Coherency of ordered γ′ precipitates and thermoelastic martensitic transformation in FeNiCoAlTaB alloys

Yonghong Geng, Doyup Lee, Xiao Xu, Makoto Nagasako, Mingjiang Jin, Xuejun Jin, Toshihiro Omori, Ryosuke Kainuma

Research output: Contribution to journalLetterpeer-review

27 Citations (Scopus)

Abstract

The martensitic transformation characteristics and coherency of ordered γ′ precipitates are investigated by electrical resistivity tests and HAADF-STEM observation in the aged FeNiCoAlTaB alloys. The results reveal that the precipitate grows up in the Ostwald ripening mode at the initial aging stage. As aging time increasing, the coarsening behavior of precipitates deviates from the Ostwald ripening and the martensitic transformation changes from the thermoelastic type to the non-thermoelastic one. The thermoelastic to non-thermoelastic transition with increasing precipitates size results from coherency loss between precipitates and matrix during martensitic transformation.

Original languageEnglish
Pages (from-to)287-292
Number of pages6
JournalJournal of Alloys and Compounds
Volume628
DOIs
Publication statusPublished - 2015 Apr 15

Keywords

  • Coherency
  • Phase transition
  • Precipitation
  • Shape memory
  • Thermoelastic martensitic transformation

ASJC Scopus subject areas

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

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