Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Analysis
3.1. Phases
3.2. Microstructure
3.3. Hardness Performance
4. Discussion
5. Conclusions
- The laser rapid solidification can effectively prevent the precipitation of the boride phase in the boron-containing HEA coatings.
- Increased additional content of the small atomic boron element can lead to an interstitial solid solution strengthening effect and improve the hardness in HEA coatings.
- Increased additional content of boron leads to a high degree of segregation of Cr and Fe in the interdendritic microstructure.
- The CoCrFeNiAl0.3Cu0.7Si0.1B0.6 coating with a simple FCC matrix has ultrahigh hardness of 502 HV0.5.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Component | Regions | Co | Cr | Fe | Ni | Al | Cu | Si |
---|---|---|---|---|---|---|---|---|
FCC Matrix | Nominal | 19.61 | 19.61 | 19.61 | 19.61 | 5.88 | 13.72 | 1.96 |
Al0.3B0.15 | DR | 23.45 | 15.64 | 16.34 | 21.34 | 7.54 | 13.45 | 2.24 |
ID | 19.54 | 23.34 | 19.98 | 20.19 | 3.65 | 11.32 | 1.98 | |
Al0.3B0.3 | DR | 21.98 | 13.26 | 15.91 | 22.64 | 7.76 | 14.78 | 2.67 |
ID | 17.74 | 26.56 | 22.87 | 17.35 | 3.56 | 10.39 | 1.53 | |
Al0.3B0.6 | MT | 26.87 | 13.87 | 19.87 | 23.45 | 9.56 | 3.82 | 2.56 |
CS | 12.04 | 19.24 | 11.43 | 12.85 | 2.89 | 41.32 | 0.23 | |
BCC Matrix | Nominal | 14.08 | 14.08 | 14.08 | 14.08 | 32.41 | 9.86 | 1.41 |
Al2.3B0.15 | DR | 14.57 | 12.09 | 15.24 | 13.65 | 34.09 | 9.04 | 1.32 |
ID | 6.71 | 26.06 | 18.72 | 10.34 | 29.93 | 6.86 | 1.38 | |
Al2.3B0.3 | DR | 15.18 | 10.44 | 19.08 | 15.48 | 28.41 | 10.14 | 1.27 |
ID | 6.48 | 43.44 | 13.11 | 12.89 | 17.40 | 5.46 | 1.24 | |
Al2.3B0.6 | DR | 16.54 | 5.91 | 20.01 | 11.31 | 39.79 | 4.95 | 1.49 |
ID | 5.42 | 51.71 | 3.66 | 26.84 | 7.28 | 3.11 | 1.98 |
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He, Y.; Zhang, J.; Zhang, H.; Song, G. Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding. Coatings 2017, 7, 7. https://doi.org/10.3390/coatings7010007
He Y, Zhang J, Zhang H, Song G. Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding. Coatings. 2017; 7(1):7. https://doi.org/10.3390/coatings7010007
Chicago/Turabian StyleHe, Yizhu, Jialiang Zhang, Hui Zhang, and Guangsheng Song. 2017. "Effects of Different Levels of Boron on Microstructure and Hardness of CoCrFeNiAlxCu0.7Si0.1By High-Entropy Alloy Coatings by Laser Cladding" Coatings 7, no. 1: 7. https://doi.org/10.3390/coatings7010007