Compressive Properties of Yttrium Oxide

Compressive properties of polycrystalline yttrium oxide (Y₂O₃) were studied by slow-strain-rate experiments (ε= 5.7 × 10^–6 s^?1) between room temperature and 1600°C. It was shown that Y₂O₃ fails in a brittle manner up to 1000°C, and at 1200°C and above plastic deformation becomes dominant. Plastic deformation of Y₂O₃ takes place exclusively by dislocation motion. Maximum stress, yield stress, and elastic modulus decrease with increasing temperature, although the decrease at temperatures above 1000°C is much more pronounced.