New aspects of martensite stabilization in Ni-Mn-Ga high-temperature shape memory alloy

V. Khovaylo, R. Kainuma, K. Ishida, T. Omori, H. Miki, T. Takagi, A. Datesman

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We report on new aspects of martensite stabilization in high-temperature shape memory alloys. We show that, due to the difference in activation energies among various structural defects, an incomplete stabilization of martensite can be realized. In material aged at high temperatures, this gives rise to a variety of unusual features which are found to occur in the martensitic transformation. Specifically, it is shown that both forward and reverse martensitic transformations in a Ni-Mn-Ga high-temperature shape memory alloy can occur in two steps. The observed abnormal behaviour is evidence that, in certain circumstances, thermoelastic martensitic transformation can be induced by diffusion.

Original languageEnglish
Pages (from-to)865-882
Number of pages18
JournalPhilosophical Magazine
Volume88
Issue number6
DOIs
Publication statusPublished - 2008 Feb

Keywords

  • Ageing
  • Heusler alloys
  • Martensite stabilization
  • Martensitic transformation
  • Shape memory alloys

ASJC Scopus subject areas

  • Condensed Matter Physics

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