超音波音弾性法による部分安定化ジルコニアのアニール効果の評価

抄録

Acoust-elasticity is a non-destructive method not only to detect flaw in material but also to estimate quantitatively the change of microstructure. The method is often applied in the field of metallic materials but is a few in the field of ceramic materials. In the method the third order elastic constants can be obtained by measuring the ultrasonic velocities with varying the stress under uniaxial compressive loading, and seems to express material nonlinearity which caused by residual stress or the change of microstructure. In this paper, the method was applied to evaluate the degree of phase transformation in annealing of partially stabilized zirconia, in which the material was annealed for 100h at different temperatures of 200, 400 and 600°C. The third order elastic constants obtained for various temperatures showed that the material annealed in 200°C has a highly nonlinearity. This fact shows that it is possible to apply the acoust-elasticity to non-destructive evaluation of annealing effect.