Journal
SCRIPTA MATERIALIA
Volume 188, Issue -, Pages 228-232Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.07.033
Keywords
Defects; Room-temperature plasticity; Dislocation nucleation and motion; Nanoindentation; SrTiO3
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Funding
- Deutsche Forschungsgemeinschaft [DU 424/11-1, 414179371]
- JST PRESTO [JPMJPR199]
- JSPS KAKENHI, Japan [JP19H05786, JP17H06094, JP18H03840]
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Incipient room-temperature plastic deformation in single-crystal SrTiO3 at the nanoscale and the microscale is contrasted by applying a scale-dependent indentation technique. Using nanoindentation popin, nanoindentation creep, and an evaluation of dislocation spacing via etch pit study, we demonstrate a reversal of yield stress for crystals with different vacancy concentrations and pre-existing dislocation densities. A competing mechanism between dislocation nucleation and dislocation motion on crystal plasticity at different length scales is highlighted. This finding enables us to complete the understanding of dislocation-mediated plasticity for ceramic oxides at the nanoscale as compared to the microscale and macroscale. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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