Atomic force microscopic observation of microstructural changes in Fe-Mn-Si-Al shape memory alloy

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

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5 Citations (Scopus)

Abstract

The surface relief caused by stress-induced fcc/hcp martensitic transformation in an Fe-30Mn-5Si-1Al shape memory alloy, which exhibited a good shape memory effect and an improved ductility due to a small addition of aluminum to a conventional Fe-30Mn-6Si shape memory alloy, was quantitatively analyzed by atomic force microscopy. The orientation of an austenite grain was determined with surface traces of four {111} f planes, which made it possible to determine the surface tilt angles for all 12 variants of hep martensite and deformation twins. On the basis of these values, the stress-induced martensite and deformation twin, coexisting in a grain, were identified by investigating the surface tilt angles. The surface relief caused by the stress-induced martensite recovered after heating above the reverse transformation temperature, but that due to the deformation twin remained unaltered.

Original languageEnglish
Pages (from-to)672-677
Number of pages6
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume71
Issue number9
DOIs
Publication statusPublished - 2007 Sep 1

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Keywords

  • Atomic force microscopy
  • Deformation twinning
  • Ductility
  • Iron-manganese-silicon- aluminum
  • Shape memory alloy
  • Stress-induced martensitic transformation
  • Twinning induced plasticity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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