0.62 | 0.02 | 0.14 | α-Mg |
Alloys | As-Cast Thermal Conductivity (W/(m·K)) | As-Extruded Thermal Conductivity (W/(m·K)) | |
---|---|---|---|
Mg-3Al-1La-0.3Mn | 93.9 | 87.1 | 86.4 |
Mg-3Al-3La-0.3Mn | 99.3 | 94.9 | 92.9 |
Mg-3Al-5La-0.3Mn | 120.2 | 117.4 | 113.8 |
Alloys | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation to Failure (%) |
---|---|---|---|
as-cast Mg-3Al-1La-0.3Mn | 57.0 ± 2.1 | 152.1 ± 6.7 | 7.1 ± 1.1 |
as-cast Mg-3Al-3La-0.3Mn | 62.9 ± 3.2 | 130.1 ± 5.6 | 4.5 ± 0.5 |
as-cast Mg-3Al-5La-0.3Mn | 63.8 ± 2.1 | 95.8 ± 6.2 | 1.6 ± 0.4 |
as-extruded Mg-3Al-1La-0.3Mn | 326.2 ± 3.3 | 360.2 ± 6.9 | 9.2 ± 0.6 |
as-extruded Mg-3Al-3La-0.3Mn | 309.1 ± 6.1 | 339.1 ± 6.5 | 15.6 ± 1.1 |
as-extruded Mg-3Al-5La-0.3Mn | 271.0 ± 2.4 | 332.2 ± 5.1 | 10.8 ± 1.3 |
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Liu, H.; Zuo, J.; Nakata, T.; Xu, C.; Wang, G.; Shi, H.; Tang, G.; Wang, X.; Kamado, S.; Geng, L. Effects of La Addition on the Microstructure, Thermal Conductivity and Mechanical Properties of Mg-3Al-0.3Mn Alloys. Materials 2022, 15, 1078. https://doi.org/10.3390/ma15031078
Liu H, Zuo J, Nakata T, Xu C, Wang G, Shi H, Tang G, Wang X, Kamado S, Geng L. Effects of La Addition on the Microstructure, Thermal Conductivity and Mechanical Properties of Mg-3Al-0.3Mn Alloys. Materials. 2022; 15(3):1078. https://doi.org/10.3390/ma15031078
Chicago/Turabian StyleLiu, Huafeng, Jing Zuo, Taiki Nakata, Chao Xu, Guisong Wang, Hailong Shi, Guangze Tang, Xiaojun Wang, Shigeharu Kamado, and Lin Geng. 2022. "Effects of La Addition on the Microstructure, Thermal Conductivity and Mechanical Properties of Mg-3Al-0.3Mn Alloys" Materials 15, no. 3: 1078. https://doi.org/10.3390/ma15031078