Annealing Twinning in Boron-Doped Ni_3Al

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Dependence of frequency of annealing twinning events on annealing temperature and composition, especially boron content, in polycrystalline Ni<SUB>3</SUB>Al alloys has been investigated by means of optical and transmission electron microscopy, and also by evaluation of coherent twin boundary energy via counting the wrong atomic bonds across twin boundaries. Microstructural observation found that after homogenization at temperatures from 1000 to 1360°C both binary and boron-doped Ni<SUB>3</SUB>Al alloys without prestrain show annealing twins only on the Al-rich side with respect to stoichiometry below 1200°C. Above 1200°C annealing twinning may also take place on the Ni-rich side of stoichiometry in the binary alloy system but no twins were found in the γ+γ<SUP>′</SUP> two-phase field. In contrast to plenty of annealing twins in binary alloys, addition of boron decreases greatly the number of twins. 0.2 at% addition significantly decreases the frequency of twinning events and no twins appear above 1200°C. 0.5 at% boron almost cleans out all the twins from the microstructure. Annealing twinning is supposed to be completed by two processes including sweeping of 1⁄3⟨211⟩ superpartial dislocations on successive (111) planes and simultaneous diffusion of boron atoms into the energetically favorable octahedral interstice that are surrounded by six Ni atoms. Boron acts as a strong obstacle to the movement of the superpartial dislocations and greatly increases difficulty in annealing twinning.

収録刊行物

  • Materials transactions

    Materials transactions 43(6), 1283-1290, 2002-06-01

    公益社団法人 日本金属学会

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各種コード

  • NII論文ID(NAID)
    10012324171
  • 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
    6200441
  • 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  J-STAGE 
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