A new type of composite refiner Ti/TiCN is prepared by loading submicron-TiCN particles onto Ti micron-particles and added to industrial pure aluminium. Refining mechanism has been characterised in detail by optical microscopy, scanning electron microscopy and transmission electron microscopy coupled with energy disperse X-ray spectra. These experimental results show that Ti/TiCN inoculation is more effective in refining pure aluminium than Ti and TiCN added separately. The relationship between grain size and growth restriction factors of aluminium matrix containing Ti/TiCN refiner is d = 70.2 + 1190.8/Q. According to the free growth theory, aluminium matrix with Ti/TiCN inoculation has the largest solidification driving force to promote grain nucleation under the same growth restriction factors (Q = 0.5,1, 5, 12, 20 K) compared to Ti and TiCN refiners.

通过将亚微米TiCN颗粒负载在Ti微米颗粒上并添加到工业纯铝中，制备了一种新型复合细化剂Ti/TiCN。已通过光学显微镜、扫描电子显微镜和透射电子显微镜结合能量色散 X 射线光谱对精炼机理进行了详细表征。这些实验结果表明，Ti/TiCN 孕育在精炼纯铝方面比单独添加 Ti 和 TiCN 更有效。含Ti / TiCN精炼剂的铝基晶粒尺寸与生长限制因子之间的关系为d  = 70.2 + 1190.8 / Q. 根据自由生长理论， 与 Ti 和 TiCN 细化剂相比，在相同的生长限制因子 ( Q = 0.5,1,5,12,20 K)下，Ti/TiCN 孕育的铝基体具有最大的促进晶粒形核的凝固驱动力。