Significant tensile ductility induced by cold rolling in Cu47.5Zr47.5Al5 bulk metallic glass

Significant tensile plasticity up to 0.7 +/- 0.1% together with work-hardening and larger fracture strength was obtained in Cu(47.5)Zr4(7.5)Al(5) bulk metallic glass (BMG) upon cold rolling with only 2.9 +/- 0.3% thickness reduction. The good deformability could be attributed to the multiple pre-existing shear bands and structural inhomogeneity induced by rolling. The distributions of shear bands upon rolling can be predicted by a simplified rolling model. The underlying mechanism for the tensile plasticity was further discussed in the frame of potential energy landscape theory (PEL). (C) 2011 Elsevier Ltd. All rights reserved.