Viscous flow in sliding shear band formed during tensile deformation of hypoeutectic Zr-based metallic glass

International audienceThe Zr(70)Ni(16)Cu(6)Al(8) bulk metallic glass (BMG) was tested in tension mode using high-speed imaging in order to monitor the viscous flow inside a sliding shear band. Assuming the shear band thickness to be 15 nm, we estimated the shear viscosity to be similar to 3.8 x 10(3) Pa s. The apparent temperature in the shear band was estimated to reach approximately 852 K on the basis of the relationship between the viscosity and the strain rate in the supercooled liquid region and was found to be considerably lower than the melting temperature (1293 K). (C) 2011 Published by Elsevier Ltd