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Title: Ductility and work hardening in nano-sized metallic glasses

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Journal Article: Publisher's Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 106; Journal Issue: 6; Related Information: CHORUS Timestamp: 2016-12-29 10:22:35; Journal ID: ISSN 0003-6951
American Institute of Physics
Country of Publication:
United States

Citation Formats

Chen, D. Z., Gu, X. W., An, Q., Goddard, III, W. A., and Greer, J. R. Ductility and work hardening in nano-sized metallic glasses. United States: N. p., 2015. Web. doi:10.1063/1.4907773.
Chen, D. Z., Gu, X. W., An, Q., Goddard, III, W. A., & Greer, J. R. Ductility and work hardening in nano-sized metallic glasses. United States. doi:10.1063/1.4907773.
Chen, D. Z., Gu, X. W., An, Q., Goddard, III, W. A., and Greer, J. R. 2015. "Ductility and work hardening in nano-sized metallic glasses". United States. doi:10.1063/1.4907773.
title = {Ductility and work hardening in nano-sized metallic glasses},
author = {Chen, D. Z. and Gu, X. W. and An, Q. and Goddard, III, W. A. and Greer, J. R.},
abstractNote = {},
doi = {10.1063/1.4907773},
journal = {Applied Physics Letters},
number = 6,
volume = 106,
place = {United States},
year = 2015,
month = 2

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1063/1.4907773

Citation Metrics:
Cited by: 7works
Citation information provided by
Web of Science

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  • In-situ nano-tensile experiments on 70 nm-diameter free-standing electroplated NiP metallic glass nanostructures reveal tensile true strains of ∼18%, an amount comparable to compositionally identical 100 nm-diameter focused ion beam samples and ∼3 times greater than 100 nm-diameter electroplated samples. Simultaneous in-situ observations and stress-strain data during post-elastic deformation reveal necking and work hardening, features uncharacteristic for metallic glasses. The evolution of free volume within molecular dynamics-simulated samples suggests a free surface-mediated relaxation mechanism in nano-sized metallic glasses.
  • 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 annealingmore » 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.« less