Effect of W Alloying and NbC Dispersion on High Temperature Strength at 1773K and Room Temperature Fracture Toughness in Nb_5Si_3/Nb In-situ Composites

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The effects of W alloying and NbC dispersion on high temperature strength at 1773 K and room temperature fracture toughness are investigated using Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB> and Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB>/NbC <I>in-situ</I> composites with the hypoeutectic composition, where Nb<SUB>ss</SUB> denotes Nb solid solution. With increasing W content, 0.2% offset yield stress for both composites increases at 1773 K. The increase in the yield strength is attributable to the solid solution strengthening in Nb<SUB>ss</SUB> by adding W, low diffusivity of W in Nb<SUB>ss</SUB> and microstructural change caused by W addition. With increasing W content, fracture toughness decreases in the Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB>, but no marked change is observed in the Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB>/NbC. A crack propagates straightly in Nb–16Si–5Mo–15W, while crack deflection and branching take place in the Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB>/NbC. Fractography reveals that Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB> fractures completely in a transgranular mode, while Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB>/NbC fractured in a mixed mode of transgranular fracture and interface decohesion between NbC and Nb<SUB>ss</SUB> or Nb<SUB>5</SUB>Si<SUB>3</SUB> and Nb<SUB>ss</SUB>. It is suggested that the presence of NbC dispersoids in Nb<SUB>ss</SUB>/Nb<SUB>5</SUB>Si<SUB>3</SUB> is effective to increase high temperature strength without a significant decrease of fracture toughness.

収録刊行物

  • Materials transactions

    Materials transactions 43(6), 1415-1418, 2002-06-01

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10012324618
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    SHO
  • ISSN
    13459678
  • NDL 記事登録ID
    6200876
  • 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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