Boride and titanium aluminide particles from various master alloys have been studied by metallography, electron microscopy, and X-ray diffraction in order to reveal the role of these particles in the grain refinement of aluminium. It has been found that TiB2, (TiAl)B2, AlB2J and TiAl3 form during the production of the master alloy. The size and morphology of the borides is quite independent of the production of the master alloy. A superstructure in the TiB2 lattice develops with holding time, indicating a stable ternary Ti–Al–B phase. A preferred orientation relationship was found to exist between the Al3Ti crystals and the aluminium matrix.
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