Mg-12.0%Gd-1.9%Y-0.7%Zr合金における時効析出物の高分解能透過型電子顕微鏡観察 HRTEM Observation of Age Hardening Precipitates in Mg-12.0%Gd-1.9%Y-0.7%Zr

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著者

    • 川畑 常眞 KAWABATA Tokimasa
    • 富山大学工学部物質生命システム工学科 Department of System Engineering of Material and Life Science, Faculty of Engineering, University of Toyama
    • 松田 健二 MATSUDA Kenji
    • 富山大学大学院理工学研究部 Graduate School of Science and Engineering for Research, University of Toyama
    • 小島 陽 KOJIMA Yo
    • 長岡技術科学大学機械系 Faculty of Engineering, in Nagaoka University of Technology, Nagaoka
    • 池野 進 IKENO Susumu
    • 富山大学大学院理工学研究部 Graduate School of Science and Engineering for Research, University of Toyama

抄録

  The precipitation sequence in Mg-12.0 mass%Gd-1.9 mass%Y-0.69 mass%Zr alloy was investigated using high resolution transmission electron microscopy (HRTEM). The globular shaped contrast, which were probably composed of Gd and Y atoms were observed in a specimen quenched after solution heat treatment. Aging treatment was performed up to 64 hours at 473 K. The monoplanar precipitates were formed on plane (1100) of magnesium matrix of the specimen early in the aging stage at 473 K for 4 hours. In addition to the mono planar precipitates, a part of β″ phase with D0<sub>19</sub> structure and β′ phase with base centered orthorhombic structure were also observed in the same specimen. It was found that these precipitates coexisted in the specimen early at the aging stage. Based on the analysis of selected area diffraction patterns, it was revealed that β″ phase preferentially formed early in the aging stage. However, the β′ phase preferentially observed comparing to β″ phase in the specimen which had maximum hardness by aging at 473 K for 64 hours. Accordingly, the nucleation and growth of β′ phase dominates comparing to β″ in the stage of peak aging. These results suggest that coexistence of β′ phase and β″ phases, especially β′ phase attributes to the maximum hardness of aged alloy.<br>

収録刊行物

  • 日本金屬學會誌 = Journal of the Japan Institute of Metals  

    日本金屬學會誌 = Journal of the Japan Institute of Metals 70(10), 828-834, 2006-10-20 

    The Japan Institute of Metals

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各種コード

  • NII論文ID(NAID)
    10018310758
  • NII書誌ID(NCID)
    AN00062446
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00214876
  • NDL 記事登録ID
    8550689
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-314
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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