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Quantitative density measurements from electron scattering show that shearbands in deformed Al_{88}Y_{7}Fe_{5} metallic glass exhibit alternating highand low density regions, ranging from -9 % to +6 % relative to the un-deformedmatrix. Small deections of the shear band from the main propagation directioncoincide with switches in density from higher to lower than the matrix and viceversa, indicating that faster and slower motion (stick-slip) occurs during thepropagation. Nano-beam diffraction analyses provides clear evidence that thedensity changes are accompanied by structural changes suggesting that shearalters the packing of tightly-bound short- or medium-range atomic clusters.This bears a striking resemblance to the packing behavior in granular shearbands formed upon deformation of granular media.

Quantitative measurement of density in a shear band of metallic glass monitored along its propagation direction