Compressive response of nickel-rich NiTiHf high-temperature shape memory single crystals along the [1 1 1] orientation

H. E. Karaca, S. M. Saghaian, B. Basaran, G. S. Bigelow, R. D. Noebe, Y. I. Chumlyakov

Research output: Contribution to journalArticlepeer-review

59 Scopus citations

Abstract

The shape memory properties of Ni-rich NiTiHf single crystals along the [1 1 1] orientation were investigated by thermal cycling under constant stress and stress cycling at constant temperature in compression. The single crystals demonstrate stable shape memory behavior under ultrahigh stress levels (1000 MPa) with about 3% transformation strain, a maximum work output of 30 J cm -3 and nearly perfect pseudoelasticity at high temperatures (180-200 °C).

Original languageEnglish
Pages (from-to)577-580
Number of pages4
JournalScripta Materialia
Volume65
Issue number7
DOIs
StatePublished - Oct 2011

Bibliographical note

Funding Information:
This work was supported in part by the KY NASA EPSCoR ( N08R02B ) and NASA Fundamental Aeronautics Program under the Supersonics Project , Dale Hopkins, API.

Keywords

  • Martensitic phase transformation
  • NiTiHf
  • Shape memory alloys
  • Single crystals
  • Transformation strain

ASJC Scopus subject areas

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

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