Mechanistic Studies of Pressure-Assisted Superplasticity of Structural Ceramics
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1990
- Accession Number
- ADA232034
Entities
People
- I-wei Chen
Organizations
- University of Michigan