Phase Equilibria and Microstructure on γ' Phase in Co-Ni-Al-W System

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Phase equilibria between the γ and γ′ phases at 900°C in the Co-(10–70)Ni-Al-W system were determined by electron probe microanalysis (EPMA) and X-ray diffractometry (XRD). It was found that the γ′ phase with L1<SUB>2</SUB> structure continuously exists from the Co side to the Ni side in Co-Ni-Al-W system and that it widens to the low W region with increasing Ni content. The partition of Al into the γ′ phase increased with Ni content, while the W changed from a γ′ former to a γ former by increase of Ni content. Differential scanning calorimetry (DSC) measurements also revealed that the γ′ solvus temperature increases with Ni content, while the solidus temperature is hardly affected by such content. The lattice parameter of the γ and γ′ phases and the mismatch decreased with increasing Ni content, which caused the morphologic change of the γ′ precipitates from cubes to spheres.

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  • Materials transactions  

    Materials transactions 49(6), 1474-1479, 2008-06-01 

    日本金属学会

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各種コード

  • NII論文ID(NAID)
    10021147933
  • 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
    9519626
  • 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  NDL  IR  J-STAGE 
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