Journal
ULTRAMICROSCOPY
Volume 142, Issue -, Pages 1-9Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultramic.2014.03.006
Keywords
HAADF-STEM; EELS; Nanobeam diffraction; Metallic glass; Shear band
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Funding
- Deutsche Forschungsgemeinschaft (SPP 1594, Topological engineering of ultra-strong glasses)
- Karlsruhe Nano Micro Facility a Helmholtz research infrastructure at Karlsruhe Institute of Technology
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Density changes between sheared zones and their surrounding amorphous matrix as a result of plastic deformation in a cold-rolled metallic glass (melt-spun Al88Y7Fe5) were determined using high-angle annular dark-held (HAADF) detector intensities supplemented by electron-energy loss spectroscopy (EELS), energy-dispersive X-ray (EDX) and nano-beam diffraction analyses. Sheared zones or shear bands were observed as regions of bright or dark contrast arising from a higher or lower density relative to the matrix. Moreover, abrupt contrast changes from bright to dark and vice versa were found within individual shear bands. We associate the decrease in density mainly with an enhanced free volume in the shear bands and the increase in density with concomitant changes of the mass. This interpretation is further supported by changes in the zero loss and Plasmon signal originating from such sites. The limits of this new approach are discussed. (C) 2014 Elsevier B.V. All rights reserved,
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