Transformation plasticity at high strain rate in magnesia-partially-stabilized zirconia

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb05105.x· OSTI ID:6785447

Rogers, W P ^[1]; Nemat-Nasser, S

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1. Colorado Univ., Boulder, CO (USA). Dept. of Mechanical Engineering

Transformation plasticity in magnesia- partially-stabilized zirconia (Mg-PSZ) is studied using a split Hopkinson pressure bar modified for ceramic materials. Axial and transverse strains are measured under uniaxial compressive loading at a strain rate of 250/s. The transformation yield stress is found to increase from 900 MPa under quasi-static loading to 1.2 GPa at high strain rate. Post-yield deformation is characterized by shear and volumetric plastic strains up to 1.2%. During unloading, the axial and transverse plastic strains are partially recovered while the volume is conserved. Axially oriented microcracks are observed but they do not contribute significantly to plastic deformation in Mg-PSZ.

• OSTI ID: 6785447
• Journal Information: Journal of the American Ceramic Society; (USA), Vol. 73:1; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ZIRCONIUM OXIDES
CRACK PROPAGATION
GRAIN ORIENTATION
MAGNESIUM OXIDES
PHASE TRANSFORMATIONS
PLASTICITY
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL STRUCTURE
MAGNESIUM COMPOUNDS
MECHANICAL PROPERTIES
MICROSTRUCTURE
ORIENTATION
OXIDES
OXYGEN COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies