首页|High-Strain-Rate Superplastic Flow Mechanism in ZrO_2-30vol% Spinel Two-Phase Composite
High-Strain-Rate Superplastic Flow Mechanism in ZrO_2-30vol% Spinel Two-Phase Composite
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NETL
NSTL
Trans Tech Publications Ltd
High-strain-rate superplasticity (HSRS) can be attained in tetragonal ZrO_2-30vol% MgAl_2O_4 spinel composite. In order to examine the flow behavior of the two-phase composite, the standard rule of the mixture model was employed. The strain rate of the composite can be explained by the isostrain model that is predicted from the data set of Al_2O_3 doped ZrO_2 and spinel polycrystals. For the isostrain model, since the strain and strain rate are the same for ZrO_2 and spinel phases, the harder ZrQ_2 phase carries more of the stress in the composite. In order to preserve homogeneous deformation and material continuity, a concomitant accommodation process within the harder ZrO_2 grains is also necessary. For HSRS in the ZrO_2-spinel composite, therefore, the rate of deformation may be controlled by the slower dislocation recovery process limited by the lattice diffusion within harder Zr_O2 grains rather than within spinel grains.
NETL
NSTL
Trans Tech Publications Ltd
