Shape memory behavior of [111]-oriented NiTi single crystals after stress-assisted aging

Irfan Kaya, Hirobumi Tobe, Haluk Ersin Karaca, Emre Acar, Yuriy Chumlyakov

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

The shape memory behavior of [111]-oriented Ni51Ti49 (at.%) single crystals was investigated after stressassisted aging at 500 °C for 1.5 h under a compressive stress of -150 MPa. It was found that a single family of Ni4Ti3 precipitates with two crystallographically equivalent variants was formed after aging under compressive stress. Stressassisted aging resulted in tensile two-way shape memory effect strain of 1.56% under -5 MPa. Thermal cycling under -600 MPa resulted in a transformation strain of -2.15%, while the subsequent thermal cycling under -5 MPa resulted in a tensile two-way shape memory effect strain of 2.2%.

Original languageEnglish
Pages (from-to)282-286
Number of pages5
JournalActa Metallurgica Sinica (English Letters)
Volume29
Issue number3
DOIs
StatePublished - Mar 2016

Bibliographical note

Funding Information:
This work was supported in part by the NASA Fundamental Aeronautics Program, Supersonics Project and the NASA EPSCOR program (Grant No. NNX11AQ31A), and RFBR Project (Grant No. 10-03-0154-a). .

Publisher Copyright:
© 2016 The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg.

Keywords

  • Aging treatment
  • Phase transformations
  • Precipitation
  • Shape memory alloy (SMA)
  • Two-way shape memory effect

ASJC Scopus subject areas

  • Metals and Alloys
  • Industrial and Manufacturing Engineering

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