In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO 2 .

Autor: Grosso RL; Department of Materials Science and Engineering , University of Illinois Urbana-Champaign , Urbana , Illinois 61801 , United States.; Energy and Nuclear Research Institute - IPEN , P.O. Box, São Paulo 11049, Brazil.; Department of Materials Science and Engineering , University of California - Davis , Davis , California 95616 , United States., Muccillo ENS; Energy and Nuclear Research Institute - IPEN , P.O. Box, São Paulo 11049, Brazil., Muche DNF; Department of Materials Science and Engineering , University of California - Davis , Davis , California 95616 , United States., Jawaharram GS; Department of Materials Science and Engineering , University of Illinois Urbana-Champaign , Urbana , Illinois 61801 , United States., Barr CM; Materials, Physical, and Chemical Sciences , Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States., Monterrosa AM; Materials, Physical, and Chemical Sciences , Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States., Castro RHR; Department of Materials Science and Engineering , University of California - Davis , Davis , California 95616 , United States., Hattar K; Materials, Physical, and Chemical Sciences , Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States., Dillon SJ; Department of Materials Science and Engineering , University of Illinois Urbana-Champaign , Urbana , Illinois 61801 , United States.
Jazyk: angličtina
Zdroj: Nano letters [Nano Lett] 2020 Feb 12; Vol. 20 (2), pp. 1041-1046. Date of Electronic Publication: 2020 Jan 16.
DOI: 10.1021/acs.nanolett.9b04205
Abstrakt: 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 % Sc 2 O 3 -stabilized ZrO 2 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 ZrO 2 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 °C or T ≈ 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.
Databáze: MEDLINE
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