Abstract
Creep behavior of polycrystalline A12O3 doped with MgO + NiO, both as‐hot‐pressed in graphite dies and additionally annealed, was determined for 1300° to 1470°C and for 1000 to 15,000 psi in compression. The deformed specimens contained intergranular separations. Creep rates were proportional to stress to the 1.1 and 1.3 powers and were independent of grain size changes occurring during creep. The suggested creep mechanism is localized plastic deformation at stress concentration points accommodated by grain‐boundary separations initiated by grain‐boundary sliding.
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