title: Localized crystallization in shear bands of a metallic glass.
abstract: Stress-induced viscous flow is the characteristic of atomic movements during plastic deformation of metallic glasses in the absence of substantial temperature increase, which suggests that stress state plays an important role in mechanically induced crystallization in a metallic glass. However, it is poorly understood. Here, we report on the stress-induced localized crystallization in individual shear bands of Zr60Al15Ni25 metallic glass subjected to cold rolling. We find that crystallization in individual shear bands preferentially occurs in the regions neighboring the amorphous matrix, where the materials are subjected to compressive stresses demonstrated by our finite element simulations. Our results provide direct evidence that the mechanically induced crystallization kinetics is closely related with the stress state. The crystallization kinetics under compressive and tensile stresses are interpreted within the frameworks of potential energy landscape and classical nucleation theory, which reduces the role of stress state in mechanically induced crystallization in a metallic glass.
authors.affiliation: School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, P. R. China.|IFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, D-01069 Dresden, Germany.
authors.forename: Zhijie
authors.initials: Z
authors.lastname: Yan
authors.affiliation: IFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, D-01069 Dresden, Germany.|School of Mechanical, Electrical &Information Engineering, Shandong University (Weihai), Weihai 264209, P.R. China.
authors.forename: Kaikai
authors.initials: K
authors.lastname: Song
authors.affiliation: School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, P. R. China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Northwestern Polytechnical University, Xi'an 710072, P.R. China.
authors.forename: Fuping
authors.initials: F
authors.lastname: Dai
authors.affiliation: School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, P. R. China.
authors.forename: Zhibing
authors.initials: Z
authors.lastname: Chu
authors.affiliation: Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria.|Department of Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Eckert