ジルコニアセラミックスの超塑性変形後における機械的性質の評価

概要

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Mechanical properties of tetragonal zirconia polycrystals are examined in terms of deformed strain and grain size after superplastic compression at 1 500℃, and the mechanisms of microstructural contribution are elucidated. The specimens for mechanical tests are obtained from block specimens deformed at various strain rates and stopped in different strain states. The bending strength and Young's modulus increase with strain but show no dependence on the grain size. The reduction of flaw size due to compressive strain is expected to be a primary mechanism of enhancement. The Vickers hardness represents the softening behavior at the initial deformation and cannot be evaluated from either the strain or the grain size only. On the other hand, the change in the fracture toughness is evaluated by the grain growth behavior. The fracture toughness increases with grain size due to the increased transformation-zone size near the Vickers indentation.
一般社団法人日本機械学会の論文
1995-05-25