Transformation of Co-Ni-Al single crystals in tension

R. F. Hamilton, H. Sehitoglu, C. Efstathiou, H. J. Maier, Y. Chumlyakov, X. Y. Zhang

Research output: Contribution to journalArticlepeer-review


We present for the first time pseudoelasticity and shape memory results on Co-Ni-Al single crystals in tension. The experimental transformation strains approached 6% in tension in the [1 1 5] orientation. Despite the considerable volume change (0.0447), the transformation exhibits remarkable pseudoelasticity and shape memory recoverability in tension. A theoretical treatment is presented to explain the tension compression asymmetry in the stress-strain response, the change in transformation hysteresis with stress, and the role of secondary phase on the transformation temperatures.

Original languageEnglish (US)
Pages (from-to)131-136
Number of pages6
JournalScripta Materialia
Issue number1
StatePublished - Jul 2005


  • Critical stress
  • Ferromagnetic shape memory alloy
  • Hysteresis
  • Phase transformation
  • Pseudoelasticity
  • Shape memory
  • Single crystals
  • Volumetric strain

ASJC Scopus subject areas

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


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