超塑性セラミック3Y-20Aの引張変形に起因する微細組織および機械的性質の変化

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Superplastic tension tests of SY 20A have been carried out at various temperatures with differenttial strain rates. The amount of cavities, formed during superplastic deformation, has increased linearlyas tensile strain has increased. Due to the cavity forming, hardness and bending strength of deformedspecimens have degraded. but by contraries. fracture toughness has been improved. The hardness andbending strength have been smaller than those estimated from the rule of mixtures. And then, de'formed specimens, having volume fractions of cavities being about one percent, have shown muchlarger fracture toughness than undeformed ones.Key Words Superplastic Deformation, 3Y 20A, Cavitation,Vickers Hardness, Fracture Toughness, Bending Strength
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