A new type of FCT martensite phase in single-crystalline Fe3Pt Invar alloy

Masataka Yamamoto, Sayaka Sekida, Takashi Fukuda, Tomoyuki Kakeshita, Kohki Takahashi, Keiichi Koyama, Hiroyuki Nojiri

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Martensitic transformation in a highly ordered Fe3Pt has been investigated by magnetization and X-ray diffraction measurements. We confirmed that a new type of face-centered tetragonal (FCT) martensite phase appears below 60 K in Fe3Pt with a degree of order S = 0.88. The tetragonality c/a gradually increases with decreasing temperature, and is approximately 1.005 at 10 K. This is in contrast to the tetragonality c/a < 1 generally observed in the FCT martensite with a degree of order less than 0.8. The spontaneous magnetization increases in association with the transformation.

Original languageEnglish
Pages (from-to)8530-8533
Number of pages4
JournalJournal of Alloys and Compounds
Issue number34
Publication statusPublished - 2011 Aug 25


  • Invar alloys
  • Magnetic measurements
  • Phase transitions
  • TEM
  • Transmission electron microscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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