Al-1.3%Li-5.5%Cu-0.13%Zr系合金におけるT_1相の粒内析出に及ぼす微量添加元素および焼入れ条件の影響 Effects of additional elements and quenching conditions on the T_1 phase precipitation in Al-1.3%Li-5.5%Cu-0.13%Zr alloys

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The age-hardening behavior and precipitation microstructures of Al–Li–Cu–Zr alloys containing various additional elements (Ag, Ge, Zn, Si, Mg and Mg+Ag) were investigated using hardness measurement and transmission electron microscopy. The experimental results indicate that the addition of Mg has a pronounced effect to produce a high density of T<sub>1</sub> (Al<sub>2</sub>CuLi) phase at aging temperatures above ~400 K, resulting in the increased hardness of the alloys. In contrast, the additions of Ag, Ge, Zn and Si to the quaternary alloy exerts no marked influence on the precipitation kinetics. Difference in quenching condition, W.Q. (water-quench), D.Q. (direct-quench) or S.Q. (step-quench), strongly affects the precipitation microstructures and hardness of the alloys. This is well explained by taking into account the effects of both the quenched-in excess vacancies and Mg atoms. The proposed mechanism is that the excess vacancies aggregate together with Mg and Cu atoms to form Mg/Cu/Vacancy complexes which play an important role in the enhanced nucleation of the T<sub>1</sub> phase (Mg/Cu/Vacancy complex mechanism).

収録刊行物

  • 軽金属

    軽金属 46(3), 119-125, 1996-03-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10003793533
  • NII書誌ID(NCID)
    AN00069773
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    04515994
  • NDL 記事登録ID
    3936714
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-284
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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