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Evaluation of Microstructure and Hardness of Novel Al-Fe-Ni Alloys with High Thermal Stability for Laser Additive Manufacturing

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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Submitted on : Friday, December 4, 2020 - 12:52:26 PM
Last modification on : Tuesday, July 13, 2021 - 8:20:09 AM
Long-term archiving on: : Friday, March 5, 2021 - 6:55:10 PM

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I.S. Loginova, Marjolaine Sazerat, P.A. Loginov, A.V. Pozdniakov, N.A. Popov, et al.. Evaluation of Microstructure and Hardness of Novel Al-Fe-Ni Alloys with High Thermal Stability for Laser Additive Manufacturing. JOM Journal of the Minerals, Metals and Materials Society, Springer Verlag (Germany), 2020, 72, pp.3744-3752. ⟨10.1007/s11837-020-04321-2⟩. ⟨hal-02928476⟩

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