Mechanistic Studies of Pressure-Assisted Superplasticity of Structural Ceramics
Annual rept. Nov 1989-Nov 1990
MICHIGAN UNIV ANN ARBOR
Pagination or Media Count:
Microstructural and deformation studies have been conducted for superplastic zirconia and sialon ceramics. A methodology based on space charge concept is established for grain size control of zirconia ceramics. A direct correlation between grain boundary mobility and stress-strain curve is demonstrated. For silicon nitride ceramics, both single phase alpha and beta sialons have been shown to be superplastic, and they exhibit a novel shear- thickening behavior which is interpreted by the breakdown of interparticle structural forces at high temperatures. Deformation experiments and numerical simulations of multiaxial superplastic forming are also reported.
- Ceramics, Refractories and Glass