Role of aging time on the microstructure and shape memory properties of NiTiHfPd single crystals

E. Acar, H. E. Karaca, B. Basaran, F. Yang, M. J. Mills, R. D. Noebe, Y. I. Chumlyakov

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Shape memory properties of [111] oriented NiTiHfPd single crystals aged at 600 °C for 48 and 72 h were investigated through isobaric thermal cycling and superelasticity experiments in compression. A maximum transformation strain of 2.6% at 1000. MPa compressive stress was attained above 100 °C. It was observed that precipitate size and interparticle distances were strong functions of aging time and subsequently govern the shape memory responses of the NiTiHfPd single crystals. Moreover, it was revealed that the elastic energy storage highly depends on precipitate characteristics.

Original languageEnglish
Pages (from-to)161-165
Number of pages5
JournalMaterials Science and Engineering: A
StatePublished - Jun 20 2013

Bibliographical note

Funding Information:
This work was supported in part by the NASA Fundamental Aeronautics Program, Aeronautical Sciences Project and the NASA EPSCOR Program under Grant No NNX11AQ31A and KY EPSCoR RID Program under Grant No 3049024332 and RFBR Project with Grant no 10-03-0154-a . FY and MJM acknowledge the support of the US Department of Energy, Office of Basic Energy Sciences.


  • Aging
  • Elastic energy
  • NiTiHfPd
  • Shape memory alloy
  • Single crystals

ASJC Scopus subject areas

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


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