Abstract
The microstructure and phase composition of cast and laser-melted Al-Fe-Ni alloys were investigated. Two main phases—Al3(Ni,Fe) and Al9FeNi—were formed in the as-cast state. A fine microstructure without porosity or solidification cracks was observed in the Al-Fe-Ni alloys after laser treatment. The hardness of the laser-melted alloys was 2.5–3 times higher than the hardness of the as-cast alloys owing to the formation of an aluminum-based solid solution and fine eutectic particles. The formation of the primary Al9FeNi phase was suppressed as a result of the high cooling rate. Annealing these alloys at temperatures less than 300°C demonstrated the high thermal stability of the microstructure while maintaining the hardness. The Al-Fe-Ni alloys investigated in this study are promising heat-resistant materials for additive manufacturing because of their fine, stable structure, and the low interdiffusion coefficients of Fe and Ni.
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Acknowledgements
Loginova I.S. would like to thank Dr. Solonin A.N. for valuable discussions regarding the structure formation process. This project and all the experiments were funded by RFBR, Project Number 19-38-60037.
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Loginova, I.S., Sazerat, M.V., Loginov, P.A. et al. Evaluation of Microstructure and Hardness of Novel Al-Fe-Ni Alloys with High Thermal Stability for Laser Additive Manufacturing. JOM 72, 3744–3752 (2020). https://doi.org/10.1007/s11837-020-04321-2
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DOI: https://doi.org/10.1007/s11837-020-04321-2