Microstructure and corrosion properties of AlxCuFeNiCoCr(x=0.5, 1.0, 1.5, 2.0) high entropy alloys with Al content

AlxCoCrFeNiCu (x = 0.5, 1.0, 1.5, 2.0) high entropy alloy was prepared by powder metallurgy method. The effect of Al content x on microstructure and corrosion properties of high entropy alloy was systematically studied. The results show that the high entropy alloy has a simple crystal structure and the distribution of components is uniform. The increase of Al content promotes the formation of the BCC structural phase. When the Al mole content is less than 1.0, the main phase is FCC and the dendrite is FCC2 and the inter-dendritic is FCC1. When the Al mole content is higher than 1.0, the main phase is BCC and the second phase is FCC1. The electrochemical corrosion properties of Al1.0CoCrFeNiCu high entropy alloy is good, and the corrosion mainly starts in the form of spot corrosion. In general, the alloy has poor resistance to nitric acid corrosion, and FCC structural phase has better resistance to nitric acid corrosion than BCC structural phase. (c) 2022 Published by Elsevier B.V.

Automated summary

In this study, AlxCoCrFeNiCu high entropy alloy was prepared using the powder metallurgy method. The effect of Al content on the microstructure and corrosion properties of the alloy was systematically investigated. The results showed that increasing Al content promoted the formation of the BCC structural phase. The Al1.0CoCrFeNiCu high entropy alloy exhibited good electrochemical corrosion properties, with corrosion primarily starting in the form of spot corrosion. The FCC structural phase demonstrated better resistance to nitric acid corrosion compared to the BCC structural phase.