Atomic-scale viscoplasticity mechanisms revealed in high ductility metallic glass films.

ABSTRACT: The fundamental plasticity mechanisms in thin freestanding Zr₆₅Ni₃₅ metallic glass films are investigated in order to unravel the origin of an outstanding strength/ductility balance. The deformation process is homogenous until fracture with no evidence of catastrophic shear banding. The creep/relaxation behaviour of the films was characterized by on-chip tensile testing, revealing an activation volume in the range 100-200 ų. Advanced high-resolution transmission electron microscopy imaging and spectroscopy exhibit a very fine glassy nanostructure with well-defined dense Ni-rich clusters embedded in Zr-rich clusters of lower atomic density and a ~2-3 nm characteristic length scale. Nanobeam electron diffraction analysis reveals that the accumulation of plas

SUBMITTER: Idrissi H 

PROVIDER: S-EPMC6749058 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature