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Title: Substantial tensile ductility in sputtered Zr-Ni-Al nano-sized metallic glass

We investigate the mechanical behavior and atomic-level structure of glassy Zr-Ni-Al nano-tensile specimens with widths between 75 and 215 nm. We focus our studies on two different energy states: (1) as-sputtered and (2) sputtered then annealed below the glass transition temperature (T g). In-situ tensile experiments conducted inside a scanning electron microscope (SEM) reveal substantial tensile ductility in some cases reaching >10% engineering plastic strains, >150% true plastic strains, and necking down to a point during tensile straining in specimens as wide as ~150 nm. We found the extent of ductility depends on both the specimen size and the annealing conditions. Using molecular dynamics (MD) simulations, transmission electron microscopy (TEM), and synchrotron x-ray diffraction (XRD), we explain the observed mechanical behavior through changes in free volume as well as short- and medium-range atomic-level order that occur upon annealing. This work demonstrates the importance of carefully choosing the metallic glass fabrication method and post-processing conditions for achieving a certain atomic-level structure and free volume within the metallic glass, which then determine the overall mechanical response. Lastly, an important implication is that sputter deposition may be a particularly promising technique for producing thin coatings of metallic glasses with significant ductility, due tomore » the high level of disorder and excess free volume resulting from the sputtering process and to the suitability of sputtering for producing thin coatings that may exhibit enhanced size-induced ductility.« less
 [1] ;  [2] ;  [3] ;  [2] ;  [4] ;  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Institute of High Performance Computing (IHPC) (Singapore)
  3. Center for High Pressure Science and Technology Advanced Research (HPSTAR), Shanghai (People's Republic of China); Carnegie Institution of Washington, Argonne, IL (United States)
  4. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Publication Date:
Grant/Contract Number:
AC02-76SF00515; DGE-1144469; SC0006599; NNX12AQ49G; NAKFI ANT1; FG02-99ER45775; U1530402
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 118; Journal Issue: C; Journal ID: ISSN 1359-6454
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Country of Publication:
United States
36 MATERIALS SCIENCE; metallic glass; ductility; in situ tension test; molecular dynamics; synchrotron XRD
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1358715