Accession Number:

ADA232034

Title:

Mechanistic Studies of Pressure-Assisted Superplasticity of Structural Ceramics

Descriptive Note:

Annual rept. Nov 1989-Nov 1990

Corporate Author:

MICHIGAN UNIV ANN ARBOR

Personal Author(s):

Report Date:

1990-12-01

Pagination or Media Count:

4.0

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.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE