Critical Assessments of Tensile Ductility in Superplastic TZP and TiO_2-doped TZP

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The effect of TiO<SUB>2</SUB> doping on the superplastic flow in tetragonal zirconia polycrystal (TZP) stabilized by Y<SUB>2</SUB>O<SUB>3</SUB> was examined with a special interest in tensile ductility at strain rates between 1.3×10<SUP>−4</SUP> and 1.3×10<SUP>−2</SUP> s<SUP>−1</SUP>. TZP-5 mass%TiO<SUB>2</SUB> exhibits improved tensile ductility in comparison with TZP at high strain rates. Flow stress is markedly reduced by TiO<SUB>2</SUB> addition into TZP at all strain rates examined in this study in spite of the fact that the grain size is larger in TZP-5 mass%TiO<SUB>2</SUB> than in TZP. Assuming the grain size at the time of failure, <I>d</I><SUB>f</SUB>, as a parameter to describe a limit of an accommodation process for superplastic flow, the elongation to failure is estimated from the grain growth behavior during plastic flow. The observed strain rate dependence of the elongation to failure can reasonably be described by the estimation. The present analysis reveals that there is an optimum strain rate at a constant temperature for superplastic flow as well as an optimum temperature at a certain strain rate in each material. It is clarified that the optimum strain rate or temperature for superplastic flow is dependent mainly on the activation energies for superplastic flow and grain growth, and additionally on the initial grain size.

収録刊行物

  • Materials transactions, JIM

    Materials transactions, JIM 39(11), 1108-1114, 1998-11

    社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10003804570
  • NII書誌ID(NCID)
    AA10699969
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    09161821
  • NDL 記事登録ID
    4606284
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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