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This study examined pressure consolidation of amorphous Al 2 O 3 -15 mol% Y 2 O 3 powders prepared by co-precipitation and spray pyrolysis. The two amorphous powders had similar true densities and crystallization sequences. Uniaxial hot pressing was carried out at 4501-6001C with a moderate pressure of 750 MPa. The co-precipitated powder could be hot pressed to a maximum relative density of 98% and remained amorphous. Pressure adversely affected the densification of the spray-pyrolyzed powder by favoring an early crystallization of c-Al 2 O 3 phase at 5801C. Plastic deformation of the amorphous phase is believed to be responsible for the large densification of the amorphous powders. J ournal