Abstract
Abstract The plastic deformation of ribbons of Ni75 Si8B17 metallic glass, bent into a hairpin configuration between parallel platens, has been investigated with a combination of mechanical tests and in situ scanning electron microscope (SEM) observations Three stages could be distinguished as the bending deformation proceeded : (1) a homogeneous stage, in which permanent plastic deformation occurred without the formation of shear bands, (2) a second regime in which shear deformation proceeded by the formation and propagation of shear bands and (3) a final stage in which the deformation was concentrated in a few shear bands with crack formation in the upper parts of these bands. The measured slip distribution along a shear band was analysed by modelling the shear band as a distributed pile-up of Volterra edge dislocations. Good agreement was found between the theoretical and experimental curves when the friction stress was treated as an adjustable parameter. The friction stress derived in this way was fou...
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