Effects of ageing on microstructure and superelastic behavior of [110]-oriented Ni45.3Ti29.7Hf20Pd5 single crystals

E. E. Timofeeva, E. Y. Panchenko, Y. I. Chumlyakov, A. I. Tagiltsev, N. G. Vetoshkina, H. Karaca, A. A. Neiman

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

The effects of ageing at 773 K for 3 h on microstructure and superelastic behavior in B2-B19' thermoelastic martensitic transformations of Ni45.3Ti29.7Hf20Pd5 (аt%) single crystals were investigated in this study. Ageing introduced nanoscale H and H′ phase precipitates, which resulted in a decrease of B2-B19' transformation temperatures, a dispersion hardening of the B2 phase and a twofold increase in the superelasticity range (up to ΔТSE=200 K) as compared with quenched crystals. In aged single crystals, reversible thermoelastic transformations with an extremely high critical stress level (σcr=1500 MPa) and reversible strain up to 1.8% were obtained at elevated temperatures (450 K).

Original languageEnglish
Pages (from-to)498-503
Number of pages6
JournalMaterials Science and Engineering: A
Volume674
DOIs
StatePublished - Sep 30 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V.

Keywords

  • Ageing
  • Hardening
  • Martensitic transformations
  • Shape memory
  • Superelasticity

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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