Mechanistic studies of pressure-assisted superplasticity of structural ceramics. Annual report Nov 89-Nov 90

Technical Report · Sat Dec 01 00:00:00 EST 1990

OSTI ID:5532168

Chen, I W

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.

• Research Organization: Michigan Univ., Ann Arbor, MI (USA)
• OSTI ID: 5532168
• Report Number(s): AD-A-232034/9/XAB; CNN: AFOSR-87-0289
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SILICON NITRIDES
DEFORMATION
MICROSTRUCTURE
ZIRCONIUM OXIDES
CERAMICS
CONTROL
CORRELATIONS
DUCTILITY
GRAIN BOUNDARIES
GRAIN SIZE
GRAPHS
HIGH TEMPERATURE
MATERIALS WORKING
MOBILITY
NUMERICAL ANALYSIS
PLASTICITY
SPACE CHARGE
ZIRCONIUM
CHALCOGENIDES
CRYSTAL STRUCTURE
ELEMENTS
FABRICATION
MATHEMATICS
MECHANICAL PROPERTIES
METALS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
SILICON COMPOUNDS
SIZE
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ZIRCONIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies