Deformation Behavior of Alumina at Elevated Temperatures

摘要: The thermomechanical behavior and microstructural observations of several polycrystalline alumina bodies varying from 2–80 µm in grain size with typical purities ⩾99% tested compression at T ⩾1210°C are presented. mechanical is considered terms these results similar investigations the sapphire bicrystals. Plastic deformation observed to be related dislocations, twinning and/or boundary shear. In general, decreasing gives rise a transition mechanisms leads increased strength. Impurities, however, strongly modify this relationship instrumental enhancing shear processes alumina.