Study on Microstructure and Properties of Laser Cladding Al-Ti-C Coating on Aluminum Alloy Surface

摘要

Al-Ti-C mixed powder was coated on the surface of Aluminum alloy, and the reinforced coating was prepared on the surface of Aluminum alloy by Nd:YAG solid-state pulse laser. By studying the effect of different laser scanning speed on coating morphology and calculation of the dilution, results show that: firstly, the cladding layer formed zigzag excellent bonding interface, and coating density, no crack, average dilution rate is only 3.5%; secondly, in situ generated enhanced Al3Ti and TiC phase, nearly at the junction of Al3Ti and TiC were 2-4 um and 1 um particle size, the cladding layer of central Al3Ti and TiC size were 6-10 um spherical grain and 3-5 um cross dendrites; finally, the coating hardness testing found that coating hardness up to 724 HV, far higher than the substrate.