Metallic amorphous phase reinforced metal matrix composites were fabricated by using infiltration casting process. Due to the high thermal stability of amorphous Ni-20.6Nb-40.2Ta (wt.%,,) and good castability of Al-6.5Si-0.25Mg (wt.%) alloy, sound composite specimens without casting defects were fabricated. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.