Effect of annealing temperature on microstructure and corrosion resistance of AlCrMnFeNiCu0.8 high-entropy alloy

doi:10.13251/j.issn.0254-6051.2022.07.009

Abstract

Abstract: AlCrMnFeNiCu_0.8 high-entropy alloy was prepared by vacuum arc melting and were treated by vacuum annealing at 200, 400, 600, and 800 ℃ for 4 h. The microstructure and crystal structure of the alloy were characterized by means of optical microscope (OM) and X-ray diffraction (XRD). The corrosion resistance of the alloy was analyzed by means of a standard three-electrode system CHI660D electrochemical workstation. The results show that the microstructure of the alloy is Cu-rich zone and Cu-poor zone, mainly composed of Fe-Cr solid solution, Al-Ni solid solution and Cu-rich solid solution. With the increase of annealing temperature, the BCC structure is stronger and FCC structure is weaker. After anneding at 400 ℃, the alloy has the most positive self-corrosion potential (-0.584 V) and the lowest self-corrosion current density (0.6618 μA·cm^-2). After anneding at 600 ℃ and 800 ℃, the diffusion effect appears in the impedance map, which leads to the decrease of corrosion resistance of the alloy.

Key words: high-entropy alloy, microstructure, corrosion resistance, electrochemistry

CLC Number:

TG166.7

Hou Jinrui, Lu Ruoding, Bu Shaocong, Xu Shuailing, Fu Lihua, Tian Baohong. Effect of annealing temperature on microstructure and corrosion resistance of AlCrMnFeNiCu_0.8 high-entropy alloy[J]. Heat Treatment of Metals, 2022, 47(7): 52-57.

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Effect of annealing temperature on microstructure and corrosion resistance of AlCrMnFeNiCu_0.8 high-entropy alloy

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