Preparation of large single grains of the quasicrystalline icosahedral Al-Cu-Fe psi phase

A cyclic heat-treatment process was used to prepare single grains of the quasicrystalline icosahedral phase, psi-Al65Cu23Fe12 Alloys of appropriate composition are melted and chill cast into copper molds. Multiple cyclic heat treatments at successively higher temperatures below 860 degrees C, the peritectic decomposition temperature of the quasicrystal phase, are used to enhance the growth of the psi phase. Single grains up to 10 mm x 5 mm x 5 mm have been prepared.