辐照参数对激光引燃自蔓延合成Al-Ti-C中间合金的影响

Influence of Irradiation Parameters on Microstructures of Al-Ti-C Master Alloys by Laser-Induced Self-Propagating High-Temperature Synthesis (SHS)

采用激光引燃自蔓延高温合成技术制备Al-Ti-C中间合金,研究了改变激光辐照参数对合成Al-Ti-C中间合金显微组织结构的影响,并用所制备的中间合金对工业纯铝进行细化试验。结果表明:激光辐照时间为1.0s、功率控制在1000W时,制备的Al-Ti-C中间合金生成TiAl3和TiC粒子弥散分布、TiAl3直径在1.5μm左右,TiC粒子直径为1μm。向工业纯铝中加入0.1%的Al-Ti-C中间合金具有最佳的细化效果,细化后晶粒的尺寸为120μm。

Al-Ti-C master alloys were prepared by laser-induced self-propagating high-temperature synthesis （SHS）. The influence of different irradiation parameters of the laser on the microstructure of synthesized product was investigated, and the refinement effect of the obtained master alloy for commercially pure aluminium is also evaluated. The results show that the laser irradiation parameters have significant influence on the microstructure of the Al-Ti-C master alloys. Under the condition of the laser irradiation time 1.0 s and the power in 1000 W, the microstructures of prepared Al-Ti-C master alloys are composed of the granular TiAl3 and TiC, which are dispersive. The diameter of TiC is about 1μm, and that of the granular TiAl3 is about 1.5 μm. The 0.1% addition of this master alloy to the molten commercially pure aluminium is most excellent; the average grain size is 120 μm after refinement.