Abstract
The destabilisation of TiC and its application on the grain refinement of Mg–Al alloys is studied by the experiment and CASTEP calculation. Al 4C 3-containing refiners for Mg–Al based alloys are easily prepared in the liquid Al–Ti–C–Si alloy, but the TiAl x Si y formed simultaneously will poison the refining efficiency of Al 4C 3. In contrast to Si, B element can improve the stabilization of TiC in the Al melt; however, the addition of B is essential in Al 4C 3-containing refiners prepared by the destabilisation of TiC in order to transfer the Ti into TiB 2 particles. In this case, the poisoning effect of Ti can be avoided and the formed Al 4C 3 can be fully worked as the substrates for α-Mg.
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