中文摘要：

采用激光引燃自蔓延技术合成铝-钛-硼中间合金，利用此中间合金可对ZL108铝合金组织进行细化，研究了激光辐照参数对中间合金和铝合金显微组织的影响。结果表明：通过对激光器工作参数的调整，可制备出具有TiAl3和TiB2颗粒含量适中、弥散分布的中间合金；在本试验条件下，激光功率1200W、照射1．0S时，生成粒径约为1μm、弥散分布的TiB2，长度约10μm、均匀分布的长条状TiAl3，此时中间合金的细化效果最佳，铝晶粒平均尺寸为55μm。

英文摘要：

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 10μm; the microstructure of the master alloy was fine and the refinement effect was the best with the average Al grain size of 55 μm.