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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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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]
Total Authors: 12
Affiliation:
[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
Total Affiliations: 6
Document type: Journal article
Source: ACTA MATERIALIA; v. 200, p. 1008-1021, NOV 2020.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 16/06205-1 - Characterization of nanostructured scandia-zirconia ceramics consolidated by spark plasma sintering.
Grantee:Robson Lopes Grosso
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 17/25501-3 - Grain size dependent phase transition and Hall-Petch relationship in nanocrystalline Scandia-Zirconia: an in-situ TEM study
Grantee:Robson Lopes Grosso
Support Opportunities: Scholarships abroad - Research Internship - Post-doctor