Effect of Grain Boundary Cavity on Fracture Toughness after Tensile Deformations of Superplastic Ceramic 3Y-20A

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  • 小山 真二郎
    Department of Mechanical Engineering, Fukushima National College of Technology
  • 本橋 嘉信
    The Research Center for Superplasticity, Faculty of Engineering, Ibaraki University
  • 佐東 信司
    Department of Mechanical Engineering, Fukushima National College of Technology

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Other Title
  • 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

Abstract

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.

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