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

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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. ; Garcia, R. Edwin ; Hattar, Khalid ; Dillon, Shen J.

• Tipo de documento: Artigo Científico
• Fonte: ACTA MATERIALIA; v. 199, p. 12-pg., 2020-10-15.

Resumo

This work 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 cu bic ZrO2 between approximate to 1200 degrees C and approximate to 2100 degrees C. Experiments indicate Coble creep drives the for mation 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(-380,000 +/- 41,000/RT)m(2) s(-1), s and surface diffusivity of D-s = (0.10 +/- 0.27)exp(-380,000 +/- 28,000/RT)m(2) s(-1). (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 16/06205-1 - Caracterização de cerâmicas de zircônia-escândia nanoestruturadas consolidadas por sinterização assistida por campo elétrico.
• Beneficiário: Robson Lopes Grosso
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/25501-3 - Transição de fase dependente do tamanho de grão e relação de Hall-Petch em zircônia-escândia nanocristalina: um estudo por MET in-situ
• Beneficiário: Robson Lopes Grosso
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado