Continuous transition of deformation modes in Fe-30Mn-5Si-1Al alloy

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Deformation modes at various stages of plastic deformation have been investigated at the same location in an Fe-30Mn-5Si-1Al (mass%) alloy specimen, which exhibits a good shape memory effect associated with the FCC(γ) → HCP(ε) martensitic transformation and a relatively high ductility caused by deformation twinning. The surface relief caused by the γ → ε martensitic transformation, deformation twinning and slip band formation has been analyzed by measuring the surface tilt angles corresponding to each deformation mode by atomic force microscopy. Although the ε-martensitic transformation is the dominant deformation mode at an early deformation stage, a part of the ε- martensite plates changes to deformation twins with increasing tensile strain. Slip deformation also occurs inside the same region under excessive strain. A continuous transition of these deformation modes occurs in other grains as well in the same order: ε martensite → deformation twins → slip bands.

Original languageEnglish
Pages (from-to)1194-1199
Number of pages6
JournalMaterials Transactions
Volume51
Issue number7
DOIs
Publication statusPublished - 2010 Jul 1
Externally publishedYes

Keywords

  • Atomic force microscope
  • Shape memory
  • Slip deformation
  • Stress induced martensitic transfonnation
  • Twinning deformation
  • Twinning induced plasticity

ASJC Scopus subject areas

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

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