超塑性3Y-TZPセラミックスの微細構造への中性子照射の影響(オーガナイズドセッション,超塑性と材料および造形法)

概要

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Applications of superplastic ceramics, which can be formed into complicated shapes by plastic working, to high temperature gas-cooled reactor fields are very promising because of their superior mechanical and thermal properties. Neutron irradiation effects on superplasticity in tetragonal zirconia polycrystals containing 3mol% yttria (3Y-TZP), a typical superplastic ceramic, were studied from the standpoint of their microstructure. Fast neutrons (>lMeV) were irradiated on the 3Y-TZP specimens to 2.5x10^<20> (Low irradiation) and 4.3x10^<20> n/cm^2 (High irradiation) by JMTR at JAERI. It was experimentally shown that the flow stress of superplastic deformation was decreased by increasing the neutron fluence. SEM micrographs of the specimens showed that it was difficult to explain the change only by the formation of cavities during the deformation. It was suggested that irradiation-induced defects, nuclear transmutation and radiation-induced segregation in the 3Y-TZP were responsible for it.
一般社団法人日本機械学会の論文
2004-09-23