Distinction between Thermal and Stress-Induced Martensitic Transformations and Inhomogeneity in Internal Stress

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A concept of inhomogeneous internal stress called shape change stress (SCS) was introduced in martensitic transformations (MTs). The SCS was considered to be required because martensite plates formed on cooling must deform the surrounding untransformed parent. The concept enabled successful elucidation of the reason for the progress of thermally induced MTs (TIMTs) with changing temperature and for that of stress-induced MTs (SIMTs) under constant stress on the basis of the Gibbs phase rule. Decreasing SCS with decreasing specimen size (mass) explained the downward shifts of experimental equilibrium temperatures <I>T<SUB>o</SUB></I><SUP>∗</SUP>=(<I>M<SUB>s</SUB></I>+<I>A<SUB>f</SUB></I>)⁄2 with decreasing specimen mass <I>m</I> so far observed in the TIMTs of some shape memory alloys. Furthermore, the concept that no SCS is generated either in SIMTs or at the ultimate end of <I>m</I>=0 in TIMTs rationalized the following observation on a monocrystalline Cu–13.4Al–4.2Ni (mass%) alloy. That is, the variations of <I>M<SUB>s</SUB></I> and <I>M<SUB>f</SUB></I> with <I>m</I> converged at the extrapolation to <I>m</I>=0, and those of <I>A<SUB>s</SUB></I> and <I>A<SUB>f</SUB></I> also did; <I>M<SUB>s</SUB></I><SUP>#</SUP>=<I>M<SUB>f</SUB></I><SUP>#</SUP> and <I>A<SUB>s</SUB></I><SUP>#</SUP>=<I>A<SUB>f</SUB></I><SUP>#</SUP> (the superscript # indicates the transformation temperatures at the ultimate end of <I>m</I>=0). The former coincided with <I>T<SUP>L</SUP></I>(0) where the dependence of transformation stress σ<I><SUP>L</SUP></I> on temperature was extrapolated to stress zero, and the latter coincided with <I>T<SUP>U</SUP></I>(0) where a similar extrapolation in the case of reverse transformation stress σ<I><SUP>U</SUP></I> was performed.

収録刊行物

  • Materials transactions

    Materials transactions 43(9), 2249-2255, 2002-09-01

    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)
    10012326120
  • 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
    6313194
  • 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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