The Effect of Ta Content on Phase Constitution and Aging Behavior of Ti-Ta Binary Alloys

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Using Ti–Ta alloy to which Ta was added systematically, <I>i.e.</I> Ti–5 mass%Ta, 10 mass%Ta, 20 mass%Ta, 30 mass%Ta, 40 mass%Ta and 50 mass%Ta alloys, the effect of Ta concentration on phase constitution in the solution treated and quenched state and aging behavior is studied by electrical resistivity and Vickers hardness measurements and X-ray diffactometry. All alloys were solution treated at 1173 K for 3.6 ks and then quenched into ice water (STQ). STQed specimens were isochronally heat treated from 323 to 1173 K . STQed specimens of Ti–50 mass%Ta alloy were isothermally aging at five different temperatures, 573 K, 623 K, 673 K, 723 K and 773 K. In the solution treated and quenched state, only reflections of hexagonal martensite, α<SUP>′</SUP> were obserevd by XRD in Ti–5Ta to 30Ta alloys, whereas only orthorhombic martensite, α<SUP>′′</SUP>, was identified by XRD in Ti–40Ta and 50Ta alloys. α<SUP>′′</SUP> in Ti–50Ta alloy is reversely transformed into β upon isochronal heat treatment: the starting temperature is situated at a temperature between 623 K and 673 K . Isothermal aging of this alloy shows that α<SUP>′′</SUP> directly decomposes to α and β phases without reverse transformation of α<SUP>′′</SUP> at 573 K and 623 K aging. On isothermal aging above 673 K, α<SUP>′′</SUP> reversely transforms into β and then isothermal ω phase precipitates in the reversed β.

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  • Materials transactions

    Materials transactions 43(12), 2984-2990, 2002-12-01

    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)
    10012328763
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    6394987
  • 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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