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Title: Sink property of metallic glass free surfaces

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep08877· OSTI ID:1192024
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [6]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Nuclear Engineering, Dept. of Materials Science and Engineering.
  2. Peking Univ., Beijing (China). School of Physics.
  3. Texas A & M Univ., College Station, TX (United States). Dept. of Nuclear Engineering.
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Tohoku Univ., Sendai (Japan). Inst. for Materials Research.
  6. Oklahoma State Univ., Stillwater, OK (United States). School of Mechanical and Aerospace Engineering.

When heated to a temperature close to glass transition temperature, metallic glasses (MGs) begin to crystallize. Under deformation or particle irradiation, crystallization occurs at even lower temperatures. Hence, phase instability represents an application limit for MGs. Here, we report that MG membranes of a few nanometers thickness exhibit properties different from their bulk MG counterparts. The study uses in situ transmission electron microscopy with concurrent heavy ion irradiation and annealing to observe crystallization behaviors of MGs. For relatively thick membranes, ion irradiations introduce excessive free volumes and thus induce nanocrystal formation at a temperature linearly decreasing with increasing ion fluences. For ultra-thin membranes, however, the critical temperature to initiate crystallization is about 100 K higher than the bulk glass transition temperature. Molecular dynamics simulations indicate that this effect is due to the sink property of the surfaces which can effectively remove excessive free volumes. These findings suggest that nanostructured MGs having a higher surface to volume ratio are expected to have higher crystallization resistance, which could pave new paths for materials applications in harsh environments requiring higher stabilities.

Research Organization:
Texas A & M Univ., College Station, TX (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE
Grant/Contract Number:
FE0004007; AC52-06NA25396; AC02-06CH11357
OSTI ID:
1192024
Alternate ID(s):
OSTI ID: 1215616; OSTI ID: 1221770
Journal Information:
Scientific Reports, Vol. 5, Issue C; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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