Description: In this progress report we begin by highlighting our work on the enhancement of interfacial cohesion in alumina by small additions of transition metals. A possible mechanism by which grain boundaries in ceramic can be strengthened is proposed towards the end of this report and is further elaborated in the continuation proposal. The results support the view that the addition of zirconia lowers the interfacial energy in alumina. The lower interface energy has the effect of (1) increasing interfacial cohesion, (2) increasing the activation energy for diffusional transport required for superplastic deformation and sintering, and (3) delaying nucleation in the crystallization of an amorphous alloy of alumina and zirconia.
Date: December 1, 1991
Creator: Raj, R.
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