Martensitic transformation in thin foils of an Fe-Ni-Co-Ti shape memory alloys

S. Morito, T. Moritani, T. Furuhara, T. Maki

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


The effect of specimen thickness on morphology and crystallography of α′(bct) martensite was studied in an Fe-Ni-Co-Ti shape memory alloy. The specimens with greater thickness than 0.5 mm form thin plate martensite which is characterized by a highly smooth and planar interface and has completely twinned internal structure. The martensite formed in thin foil (about 0.1 μM thick) has irregular interfaces and the internal structure is completely or partially twinned. The width of transformation twins in martensite formed in thin foil is smaller than that in bulk specimen. The martensite/austenite orientation relationship in the bulk specimen is close to the Nishiyama relationship. In contrast, the orientation relationship of thin foil martensite deviates by as much as 5° from the Nishiyama relationship.

Original languageEnglish
Pages (from-to)207-210
Number of pages4
JournalMaterials Science Forum
Publication statusPublished - 2000 Jan 1
Externally publishedYes
EventProceedings of the 1999 International Symposium and Exhibition on Shape Memory Materials (SMM'99) - Kanazawa, Jpn
Duration: 1999 May 191999 May 21

ASJC Scopus subject areas

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


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