Laser cladding of Ni-based alloy/Y2O3 (Yttrium Oxide) powder on 6061 aluminum alloy was carried out using 3 kW CW Nd:YAG laser to strengthen and improve hardness and corrosion resistance of substrate. Metal matrix composite composed of aluminum substrate, Ni-based alloy, refining and dispersion strengthening Y2O3, and particle hardening W, Cr was obtained. The microstructure and morphology, phase identification, element diffusion, and composition analysis of the Ni-based alloy/Y2O3-deposited metal and deposited metals/6061 aluminum substrate interface were examined using scanning electron microscopy (SEM), Electron Probe Micro-analyzer (EPMA) with energy-dispersive spectrometer (EDS) analysis. The micro-hardness distribution and corrosion-resistance property were investigated also. The results showed: (1) with the addition of Y2O3, more fine microstructures consisted of isometric crystal, white acicular crystal, and fringe crystal, primary phases were mainly Ni3Al, NiAl, NiAl3, W, α-Al, and Cr x C. (2) Micro-hardness of deposited metals was 780–1100 HV0.2 and distributed smoothly near interface. The corrosion rate of aluminum substrate was nearly twice that of deposited metals with addition of Y2O3.
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机译：使用3 kW CW Nd：YAG激光对6061铝合金进行Ni基合金/ Y 2 O 3 （氧化钇）粉末的激光熔覆，以增强和改进基材的硬度和耐腐蚀性。得到了由铝基体，Ni基合金，细化和弥散强化的Y 2 O 3 以及颗粒硬化W，Cr组成的金属基复合材料。 Ni基合金/ Y 2 O 3 沉积金属和沉积金属/ 6061铝基体界面的微观结构，形貌，相识别，元素扩散和成分分析使用扫描电子显微镜（SEM），电子探针微分析仪（EPMA）和能量分散光谱仪（EDS）分析进行了分析。还研究了显微硬度分布和耐腐蚀性。结果表明：（1）加入Y 2 O 3 后，由等轴晶体，白色针状晶体和条纹晶体组成的显微组织更加细化，主要为第一相。 Ni 3 Al，NiAl，NiAl 3 ，W，α-Al和Cr x C。 （2）沉积金属的显微硬度为780-1100 HV 0.2 ，并在界面附近平稳分布。加入Y 2 O 3 后，铝基板的腐蚀速率几乎是沉积金属的两倍。
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