采用不同功率（2.5，3.0 kW）的高能激光将质量比为1.0：3.0：0.5的铝、钛和TiB₂混合粉熔覆在AZ31镁合金表面，研究了该熔覆层的显微组织、物相组成、硬度和耐腐蚀性能。结果表明：在激光熔覆过程中，铝与钛反应生成了Al₃Ti相，与镁在激光功率2.5 kW下反应生成Al_0.56Mg_0.44相，在激光功率3.0 kW下生成Al₁₂Mg₁₇相，TiB₂仍保持原来的晶体结构；与激光功率2.5 kW下的相比，激光功率3.0 kW下熔覆层中的Al₃Ti相更细小，且熔覆层与镁合金基体之间形成了共晶层，呈现出更好的冶金结合；激光功率对熔覆层的硬度影响较小，熔覆层硬度均随距表面距离的增大先增后降；激光熔覆可以有效提高镁合金基体的耐腐蚀性能，在激光功率3.0 kW下熔覆层的耐腐蚀性能优于激光功率2.5 kW下的。

Mixed powders of aluminum, titanium, TiB₂ with mass ratio of 1.0:3.0:0.5 were cladded on surface of AZ31 magnesium alloy by using a high energy laser with different powers (2.5, 3.0 kW). The microstructure, phase composition, hardness and corrosion resistance of the cladding layer were studied. The results show that during the laser cladding, the aluminum reacted with the titanium to form Al₃Ti phase. Meanwhile, the aluminum reacted with the magnesium to form Al_0.56Mg_0.44 phase and Al₁₂Mg₁₇ phase at the laser powers of 2.5 kW and 3.0 kW, respectively. The TiB₂ retained the original crystal structure. The cladding layer had a finer Al₃Ti phase at the laser power of 3.0 kW than at the laser power of 2.5 kW, and showed a better metallurgical bonding by the formation of a eutectic structure layer between the cladding layer and the magnesium alloy substrate. The laser power had little influence on the hardness of the cladding layer; the hardness increased and then decreased with the distance to the surface increasing. The laser cladding can effectively improve the corrosion resistance of AZ31 magnesium alloy. The corrosion resistance of the cladding layer at the laser power of 3.0 kW was better than that at the laser power of 2.5 kW.