Microstructure and properties of laser clad AlxNbMn2FeMoTi0.5 high-entropy alloy composite coatings

doi:10.13251/j.issn.0254-6051.2021.06.030

Abstract

Abstract: Laser cladding technology was used to prepare the Al_xNbMn₂FeMoTi_0.5 high-entropy alloy coatings on the Q235 steel substrate. It was expected to improve the hardness and the wear resistance of the surface layer of cutting tool suitable for dry cutting technology. After preliminary selecting, the Al_xNbMn₂FeMoTi_0.5 (x=1,1.5,2) high-entropy alloy coating system was mainly studied, and the phase structure, microstructure and specific element distribution of the Al_xNbMn₂FeMoTi_0.5 alloy coatings with different Al content were analyzed by means of XRD and 3D laser scanning imaging. The results show that for the Al_xNbMn₂FeMoTi_0.5 high-entropy alloy coatings, with the continuous addition of Al, the phase structure of the coating gradually evolves from a single BCC phase to a dual-phase BCC structure, and the grains are gradually refined. When x=2, the Al_xNbMn₂FeMoTi_0.5 high-entropy alloy coating reaches the highest hardness, with an average of 1089.6 HV0.3, which is about 5 times of that of the base material, and it has the best wear performance.When x=1.5, the Al_xNbMn₂FeMoTi_0.5 high-entropy alloy coating reaches the highest self corrosion potential and the lowest self corrosion current density, and has the best corrosion resistance.

Key words: high-entropy alloy, laser cladding, coating, microstructure, hardness, wear resistance, corrosion resistance

CLC Number:

TG135

Zhang Yi, Gu Zhen, Gao Shuailong, Xi Shengqi. Microstructure and properties of laser clad Al_xNbMn₂FeMoTi_0.5 high-entropy alloy composite coatings[J]. Heat Treatment of Metals, 2021, 46(6): 146-152.

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Microstructure and properties of laser clad Al_xNbMn₂FeMoTi_0.5 high-entropy alloy composite coatings

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