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

Fingerprint

shape memory alloys
Shape memory effect
atomic force microscopy
martensite
Martensite
Martensitic transformations
martensitic transformation
austenite
ductility
Austenite
Ductility
Atomic force microscopy
Heating
heating
matrices
Temperature
temperature

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)
  • Metals and Alloys

Cite this

AFM observation of microstructural changes in Fe-Mn-Si-Al shape memory alloy. / Koyama, Motomichi; Murakami, Masato; Ogawa, Kazuyuki; Kikuchi, Takehiko; Sawaguchi, Takahiro.

In: Materials Transactions, Vol. 49, No. 4, 04.2008, p. 812-816.

Research output: Contribution to journalArticle

Koyama, Motomichi ; Murakami, Masato ; Ogawa, Kazuyuki ; Kikuchi, Takehiko ; Sawaguchi, Takahiro. / AFM observation of microstructural changes in Fe-Mn-Si-Al shape memory alloy. In: Materials Transactions. 2008 ; Vol. 49, No. 4. pp. 812-816.
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