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|Evaluation of Microstructure and Hardness of Novel Al-Fe-Ni Alloys with High Thermal Stability for Laser Additive Manufacturing
|Loginova, I. S.
Sazerat, M. V.
Loginov, P. A.
Pozdniakov, A. V.
Popov, N. A.
Solonin, A. N.
|Evaluation of Microstructure and Hardness of Novel Al-Fe-Ni Alloys with High Thermal Stability for Laser Additive Manufacturing / I. S. Loginova, M. V. Sazerat, P. A. Loginov, et al. — DOI 10.1007/s11837-020-04321-2 // JOM. — 2020. — Vol. 72. — Iss. 11. — P. 3744-3752.
|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. © 2020, The Minerals, Metals & Materials Society.
HEAT RESISTANT MATERIAL
HIGH COOLING RATES
HIGH THERMAL STABILITY
LASER ADDITIVE MANUFACTURING
|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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