ジルコニア-アルミナ複合セラミックの超塑性引張変形後の破壊靱性に及ぼす粒界キャビティーの影響

概要

論文の詳細を見る
Specimens of a zirconia-alumina composite were deformed superplastically to pre-determined tensile strains at various temperatures with different initial strain rates. Microstructures evolved during the superplastic deformations and variations in mechanical properties at room temperature were investigated on the specimens. Cavities were formed in the specimens during the deformations. The amount of the cavities in the specimens increased with an increase in the strain. Fracture toughness of the specimens changed complicatedly with the increase in the amount of cavities. It was found that the fracture toughness was fairly improved when the cavity volume fraction becomes around 1%. The fracture toughness was also affected by the cavity size. We concluded that the cavities with diameters of less than about 0.3μm can improve the fracture toughness, whereas the cavities with sizes larger than about 0.3μm have a negative effect on the fracture toughness.
一般社団法人日本機械学会の論文
2005-09-25