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Solid-state dewetting instability in thermally-stable nanocrystalline binary alloys

Journal Article · · Materialia
 [1];  [2];  [2];  [3];  [4]
  1. Univ. of California, Irvine, CA (United States); Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  3. Univ. of California, Irvine, CA (United States)
  4. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Oregon State Univ., Corvallis, OR (United States)
Practical applications of nanocrystalline metallic thin films are often limited by instabilities. Furthermore, in addition to grain growth, the thin film itself can become unstable and collapse into islands through solid-state dewetting. Additionally, selective alloying can improve nanocrystalline stability, but the impact of this approach on dewetting is not clear. In this study, two alloys that exhibit nanocrystalline thermal stability as ball milled powders are evaluated as thin films. While both alloys demonstrated dewetting behavior following annealing, the severity decreased in more dilute compositions. Ultimately, a balance may be struck between nanocrystalline stability and thin film structural stability by tuning dopant concentration.
Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000; NA0003525; SC0014232; SC0014664
OSTI ID:
1650162
Alternate ID(s):
OSTI ID: 1601493
Report Number(s):
SAND--2020-8365J; 689908
Journal Information:
Materialia, Journal Name: Materialia Vol. 9; ISSN 2589-1529
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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