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TiC_x contained Al–Ti–C is a kind of grain refiner for Al alloys. In this work, the influence of C/Ti stoichiometry, i.e. the x value in TiC_x on grain refinement efficiency was investigated. TiC_x particles have been obtained in five Al–5Ti–m C(m = 0.1, 0.5, 0.8, 1, 1.25) master alloys and the x values were measured to be0.72, 0.75, 0.79, 0.81 and 0.8, respectively. It was found that the refinement performance of the master alloys had a close relationship with the x value of TiC_x . The Al–5Ti–m C alloy with lower-x TiC_x shows better refinement efficiency and anti-fading capability. It is supposed that TiC_x particles with lower x are more preferred to release Ti atoms during nucleating process and have a better Ti-absorbing capability.This contributes to the Ti-rich zone formation at TiC_x /melt interface, thus enhancing the refinement and anti-fading capability.
TiC_x contained Al-Ti-C is a kind of grain refiner for Al alloys. In this work, the influence of C / Ti stoichiometry, ie the x value in TiC_x on grain refinement efficiency was investigated. TiC_x particles have been obtained in five Al It was found that the refinement performance of the 5Ti-m C (m = 0.1, 0.5, 0.8, 1, 1.25) master alloys and the x values were measured to be 0.72, 0.75, 0.79, 0.81 and 0.8, respectively master alloys had a close relationship with the x value of TiC_x. The Al-5Ti-m C alloy with lower-x TiC_x shows better refinement efficiency and anti-fading capability. It is that that TiC_x particles with lower x are more preferred to release Ti atoms during nucleating process and have a better Ti-absorbing capability. This contributes to the Ti-rich zone formation at TiC_x / melt interface, thereby enhancing the refinement and anti-fading capability.