Effect of Ni on Microstructure and Mechanical Properties of Bulk Nanocrystalline Fe-Al Based Alloys Prepared by Aluminothermic Reaction

Abstract:

Bulk nanocrystalline Fe-Al based alloys with 5, 10 and 15 wt. % Ni were prepared by aluminothermic reaction. The alloys were analyzed by electron probe microanalyzer, X-ray diffraction and transmission electron microscope. Compressive yield strength and hardness of the alloys were tested. The experimental results showed that all of the alloys consisted of Fe-Al-Ni matrix and small amount of Al₂O₃ sphere. The matrix phases of the alloys with 5 and 10 wt. % Ni had disordered α-Fe solid solution, while the matrix phases of the alloys with 15 wt. % Ni had disordered α-Fe solid solution, NiAl phase and Fe₃AlC_x phase. Average grain sizes of the matrix phases of the alloys were about 20 nm. The alloys with 5 wt.% Ni had the best plasticity, but the alloys with 15 wt. % Ni had the highest yield strength and hardness. Yield strength of those alloys is higher than that of coarse-grained Fe₃Al.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 715-721
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.715
• Online since: February 2013
• Authors: Pei Qing La, Yu Peng Wei, Yang Yang, Hong Ding Wang, Ya Ping Bai
• Keywords: Aluminothermic Reaction, Bulk Nanocrystalline, Mechanical Property

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