Abstract
Superplastic ceramics having high ductility at elevated temperatures can be formed to complicated shapes by plastic working. Applications of them to nuclear energy fields are very promising because of their superior mechanical and thermal properties. However, there are few studies about irradiation effect on superplastic characteristics. In this work, neutron irradiation effects on superplasticity of 3mol% yttria containing tetragonal zirconia polycrystals (3Y-TZP), a typical superplastic ceramic, were studied. Fast neutrons (>1MeV) were irradiated on the 3Y-TZP specimens to 2.5×(10)^<20> (Low irradiation) and 5.0×(10)^<20> n/(cm)^2 (High irradiation) by JMTR at JAERI. It was experimentally shown that Vickers hardness was increased by the both irradiation fluences. The m-value of superplastic deformation was possibly changed by the Low irradiation. Irradiation. Irradiation induced atomic displacement damage on cations (Zr^<4+>, Y^<3+>) in the 3Y-TZP specimens would affect the superplasticity.
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