Chill cast Al–8·3Fe–0·8V–0·9Si alloy shows massive precipitate particles of various morphologies. The morphology, size, and distribution of those precipitates can be considerably modified by Mg treatment. A residual Mg level of about 0·2 wt-% is required for effective modification. Magnesium can be conveniently introduced into a superheated Al–Fe–V–Si alloy melt as either Al–20Mg or Ni–20Mg master alloy. Analysis by EDX of the complex aluminide and silicide precipitates have confirmed that Mg and Ni enter into the lattice of such precipitates.
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