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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.)

In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO2

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Author(s):
Grosso, Robson L. [1, 2, 3] ; Muccillo, Eliana N. S. [3] ; Muche, Dereck N. F. [2] ; Jawaharram, Gowtham S. [1] ; Barr, Christopher M. [4] ; Monterrosa, Anthony M. [4] ; Castro, Ricardo H. R. [2] ; Hattar, Khalid [4] ; Dillon, Shen J. [1]
Total Authors: 9
Affiliation:
[1] Univ Illinois, Urbana, IL 61801 - USA
[2] Univ Calif Davis, Davis, CA 95616 - USA
[3] Energy & Nucl Res Inst IPEN, Sao Paulo - Brazil
[4] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 - USA
Total Affiliations: 4
Document type: Journal article
Source: Nano Letters; v. 20, n. 2, p. 1041-1046, FEB 2020.
Web of Science Citations: 0
Abstract

This work demonstrates a novel approach to ultrahigh-temperature mechanical testing using a combination of in situ nanomechanical testing and localized laser heating. The methodology is applied to characterizing and testing initially nanograined 10 mol % Sc2O3-stabilized ZrO2 up to its melting temperature. The results suggest that the low-temperature strength of nanograined, d < 50 nm, oxides is not influenced by creep. Tensile fracture of ZrO2 bicrystals produce a weak-temperature dependence suggesting that grain boundary energy dominates brittle fracture of grain boundaries even at high homologous temperatures; for example, T = 2050 degrees C or T approximate to 77% T-melt. The maximum temperature for mechanical testing in this work is primarily limited by the instability of the sample, due to evaporation or melting, enabling a host of new opportunities for testing materials in the ultrahigh-temperature regime. (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