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

Journal Article · · Acta Materialia
 [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)

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 (Tg). 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 to 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515; DGE-1144469; SC0006599; NNX12AQ49G; NAKFI ANT1; FG02-99ER45775; U1530402
OSTI ID:
1348209
Alternate ID(s):
OSTI ID: 1358715
Journal Information:
Acta Materialia, Vol. 118, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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Anharmonic model for the elastic constants of bulk metallic glass across the glass transition journal January 2018
Irradiation Enhances Strength and Deformability of Nano-Architected Metallic Glass journal February 2018
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Figures / Tables (4)