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Twinning in shear and uniaxial loading in five layered martensite Ni-Mn-Ga single crystals

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Abstract

Five-layered martensite Ni-Mn-Ga single crystals are known for their exceptionally mobile twin boundaries allowing a shape change under mechanical stress and by magnetic field. The mechanically measured twinning stress has usually been studied in uniaxial mode, however the twinning and detwinning is generally accepted to be resulted by the shear component. We have studied the twinning behavior at uniaxial and shear stress. In addition we have applied the shear stress at different angles in relation to the expected twinning direction \(\left[ {10\bar 1} \right]\). The results show that the onset of twinning lays at similar stress levels in both uniaxial and shear modes.

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Authors and Affiliations

  1. School of Chemical Technology, Department of Materials Science and Engineering, Aalto University, Vuorimiehentie 2 A, 02150, Espoo, Finland

    Ilkka Aaltio, Yanling Ge & Simo-Pekka Hannula

Authors
  1. Ilkka Aaltio
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  2. Yanling Ge
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  3. Simo-Pekka Hannula
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Corresponding author

Correspondence to Ilkka Aaltio.

Additional information

Contribution to the Topical Issue “New Trends in Magnetism and Magnetic Materials”, edited by Francesca Casoli, Massimo Solzi and Paola Tiberto.

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Aaltio, I., Ge, Y. & Hannula, SP. Twinning in shear and uniaxial loading in five layered martensite Ni-Mn-Ga single crystals. Eur. Phys. J. B 86, 49 (2013). https://doi.org/10.1140/epjb/e2012-30744-3

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  • DOI: https://doi.org/10.1140/epjb/e2012-30744-3

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