铝合金表面激光熔覆原位自生TiC增强金属基复合材料涂层

以Ti,SiC混合粉末作为预置合金涂层，采用2kW连续Nd:YAG固体激光器进行激光熔覆处理，在6061铝合金表面借助于接触反应法制备原位生成TiC颗粒增强Al-Ti复合材料涂层。试验结果表明：采用适合的激光辐照工艺参数，可获得增强相TiC弥散分布，以Ti-Al金属间化合物及Al过饱和固溶体为主要组成相的复合材料熔覆层组织。TiC颗粒与复合材料基体润湿良好，熔覆层结晶致密，与6061铝合金基材呈良好的冶金,珂明显地改善铝合金的表面性能。

An In-situ Formed TiC Particle Reinforcement Composite Coating Induced by Laser Cladding on Aluminium Alloy

Metal matrix composite (MMC) surface layer have been formed on 6061 aluminium alloy surface by laser cladding of using a 2kW continuous wave (CW) Nd YAG laser. The TiC particle reinforced Al Ti composite coating was prepared by in situ contact reaction with preplaced powder mixtures of Ti and SiC. The formation mechanism of TiC particles has been studied. It was found that composite coating consisting of TiC particles dispersed in coating matrix could be obtained using the correct ratio of Ti to SiC powders and a laser power density. Compound material cladding coating mainly consists of Ti Al intermetallic compound and Al supersaturated solid solution. The coating was characterized by good metallurgical bonding between the coating and the substrate, good wettability between the reinforcement TiC and the coating matrix,and a fine grain structure. The results show that the composite coating greatly enhances the surface hardness.