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

Abstract

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 themore » 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

Authors:
 [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:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1348209
Alternate Identifier(s):
OSTI ID: 1358715
Grant/Contract Number:  
AC02-76SF00515; DGE-1144469; SC0006599; NNX12AQ49G; NAKFI ANT1; FG02-99ER45775; U1530402
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 118; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metallic glass; ductility; in situ tension test; molecular dynamics; synchrotron XRD

Citation Formats

Liontas, Rachel, Jafary-Zadeh, Mehdi, Zeng, Qiaoshi, Zhang, Yong -Wei, Mao, Wendy L., and Greer, Julia R. Substantial tensile ductility in sputtered Zr-Ni-Al nano-sized metallic glass. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.07.050.
Liontas, Rachel, Jafary-Zadeh, Mehdi, Zeng, Qiaoshi, Zhang, Yong -Wei, Mao, Wendy L., & Greer, Julia R. Substantial tensile ductility in sputtered Zr-Ni-Al nano-sized metallic glass. United States. https://doi.org/10.1016/j.actamat.2016.07.050
Liontas, Rachel, Jafary-Zadeh, Mehdi, Zeng, Qiaoshi, Zhang, Yong -Wei, Mao, Wendy L., and Greer, Julia R. Thu . "Substantial tensile ductility in sputtered Zr-Ni-Al nano-sized metallic glass". United States. https://doi.org/10.1016/j.actamat.2016.07.050. https://www.osti.gov/servlets/purl/1348209.
@article{osti_1348209,
title = {Substantial tensile ductility in sputtered Zr-Ni-Al nano-sized metallic glass},
author = {Liontas, Rachel and Jafary-Zadeh, Mehdi and Zeng, Qiaoshi and Zhang, Yong -Wei and Mao, Wendy L. and Greer, Julia R.},
abstractNote = {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.},
doi = {10.1016/j.actamat.2016.07.050},
journal = {Acta Materialia},
number = C,
volume = 118,
place = {United States},
year = {Thu Aug 04 00:00:00 EDT 2016},
month = {Thu Aug 04 00:00:00 EDT 2016}
}

Journal Article:

Citation Metrics:
Cited by: 44 works
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Figures / Tables:

Figure A.1 Figure A.1: Uniaxial compression experiments on FIB-fabricated Zr-Ni-Al specimens, including engineering stress-strain results on (a) “small” specimens with diameters ≤ 555 nm and (b) “large” specimens with diameters ≥ 890 nm; post-compression images on specimens with initial diameters of (c) 492 nm, (d) 540 nm, (e) 1300 nm, and (f)more » 1560 nm.« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.