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|Title: ||Variability of Poisson's Ratio and Enhanced Ductility in Amorphous Metal|
|Authors: ||Liss, K -D|
Qu, D D
|Issue Date: ||1-May-2013|
|Publisher: ||WILEY-V C H VERLAG GMBH|
|Citation: ||Liss, K. -D., Qu, D. D., Yan, K., & Reid, M. (2013). Variability of Poisson's Ratio and Enhanced Ductility in Amorphous Metal. Advanced Engineering Materials, 15(5), 347-351.|
|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. © 2013, Wiley-VCH Verlag GmbH & Co. KGaA|
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