为了研究稀土Y元素对工业纯铝表面激光熔覆层的组织和性能的影响，在工业纯铝基体上，采用CO₂激光器制备了Al－Y合金熔覆层，利用金相显微镜、能谱分析、X射线衍射分析和显微硬度计等对熔覆层的显微组织、成分分布、物相组成和显微硬度进行了研究。由实验结果可知，Y元素显著细化了熔覆层的组织，熔覆层与基体形成良好的冶金结合；生成了含Y的新相YAl₃，Y₄Al₂O₉等铝钇金属间化合物；熔覆层区域的显微硬度43HV_0．2～58HV_0．2与基体的显微硬度30HV_0．2～40HV_0．2相比提高了50%～60%，在熔覆层表面硬度值达到最高。结果表明，通过激光熔覆Y粉可以提高工业纯铝的表面性能。

In order to improve the surface properties of aluminum,the Al-Y alloy coating was fabricated by laser cladding directly melting the preplaced Y powder on substrate. With optimum process parameters,the coating layer with good metallurgical bonding performance was formed,and the grain size in cladding layer was smaller than the substrate. The microstructure characteristics of coating layer were studied by using metallogenetic microscope,energy disperse spectroscopy,X-ray diffraction and micro-hardness analysis. The results showed that the surface modified layer consisted of some inter-metallic compound phase,such as YAl₃,Y₄Al₂O₉. The micro-hardness of the coating ranging from 43HV_0.2 to 58HV_0.2,was 50%～60% higher than that of the substrate,ranging from 30HV_0.2 to 40HV_0.2. The highest hardness was obtained in the top of the coating. It can be concluded that the surface properties of aluminum can be improved by laser cladding Y powers.