title: Local microstructure evolution at shear bands in metallic glasses with nanoscale phase separation.
abstract: At room temperature, plastic flow of metallic glasses (MGs) is sharply localized in shear bands, which are a key feature of the plastic deformation in MGs. Despite their clear importance and decades of study, the conditions for formation of shear bands, their structural evolution and multiplication mechanism are still under debate. In this work, we investigate the local conditions at shear bands in new phase-separated bulk MGs containing glassy nanospheres and exhibiting exceptional plasticity under compression. It is found that the glassy nanospheres within the shear band dissolve through mechanical mixing driven by the sharp strain localization there, while those nearby in the matrix coarsen by Ostwald ripening due to the increased atomic mobility. The experimental evidence demonstrates that there exists an affected zone around the shear band. This zone may arise from low-strain plastic deformation in the matrix between the bands. These results suggest that measured property changes originate not only from the shear bands themselves, but also from the affected zones in the adjacent matrix. This work sheds light on direct visualization of deformation-related effects, in particular increased atomic mobility, in the region around shear bands.
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.|IFW Dresden, Institute for Complex Materials, PO Box 270116, Dresden 01171, Germany.
authors.forename: Jie
authors.initials: J
authors.lastname: He
authors.affiliation: IFW Dresden, Institute for Complex Materials, PO Box 270116, Dresden 01171, Germany.|TU Dresden, Institute of Materials Science, Dresden 01062, Germany.
authors.forename: Ivan
authors.initials: I
authors.lastname: Kaban
authors.affiliation: IFW Dresden, Institute for Complex Materials, PO Box 270116, Dresden 01171, Germany.
authors.forename: Norbert
authors.initials: N
authors.lastname: Mattern
authors.affiliation: IFW Dresden, Institute for Complex Materials, PO Box 270116, Dresden 01171, Germany.
authors.forename: Kaikai
authors.initials: K
authors.lastname: Song
authors.affiliation: IFW Dresden, Institute for Complex Materials, PO Box 270116, Dresden 01171, Germany.
authors.forename: Baoan
authors.initials: B
authors.lastname: Sun
authors.affiliation: Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China.
authors.forename: Jiuzhou
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Department of Metallurgical Engineering, Center for Noncrystalline Materials, Yonsei University, Seoul 120-749, Korea.
authors.forename: Do Hyang
authors.initials: do H
authors.lastname: Kim
authors.affiliation: Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraβe 12, A-8700 Leoben, Austria.|Department Materials Physics, Montanuniversität Leoben, Jahnstraβe 12, A-8700 Leoben, Austria.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Eckert
authors.affiliation: Department of Materials Science &Metallurgy, University of Cambridge, Cambridge CB3 0FS, UK.|WPI Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan.
authors.forename: A Lindsay
authors.initials: AL
authors.lastname: Greer