title: Revealing anelasticity and structural rearrangements in nanoscale metallic glass films usingin situTEM diffraction.
abstract: We used a novel diffraction-based method to extract the local, atomic-level elastic strain in nanoscale amorphous TiAl films duringin situtransmission electron microscopy deformation, while simultaneously measuring the macroscopic strain. The complementary strain measurements revealed significant anelastic deformation, which was independently confirmed by strain rate experiments. Furthermore, the distribution of first nearest-neighbor distances became narrower during loading and permanent changes were observed in the atomic structure upon unloading, even in the absence of macroscopic plasticity. The results demonstrate the capability ofin situelectron diffraction to probe structural rearrangements and decouple elastic and anelastic deformation in metallic glasses.
authors.affiliation: Department of Materials Science and Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University , Tempe , AZ , USA.
authors.forename: Rohit
authors.initials: R
authors.lastname: Sarkar
authors.affiliation: Physics of Nanostructured Materials, Faculty of Physics, University of Vienna , Vienna , Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Ebner
authors.affiliation: Department of Mechanical and Aerospace Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University , Tempe , AZ , USA.
authors.forename: Ehsan
authors.initials: E
authors.lastname: Izadi
authors.affiliation: Physics of Nanostructured Materials, Faculty of Physics, University of Vienna , Vienna , Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Rentenberger
authors.affiliation: Department of Materials Science and Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, USA; Department of Mechanical and Aerospace Engineering, School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ, USA.
authors.forename: Jagannathan
authors.identifier: 0000-0002-0146-0805
authors.initials: J
authors.lastname: Rajagopalan
keywords: Metallic glass; atomic rearrangements; in situ electron diffraction; local elastic strain; strain rate experiments