Electron Concentration and Structural Transformation of Ni_2MnGa-Based Shape Memory Alloys

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In shape memory Ni<SUB>2</SUB>MnGa based alloys, the structural transition temperature (<I>T<SUB>t</SUB></I>) increases with increasing valence electron concentration per atom (<I>e</I>⁄<I>a</I>). That is, when Ni or Mn atoms in Ni<SUB>2</SUB>MnGa are replaced with a fourth element (X atom), the <I>T<SUB>t</SUB></I> increases with increasing atomic number of the X atom. To examine the experimental results, the electronic structures of these alloys were calculated for the cubic and monoclinic structures. The difference <I>ΔE</I> of total energies between the two structures was also calculated as a function of <I>e</I>⁄<I>a</I>. It was found that the features of <I>T<SUB>t</SUB></I> (<I>e</I>⁄<I>a</I>) are similar to those of <I>ΔE</I> (<I>e</I>⁄<I>a</I>). Their features are different in the lower and higher ranges than the boundary <I>e</I>⁄<I>a</I>=7.625. The two features are characterized by two cases: a case that X atoms occupies Ni sites and the other case that X atoms occupy Mn sites. The characteristics mainly come from the difference of the density of states of X atoms at Ni and Mn sites.

収録刊行物

  • Materials transactions

    Materials transactions 43(5), 846-851, 2002-05-01

    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)
    10012322816
  • 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
    6179460
  • 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  CJP引用  NDL  J-STAGE 
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