Two-way shape memory effect induced by bending deformation in ductile Cu-Al-Mn alloys

Toshihiro Omori, Jijie Wang, Yuji Sutou, Ryosuke Kainuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Martensitic transformation temperatures and the two-way shape memory effect (TWME) in ductile Cu-Al-Mn alloys deformed at room temperature were investigated using differential scanning calorimetry (DSC) and the bending test. The Msand Af temperatures were found to increase slightly with increasing degree of pre-deformation, while the Mf and As temperatures decreased. The TWME is strongly influenced by the Ms temperature and the grain size of the specimens, i.e., the highest degree of TWME is always obtained in the specimens with Ms ≈ -100°C and the TWME increases with increasing ratio of grain size to specimen width, where the maximum value of TWME = 3.2% was obtained in the present study. In situ observation of the surface relief at several temperatures on the deformed specimens was also performed and it was found that some restricted martensite variants grow and shrink with temperature change without the typical self-accommodation microstructure in the specimens with large TWME.

Original languageEnglish
Pages (from-to)1676-1683
Number of pages8
JournalMaterials Transactions
Volume43
Issue number7
DOIs
Publication statusPublished - 2002 Jul
Externally publishedYes

Keywords

  • Copper-aluminum-manganese
  • Grain size
  • Martensitic transformation
  • Two-way shape memory effect (TWME)

ASJC Scopus subject areas

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

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