Effect of Cr content on corrosion behavior of CrMnFeNi high entropy alloys

Abstract

The effect of Cr content on the microstructure and corrosion resistance of CrxMnFeNi(x=0.8, 1.0, 1.2, 1.5) high entropy alloys was studied by using XRD, SEM/EDS, EBSD and electrochemical testing. The results show that Cr0.8 MnFeNi high entropy alloy exhibits single FCC phase structure, while CrxMnFeNi(x=1.0, 1.2, 1.5) high entropy alloys show FCC+BCC dual phase structure, and the BCC phase ratio of dual phase alloys increases with the increase of Cr content.The corrosion resistance of high entropy alloys gradually increases with the decrease of Cr content.Among them, Cr0.8MnFeNi high entropy alloy has the best corrosion resistance, because the composition of the alloy is more uniform.In addition, CrxMnFeNi high entropy alloys have extensive passive region and obvious pseudo passive region in 0.5 mol/L H2SO4 solution, which indicates the alloys have greater research value and development potential in corrosion resistance.

Keywords

• cr content
• high entropy alloy
• microstructure
• electrochemical test
• corrosion resistance