Influence of Laser Parameters on Microstructure and Property of Al-Ti-B Master Alloy Prepared by Laser-induced SHS

Self-propagating high-temperature synthesis(SHS) was ignited by the laser to synthesize Al-Ti-B master alloy,and the master alloy was used to refine ZL108 Al alloy.The influences of laser parameters on microstructure of Al-Ti-B master alloy and ZL108 alloy were analyzed.The results show that master alloy with proper TiAl3 and TiB2 particles which distributed dispersively by laser parameters adjusting.When the laser illumination time was 1.0 s and the power was 1 200 W,the distribution of TiB2 was dispersing,and the average size of TiB2 was about 1 μm.The distribution of strip-shaped TiAl3 was uniform and the length was about 10 μm;the microstructure of the master alloy was fine and the refinement effect was the best with the average Al grain size of 55 μm.