Abstract

A series of AlxCrFeNi2.5Mo1-x high-entropy alloys (HEAs) were prepared by vacuum arc melting. The effects of Al/Mo content on phase, microstructure, mechanical and corrosion properties of as-cast AlxCrFeNi2.5Mo1-x alloys were investigated. With the increase of Al content, the phases of AlxCrFeNi2.5Mo1-x alloys evolve from FCC + σ phase (x = 0, 0.2) to FCC + BCC + σ phase (x = 0.5, 0.8) and finally to FCC + BCC phase (x = 1.0) and the microstructure evolves from typical hypoeutectic composed of the eutectic lamellar and interdendrite structure to hypereutectic composed of dendritic and lamellar eutectic structure. Among all the alloys, the Al1.0CrFeNi2.5 alloy exhibits excellent comprehensive mechanical properties with the yield strength, ultimate tensile strength, elongation and hardness of 502 MPa, 1090 MPa, 16.8% and 336 HV, respectively. Moreover, Mo element is beneficial to improving the pitting corrosion resistance of AlxCrFeNi2.5Mo1-x alloys in 3.5 wt.% NaCl solution but it could promote the formation of σ phase, which leads to an uneven distribution of Cr elements and reduce the resistance to localized corrosion.

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