Abstract
Applications of superplastic ceramics, which can be formed to complicated shapes by plastic working, to nuclear energy fields are very promising because of their superior mechanical and thermal properties. Ultrasonic testing will be an effective method to detect internal flaws in superplastic ceramics components used in the nuclear fields, if it can be applied to neutron irradiated ones. In this work, neutron irradiation effects on ultrasonic wave propagation characteristics in 3mol% yttria containing tetragonal zirconia polycrystals (3Y-TZP), a typical superplastic ceramic, were studied. It was experimentally shown that wave velocity was decreased up to about 1% by neutron irradiation to 5.0×(10)^<20> n/(cm)^2(>1MeV) and also shown that attenuation ratio of the wave was decreased up to about 50%. Analytical results showed that porosity change caused by the irradiation would be a crucial factor for the velocity change as well as induced point defects and suggested that other factors probably affected the attenuation ratio.
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