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采用１０ｋＷ连续横流ＣＯ２激光器在铸造铝硅合金基底上成功地制备了表面合金化（ＬＳＡ）改性层。通过ＳＥＭ、ＴＥＭ分析、显微硬度测试及耐磨性对比试验，研究了ＬＳＡ改性涂层的显微组织结构、相组成和改性效果。结果表明：合金化涂层由γＮｉ（Ｃｒ，Ｆｅ）基体相、Ｎｉ３Ａｌ相、Ｔ（Ａｌ，Ｆｅ，Ｓｉ）相、Ｃｒ／Ｂ相、Ｃｒ２３Ｃ６相等组成，改性层的平均显微硬度为３１０～３６０ＨＶ０．０１，是基底材料的３倍以上。在不同的测试负荷下，ＬＳＡ改性层的耐磨性均比基底材料有很大的提高，相对耐磨性达１０～１２倍。另外，结合表面磨损形貌分析了ＬＳＡ改性层的磨损机理
The surface alloying (LSA) modification layer was successfully fabricated on a cast Al-Si alloy substrate by a 10kW continuous cross-flow CO2 laser. The microstructure, phase composition and modification of LSA modified coatings were studied by SEM, TEM analysis, microhardness test and abrasion resistance comparison test. The results show that the alloying coating is composed of γNi (Cr, Fe) matrix phase, Ni3Al phase, T (Al, Fe, Si) phase, Cr / B phase and Cr23C6. The average microhardness of the modified layer is 310 ~ 360HV0.01, is more than 3 times the base material. Under different test loads, the wear resistance of LSA modified layer is much higher than the base material, the relative wear resistance of 10 to 12 times. In addition, the wear mechanism of LSA modified layer was analyzed in combination with the surface wear morphology