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Title: Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in zirconia I: Nanowire growth and interfacial diffusivity

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [5];  [1];  [7];  [6]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States); Energy and Nuclear Research Inst., Sao Paul (Brazil); Univ. of California, Davis, CA (United States)
  3. Sun Yat-sen Univ., Zhuhai (China)
  4. Energy and Nuclear Research Inst., Sao Paul (Brazil)
  5. Univ. of California, Davis, CA (United States)
  6. Univ. of Illinois at Urbana-Champaign, IL (United States)
  7. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

This study demonstrates novel in situ transmission electron microscopy-based microscale single grain boundary Coble creep experiments used to grow nanowires through a solid-state process in cubic ZrO2 between ≈ 1200 °C and ≈ 2100 °C. Experiments indicate Coble creep drives the formation of nanowires from asperity contacts during tensile displacement, which is confirmed by phase field simulations. The experiments also facilitate efficient measurement of grain boundary diffusivity and surface diffusivity. 10 mol% Sc2O3 doped ZrO2 is found to have a cation grain boundary diffusivity of $$D_{gb} = (0.056 ± 0.05)exp (\frac{-380,000±41,000}{RT})m^2 s^{-1}$$, and $$D_s = (0.10 ± 0.27)exp(\frac{-380,000 ± 28,000}{RT}) m^2 s^{-1}$$.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); US Army Research Office (ARO); National Science Foundation (NSF)
Grant/Contract Number:
AC04-94AL85000; NA-0003525; DMR 1922867; W911NF1810361; W911NF1710026; N00014- 17-1-2087; FWP 15013170
OSTI ID:
1667414
Report Number(s):
SAND-2020-9025J; 690249
Journal Information:
Acta Materialia, Vol. 199; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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