Unusual reversible twinning modes and giant superelastic strains in FeNiCoAlNb single crystals

Y. I. Chumlyakov, I. V. Kireeva, O. A. Kutz, A. S. Turabi, H. E. Karaca, I. Karaman

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

The superelastic response of the Fe41Ni28Co17Al11.5Nb2.5 (at. %) single crystals oriented along the [001] direction was investigated in tension at various temperatures after aging at 973 K for 0.5 h. The aging treatment led to the formation of ordered γ' particles with particle sizes of less than 3 nm. Abnormally large reversible strain of up to 15.3% was observed at 77 K, the highest ever reported for an iron-based shape memory alloys. It has been revealed that this giant superelastic strain, significantly higher than the theoretical transformation strain, is associated with γ-α' martensitic transformation and elastic mechanical twinning of < 011 >{110} type.

Original languageEnglish
Pages (from-to)43-46
Number of pages4
JournalScripta Materialia
Volume119
DOIs
StatePublished - Jul 1 2016

Bibliographical note

Publisher Copyright:
© 2016 Published by Elsevier B.V.

Keywords

  • FeNiCoAlNb
  • Iron-based shape memory alloys
  • Superelastic Strain
  • Superelasticity
  • Twinning

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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