Orientation dependent compression behavior of Co35Ni35Al30 single crystals

Peizhen Li, Haluk E. Karaca, Yury I. Chumlyakov

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The shape memory effect (SME) and superelasticity (SE) behavior of homogenized Co35Ni35Al30 single crystals were systematically characterized along the [100], [110] and [111] orientations under compression. The shape memory behavior of CoNiAl was found to be highly orientation and stress/temperature dependent. Maximum compressive recoverable strains were 3.98% in [110], 3% in [100] and 0.30% in [111] orientations, respectively. The Co35Ni35Al30 demonstrated a very high superelastic temperature window of more than 350 °C along the [100] and [110] orientations. Moreover, two-way shape memory effect with very low thermal hysteresis of about 6 °C was observed along the [110] orientation. The large decrease of recoverable strain and hysteresis with stress (or temperature) was mainly attributed to the difference of elastic moduli of transforming phases.

Original languageEnglish
Pages (from-to)326-334
Number of pages9
JournalJournal of Alloys and Compounds
Volume718
DOIs
StatePublished - 2017

Bibliographical note

Funding Information:
This work was supportedsupported in part by the KSEF-148-502-15-355 and NSF CMMI-1538665 programs.

Publisher Copyright:
© 2017 Elsevier B.V.

Keywords

  • CoNiAl
  • Shape memory alloys
  • Single crystal
  • Superelasticity
  • Two-way shape memory effect

ASJC Scopus subject areas

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

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