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

Vikrant, K. S.N.; Grosso, Robson L.; Feng, Lin; Muccillo, Eliana N.S.; Muche, Dereck N.F.; Jawaharram, Gowtham S.; Barr, Christopher M.; Monterrosa, Anthony M.; Castro, Ricardo H.R.; García, R. Edwin; Hattar, Khalid; Dillon, Shen J.

doi:10.1016/j.actamat.2020.08.069

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

Journal Article · Fri Aug 28 00:00:00 EDT 2020 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2020.08.069· OSTI ID:1667414

Vikrant, K. S.N. ^[1]; Grosso, Robson L. ^[2]; Feng, Lin ^[3]; Muccillo, Eliana N.S. ^[4]; Muche, Dereck N.F. ^[5]; Jawaharram, Gowtham S. ^[6]; Barr, Christopher M. ^[7]; Monterrosa, Anthony M. ^[7]; Castro, Ricardo H.R. ^[5]; García, R. Edwin ^[1]; Hattar, Khalid ^[7]; Dillon, Shen J. ^[6]

Purdue Univ., West Lafayette, IN (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States); Energy and Nuclear Research Inst., Sao Paul (Brazil); Univ. of California, Davis, CA (United States)
Sun Yat-sen Univ., Zhuhai (China)
Energy and Nuclear Research Inst., Sao Paul (Brazil)
Univ. of California, Davis, CA (United States)
Univ. of Illinois at Urbana-Champaign, IL (United States)
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 $$D_s = (0.10 ± 0.27)exp(\frac{-380,000 ± 28,000}{RT}) m^2 s^{-1}$$.

View Accepted Manuscript (DOE)

Research Organization:: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); US Army Research Office (ARO); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC04-94AL85000; NA0003525

OSTI ID:: 1667414

Report Number(s):: SAND--2020-9025J; 690249

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Vol. 199; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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