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Variability of Poisson's ratio and enhanced ductility in amorphous metal

Journal Article


Abstract


  • Ductile bulk metallic glass of composition 53.0Zr-18.7Cu-12.0Ni-16.3Al (at%) is plastically deformed under uniaxial compression and observed in situ by synchrotron high-energy X-ray diffraction. The diffraction patterns reveal the induced atomic strain is orientation dependent. At the onset of plastic deformation, the atomic strain in the compression direction saturates to a close-nearest-neighbor distance while atoms relax in the transverse direction. The ever increasing transverse atomic strain expresses in an augmentation of the apparent Poisson's ratio up to ν = 0.5, which is consistent with volume conservation. Contradicting phenomena from linear mechanics, such as the non-vanishing shear modulus at ν = 0.5 can be explained by the non-affine character of the deformation, giving rise to characteristics of a localized martensitic phase transformation. The findings explain the often-reported phenomena such as, the high Poisson's ratio values found in metallic glasses, the partially liquid character of the structure, the free volume increase and the Bauschinger effect. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Authors


  •   Liss, Klaus-Dieter
  •   Qu, Dongdong (external author)
  •   Yan, Kun (external author)
  •   Reid, Mark H.

Publication Date


  • 2013

Citation


  • Liss, K., Qu, D., Yan, K. & Reid, M. H. (2013). Variability of Poisson's ratio and enhanced ductility in amorphous metal. Advanced Engineering Materials, 15 (5), 347-351.

Scopus Eid


  • 2-s2.0-84877277210

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1235

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 347

End Page


  • 351

Volume


  • 15

Issue


  • 5

Place Of Publication


  • Germany

Abstract


  • Ductile bulk metallic glass of composition 53.0Zr-18.7Cu-12.0Ni-16.3Al (at%) is plastically deformed under uniaxial compression and observed in situ by synchrotron high-energy X-ray diffraction. The diffraction patterns reveal the induced atomic strain is orientation dependent. At the onset of plastic deformation, the atomic strain in the compression direction saturates to a close-nearest-neighbor distance while atoms relax in the transverse direction. The ever increasing transverse atomic strain expresses in an augmentation of the apparent Poisson's ratio up to ν = 0.5, which is consistent with volume conservation. Contradicting phenomena from linear mechanics, such as the non-vanishing shear modulus at ν = 0.5 can be explained by the non-affine character of the deformation, giving rise to characteristics of a localized martensitic phase transformation. The findings explain the often-reported phenomena such as, the high Poisson's ratio values found in metallic glasses, the partially liquid character of the structure, the free volume increase and the Bauschinger effect. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Authors


  •   Liss, Klaus-Dieter
  •   Qu, Dongdong (external author)
  •   Yan, Kun (external author)
  •   Reid, Mark H.

Publication Date


  • 2013

Citation


  • Liss, K., Qu, D., Yan, K. & Reid, M. H. (2013). Variability of Poisson's ratio and enhanced ductility in amorphous metal. Advanced Engineering Materials, 15 (5), 347-351.

Scopus Eid


  • 2-s2.0-84877277210

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1235

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 347

End Page


  • 351

Volume


  • 15

Issue


  • 5

Place Of Publication


  • Germany