On the volume change in Co-Ni-Al during pseudoelasticity

S. Dilibal, H. Sehitoglu, R. F. Hamilton, H. J. Maier, Y. Chumlyakov

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29 Scopus citations


CoNiAl alloys are a new class of shape memory alloys, which exhibit pseudoelastic strains as high 6% over a broad range of temperatures. Based on the crystallographic lattice constants, a substantial volume change upon transformation is expected at the mesoscopic level, yet it has not been measured previously. Transformation strains are established in three mutually orthogonal directions in the [001]-oriented CoNiAl single crystals under compression. Experiments reveal that the transformation volume change is approximately 2% based on determination of strains on transformed and untransformed locations. Despite the high volumetric strain, the pseudoelastic stress-strain response represents full recoverability with small stress hysteresis. Additional factors that influence pseudoelasticity behavior are discussed particularly the Md-Af interval and the flow resistance, which are both higher for CoNiAl compared to other shape memory alloys.

Original languageEnglish (US)
Pages (from-to)2875-2881
Number of pages7
JournalMaterials Science and Engineering: A
Issue number6
StatePublished - Mar 15 2011

All Science Journal Classification (ASJC) codes

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


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