Klaus-Dieter Liss, Dongdong Qu, Kun Yan and Mark Reid Variability of Poisson's Ratio and Enhanced Ductility in Amorphous Metal Advanced Engineering Materials 15
X-ray diffraction rings from bulk metallic glass represent the elastic strain ellipse along azimuth ψ upon uniaxial, mechanic compression. Poisson's ratio, defined by the quotient of strain in the longitudinal L and transverse T direction, varies upon the onset of plastic flow and is found to become ultimately large just before failure. The in situ experiment finds strain saturation at atomic close packing in the L direction while atoms yield laterally, creating free volume. The non-affine behavior of elastic-plastic deformation gives an explanation for the correlation between high Poisson's ratio and high ductility of metallic glass.
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