Microstructure and properties of high speed laser clad Al-Si coating on Mg-Gd-Y-Zr magnesium alloy

doi:10.13251/j.issn.0254-6051.2023.01.038

Abstract

Abstract: Microstructure and properties of Al-Si coating prepared on the surface of Mg-Gd-Y-Zr magnesium alloy by high-speed laser cladding process were characterized by means of optical microscope (OM), X-ray diffractometer (XRD), scanning electron microscope (SEM) and electrochemical test and wear test, and the metallurgical mechanism and wear and corrosion resistance of the substrate and Al-Si coating were analyzed. The results show than the microstructure of clad coating consists of dendritic α-Mg solid solution, irregular massive Mg₂Si, α-Mg+Mg₁₇Al₁₂ eutectic and petal-like Mg₂Al₃. Due to grain refinement strengthening and secondary phase strengthening, the hardness of the Al-Si coating reaches 160 HV0.1. In addition, compared with the magnesium alloy substrate, the corrosion resistance of the Al-Si coating is significantly improved, the self-corrosion potential is increased by about 200 mV, the self-corrosion current density is reduced by 2 orders of magnitude, and the anti-wear effect is increased by 30.7%, which indicate that the Al-Si coating is expected to become a more promising wear and corrosion resistant protective coatings for rare earth magnesium alloys.

Key words: rare earth magnesium alloy, laser cladding, Al-Si coating, microstructure, corrosion resistance, wear resistance

CLC Number:

TG174.4

Yang Jiaoxi, Huang Kai, Wu Feiyu, Sun Hongbo, Yang Daijun, Li Shuguang, Ge Xueyuan, Wang Miaohui. Microstructure and properties of high speed laser clad Al-Si coating on Mg-Gd-Y-Zr magnesium alloy[J]. Heat Treatment of Metals, 2023, 48(1): 217-223.

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