Microstructure and Corrosion Resistance of AlCoCrFeNiSix High-entropy Alloy Coating by Laser Cladding

doi:10.12442/j.issn.1002-185X.20210484

Home > Archive>Volume 51, Issue 6, 2022 >2199-2208. DOI:10.12442/j.issn.1002-185X.20210484

Microstructure and Corrosion Resistance of AlCoCrFeNiSix High-entropy Alloy Coating by Laser Cladding
DOI:
                        10.12442/j.issn.1002-185X.20210484
                    
Author:
                        Liu Hao1,2Liu Hao
China University of Mining and Technology,School of Mechanical and Electrical Engineering；China University of Mining and Technology, Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment
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Gao Qiang1Gao Qiang
China University of Mining and Technology,School of Mechanical and Electrical Engineering
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Hao Jingbin1Hao Jingbin
China University of Mining and Technology,School of Mechanical and Electrical Engineering
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Zhang Guozhong1Zhang Guozhong
China University of Mining and Technology,School of Mechanical and Electrical Engineering
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Hu Yuan1Hu Yuan
China University of Mining and Technology,School of Mechanical and Electrical Engineering
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Yang Haifeng1Yang Haifeng
China University of Mining and Technology,School of Mechanical and Electrical Engineering
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Affiliation:1.China University of Mining and Technology,School of Mechanical and Electrical Engineering;2.China University of Mining and Technology, Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment
Clc Number:TG174;TN249
Fund Project:National Natural Science Foundation of China(Grant No. 51905534)、Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

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Abstract:

AlCoCrFeNiSix(x=0.1，0.2，0.3，0.4，0.5) high-entropy alloy coatings were prepared on the surface of AISI 304 stainless steel. The effect of Si element on the microstructure and properties of the high-entropy alloy was investigated using X-ray diffractometer (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS), transmission electron microscope (TEM), Vickers hardness tester, and electrochemical workstation. The results show that the high-entropy alloy coatings consist of solid-solution grains with body-centered cubic (BCC) lattice. With the increase of the Si element content, the substitutional solid solution of Si element causes the crystal lattice to shrink, and the crystal grains are gradually refined. Besides, the AlNi phase with nano-scale spherical shape is dissolved in the crystal grains, and a small amount of Cr23C6 carbides are precipitated along the grain boundaries. The evolution of the microstructure leads to an increase in the microhardness of the coating, with the maximum hardness reaching 848.1 HV0.3. The thermodynamic corrosion tendency and uniform corrosion rate of AlCoCrFeNiSix high-entropy alloy coating are lower than the AISI 304 stainless steel. The doping of Si element improves the repair ability and stability of the passivation film, and promotes the corrosion mechanism to transform from pitting corrosion developed by autocatalysis to intergranular corrosion.

Key words:laser technique; laser cladding; high-entropy alloy; microstructure; microharness; corrosion mechanism

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[Liu Hao, Gao Qiang, Hao Jingbin, Zhang Guozhong, Hu Yuan, Yang Haifeng. Microstructure and Corrosion Resistance of AlCoCrFeNiSix High-entropy Alloy Coating by Laser Cladding[J]. Rare Metal Materials and Engineering,2022,51(6):2199~2208.]
DOI：10.12442/j. issn.1002-185X.20210484

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Received:June 02,2021
Revised:July 27,2021
Adopted:August 06,2021
Online: July 06,2022
Published: June 29,2022

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