Microstructures and Mechanical Properties of Al-2Fe-xCo Ternary Alloys with High Thermal Conductivity
Abstract
:1. Introduction
2. Materials and Methods
2.1. Preparation of Samples
2.2. Measurements
3. Results and Discussion
3.1. XRD Results
3.2. Microstructure Characterization
3.3. Conductivity Performance of Al-2Fe-xCo Ternary Alloys
3.4. Mechanical Properties of Al-2Fe-xCo Ternary Alloys
3.5. The Correlation between Thermal Conductivity and Mechanical Properties
4. Conclusions
- (1)
- The addition amount of Co in the range from 0 to 0.3% can transform the morphology of primary Al3Fe phases from long needles to fine particles. The thermal conductivity of the Al-2Fe matrix would slightly increase from 203 W/(m·K) to 208 W/(m·K).
- (2)
- Because of the elimination of lattice defects and spheroidization of Al3Fe phases, the thermal conductivity of annealed Al-2Fe-xCo alloys is higher than that of as-cast alloys. After cool rolling with 80% deformation, the thermal conductivity of alloys slightly increases due to the breaking down of Al2FeCo phases.
- (3)
- Linear fitting was conducted to match this relationship for Al-2Fe-xCo ternary alloys in different states. The best fitting effect was obtained when the intercept was 6.96. In other words, the Lorentz number (L) is equal to 2.34 × 10−8 V−2K−2 for the Al-2Fe-xCo alloys.
- (4)
- The UTS and EL of the Al-2Fe-0.5Co alloy were close to 140 MPa and 22.0%, respectively, i.e., about 35% and 69% higher than those of the matrix Al-2Fe alloy. The improvement of mechanical properties was attributed to the refinement of α-Al grains and second phase strengthening.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Luo, G.; Huang, Y.; Li, C.; Huang, Z.; Du, J. Microstructures and Mechanical Properties of Al-2Fe-xCo Ternary Alloys with High Thermal Conductivity. Materials 2020, 13, 3728. https://doi.org/10.3390/ma13173728
Luo G, Huang Y, Li C, Huang Z, Du J. Microstructures and Mechanical Properties of Al-2Fe-xCo Ternary Alloys with High Thermal Conductivity. Materials. 2020; 13(17):3728. https://doi.org/10.3390/ma13173728
Chicago/Turabian StyleLuo, Gan, Yujian Huang, Chengbo Li, Zhenghua Huang, and Jun Du. 2020. "Microstructures and Mechanical Properties of Al-2Fe-xCo Ternary Alloys with High Thermal Conductivity" Materials 13, no. 17: 3728. https://doi.org/10.3390/ma13173728