AuCu合金の相転移と熱膨張挙動 Phase Transitions and Thermal Expansion Behavior in AuCu Alloy

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  Thermal expansion behavior in a stoichiometric AuCu alloy was investigated from a point of view of a phase transition. Thermal expansion measurement was carried out from room temperature to 873 K at various heating and cooling rate. The crystal structures and the phase transitions were analyzed by X-ray diffractmetry and differential scanning calorimetry, respectively. The structure of the casted alloy was a disordered face-centered cubic and changed to a face-centered tetragonal structure or mixed structure of fcc and AuCu I after thermal expansion measurement. In the thermal expansion curves, break points were corresponded to order-disorder transition. During the heating process, three break points corresponding to three different ordering stages were observed. The activation energy for each stage was obtained using Kissinger method. It was considered that first and second stages are ascribed to the migration of excess vacancies induced by quenching, and third stage is predominated by self-diffusion.<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 72(5), 311-316, 2008-05-01 

    日本金属学会

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各種コード

  • NII論文ID(NAID)
    10021150200
  • 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
    9514197
  • 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  NDL  IR  J-STAGE 
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