Abstract
Superplastic elongation of fine-grained ceramics can be observed when some mechanical and microstructural requirements are satisfied at appropriate test conditions, temperature and strain rate. The phenomenon can be utilized in superplastic forming, solid-state bonding, sinter-forging, hot press, and hot-isostatic pressing. Recent advances in ceramic processing brought about superplastic ZrO 2 composites, covalent polycrystals, bioceramics, and nanocrystalline materials. Numerous works on superplasticity of ZrO 2 ceramics revealed some characteristics, microstructural features, and possible mechanisms. Attempts to achieve high-strain rate superplasticity were performed by modifying the nature of the grain boundary.
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