Al-Mg_2Si系合金における準安定相の高分解能電子顕微鏡観察 HRTEM observation of metastable phase in Al-Mg_2Si alloys

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High resolution electron microscopy (HRTEM) was performed for an aged Al–1.0 mass%Mg<sub>2</sub>Si alloy to clarify the morphology and crystal system of the precipitates that occur prior to the β' intermediate phase. At the early stage of aging, there observed a number of precipitates with irregular arrangement of bright dots in their cross-sections of the HRTEM images. With increasing aging time, the precipitates with the irregular arrangement of bright dots (the random type) decrease and the precipitates with the parallelogram network arrangement of bright dots in their cross-sections (the parallelogram type) begin to increase. The parallelograms have interior angles between 62° and 89°. The 30% of them had a fixed angle of 75° (the 75° parallelogram type). In the over aging condition, the number density of the parallelogram type precipitates decrease, and the β' intermediate phase becomes predominant. There are three types of precursory precipitates, the random, the parallelogram and the 75° parallelogram types, prior to the β' phase at all aging temperatures investigated in Al–0.6 mass%Mg<sub>2</sub>Si, Al–1.0 mass%Mg<sub>2</sub>Si and Al–1.6 mass%Mg<sub>2</sub>Si alloys. The compositional region, where the above three types of precipitates are observed, is in good agreement with the previously reported region for G.P. (2) zone in the equilibrium phase diagram of the Al–Mg<sub>2</sub>Si pseudo-binary alloy.

収録刊行物

  • 軽金属

    軽金属 47(9), 493-499, 1997-09-30

    The Japan Institute of Light Metals

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各種コード

  • NII論文ID(NAID)
    10003795912
  • 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
    4304506
  • 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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