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

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[1] Rogers, Wayne P.
[2] Nemat-Nasser, S.
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Rogers, Wayne P. | 1600年
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Transformation plasticity in magnesia partially stabilized zirconia (Mg-PSZ) was 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 increased 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 do not contribute significantly to plastic deformation.
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