AFM observation of microstructural changes in Fe-Mn-Si-Al shape memory alloy

Motomichi Koyama, Masato Murakami, Kazuyuki Ogawa, Takehiko Kikuchi, Takahiro Sawaguchi

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

We analyzed the surface relief caused by stress-induced hcp martensitic transformation in Fe-30Mn-5Si-1A1 shape memory alloy by atomic force microscopy. The alloy exhibits a good shape memory effect and an improved ductility due to a small addition of Al to a conventional Fe-30Mn-6Si shape memory alloy. The orientation of an austenite matrix was determined with surface traces of four {111}f planes, which enabled us to determine the surface tilt angles for all twelve variants of hep martensites and deformation twins. On the basis of these values, stress-induced martensite and deformation twin coexisting in the same grain were identified by studying the surface tilt angles. The surface relieves caused by the stress-induced martensite recovered after heating above the reversed transformation temperature, however some relieves originating from the deformation twin remained.

Original languageEnglish
Pages (from-to)812-816
Number of pages5
JournalMaterials Transactions
Volume49
Issue number4
DOIs
Publication statusPublished - 2008 Apr 1

Keywords

  • Aluminum addition
  • Atomic force microscopy
  • Ductility
  • Iron-manganese-silicon
  • Martensite
  • Shape memory alloy
  • Twin
  • Twinning induced plasticity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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