Abstract
Superplasticity in metals has received a considerable amount of attention in recent years. However, the possibility that ceramic materials also may show anomalous deformational properties coincident with a phase transformation has been neglected. Examples will be given where ready deformation of ceramic bodies may occur with (1) simple allotropic phase transformation, (2) eutectic exsolution, (3) exsolution from solid solution, (4) exsolution by decomposition of mixed crystal systems, and (5) simple decomposition producing one or more solid-phase products and a gas phase; these will be related to the better known processes in metallic systems. It will be shown that the unifying feature of these phenomena in both metals and ceramics is achievement and retention of extremely fine crystal size during deformation.
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