Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms

Autor(es):Mostrar menos -

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

Afiliação do(s) autor(es)

^[1] Univ Calif Davis, Dept Mat Sci & Engn, Davis, CA 95616 - USA

^[2] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 - USA

^[3] Energy & Nucl Res Inst, POB 11049, Sao Paulo - Brazil

^[4] Purdue Univ, Sch Mat Engn, W Lafayette, IN 47907 - USA

^[5] Sun Yat Sen Univ, Sch Chem Engn & Technol, Zhuhai 519082 - Peoples R China

^[6] Sandia Natl Labs, Mat Phys & Chem Sci, Albuquerque, NM 87185 - USA

• Tipo de documento: Artigo Científico
• Fonte: ACTA MATERIALIA; v. 200, p. 1008-1021, NOV 2020.
• Citações Web of Science: 0

Resumo

This work uses a combination of stress dependent single grain boundary Coble creep and zero-creep experiments to measure interfacial energies, along with grain boundary point defect formation and migration volumes in cubic ZrO2. These data, along with interfacial diffusivities measured in a companion paper are then applied to analyzing two-particle sintering. The analysis presented indicates that the large activation volume, v({*}) = v(f) + v(m) primarily derives from a large migration volume and suggests that the grain boundary rate limiting defects are delocalized, possibly due to electrostatic interactions between charge compensating defects. The discrete nature of the sintering and creep process observed in the small-scale experiments supports the hypothesis that grain boundary dislocations serve as sources and sinks for grain boundary point defects and facilitate strain during sintering and Coble creep. Model two-particle sintering experiments demonstrate that initial-stage densification follows interface reaction rate-limited kinetics. (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