Fractographic Evidence of Multiple Slip in Deformed Hot-Pressed Spinel
Spinel is a refractory oxide ceramic which, in principle, should meet the Taylor-von Misés criterion of five slip modes, a necessary condition for the achievement of polycrystalline plasticity without loss of structural integrity. Crystallographically, its (111) slip systems are multiple and quite comparable to those of a face-centered-cubic metal. Fractographic examinations of a spinel specimen (> 99.9% pure) previously subjected to deformation in three compressive stress cycles at 1600°C have revealed several microscopic features characteristic of polycrystalline plasticity which experimentally support the expectation of multiple slip processes in spinel ceramics.
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