Abstract
Samples of 65 μm-grain-size AL2O3 containing 0.05 wt% Mg and 40 μm-grain-size AL2O3 containing 0.13 wt% Mg, both MgO-saturated, undergo compressive deformation in the range 1580° to 1800°C with results interpreted as diffusional creep rate-limited by grain-boundary diffusion with the Coble boundary-diffusion model giving A lower deformation rate for an unsaturated composition indicates that MgO additions enhance grain-boundary diffusion.
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