Abstract
Al x CoCrFeNiCu (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 interdendritic 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 Al 1.0 CoCrFeNiCu 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. • The increase of Al content promotes the formation of BCC structural phase in Al x CoCrFeNiCu high entropy alloy. • FCC second phase particles exist in Al x CoCrFeNiCu high entropy alloy and change with the increase of Al content. • Al 1.0 CoCrFeNiCu high entropy alloy has the best electrochemical corrosion performance. • Al x CoCrFeNiCu high entropy alloy FCC structure shows better resistance to nitric acid corrosion than BCC structure phase.
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