Shape memory and martensite deformation response of Ni2MnGa

J. D. Callaway, R. F. Hamilton, H. Sehitoglu, N. Miller, H. J. Maier, Y. Chumlyakov

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8 Scopus citations

Abstract

The purpose of this paper is twofold: to establish the magnitude of detwinning stress levels of non-modulated martensite in Ni53Mn 25Ga22 as a function of heat treatments utilizing single crystals, and to study the shape memory strains from constant-load temperature cycling experiments for aged and unaged conditions. The maximum transformation strains of 5.2% are consistent with the theoretical predictions based on energy minimization theory. The results exhibit a remarkable narrowing of the thermal hysteresis (as low as 2 °C) with increasing applied stress and a considerable two-way shape memory effect. Using microscopy, it is shown that aging produces a finer martensitic plate structure with an accompanying increase in detwinning stress compared to the unaged case.

Original languageEnglish (US)
Article numberS11
Pages (from-to)S108-S114
JournalSmart Materials and Structures
Volume16
Issue number1
DOIs
StatePublished - Jan 1 2007

All Science Journal Classification (ASJC) codes

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering

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