507 超塑性セラミック 3Y-20A の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

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Specimens of 3Y-20A (zirconia-alumina composite) were deformed superplastically to pre-determined tensile strains at various temperatures with different initial strain rates. 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 greatly improved when the cavity volume fraction was 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 0.6μm have a negative effect on the fracture toughness.
一般社団法人日本機械学会の論文
2002-08-23