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<p>AlCoCrFeNiMo<sub><i>x</i></sub> high-entropy alloys (HEA) coating was conducted on the surface of 45-steel substrates using high-speed laser cladding (HSLC) technology. This study investigated the influence of molybdenum (Mo) on the phase structure, microstructure, and properties of the coating. The results show that the coating has a small heat-affected zone and strong metallurgical bonding with the substrate. The AlCoCrFeNiMo<sub><i>x</i></sub> HEA coating is composed of a single body-centered cubic (BCC) phase structure. The microstructure of the coating comprised columnar crystals and Mo refined the microstructure, changing from coarse to slender columnar crystals with increasing Mo content. When <i>x</i> = 0.8, the hardness of the coating is the highest, up to 860 HV, and the self-corrosion current density of the coating is the smallest, about 5.7452 × 10<sup>−7</sup>&#xa0;A&#xa0;cm<sup>−2</sup>. The inclusion of Mo increases the coating’s oxidation resistance at high temperatures. The structural integrity of the coating may still be preserved after oxidation at 1200&#xa0;°C for 90&#xa0;h. When <i>x</i> = 0.8 to 1.0, the coating has a reduced oxidation rate, and the oxidation process follows the growth kinetics curve, and Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub> are the predominant oxides on the surface.</p>

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Microstructure and Properties of AlCoCrFeNiMox High-Entropy Alloy Coating by High-Speed Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年10月7日

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  • XiuLi Yang,
  • ZhiPei Chen,
  • Jia Yang,
  • PeiXin Xu,
  • BoRui Du

摘要

AlCoCrFeNiMox high-entropy alloys (HEA) coating was conducted on the surface of 45-steel substrates using high-speed laser cladding (HSLC) technology. This study investigated the influence of molybdenum (Mo) on the phase structure, microstructure, and properties of the coating. The results show that the coating has a small heat-affected zone and strong metallurgical bonding with the substrate. The AlCoCrFeNiMox HEA coating is composed of a single body-centered cubic (BCC) phase structure. The microstructure of the coating comprised columnar crystals and Mo refined the microstructure, changing from coarse to slender columnar crystals with increasing Mo content. When x = 0.8, the hardness of the coating is the highest, up to 860 HV, and the self-corrosion current density of the coating is the smallest, about 5.7452 × 10−7 A cm−2. The inclusion of Mo increases the coating’s oxidation resistance at high temperatures. The structural integrity of the coating may still be preserved after oxidation at 1200 °C for 90 h. When x = 0.8 to 1.0, the coating has a reduced oxidation rate, and the oxidation process follows the growth kinetics curve, and Al2O3 and Cr2O3 are the predominant oxides on the surface.