Nanoscale to microscale reversal in room-temperature plasticity in SrTiO3 by tuning defect concentration

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 pop-in, nanoindentation creep, and an evaluation of dislocation spacing via etch pit study, we demonstr...

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Veröffentlicht in:Scripta materialia Jg. 188; S. 228 - 232
Hauptverfasser: Fang, Xufei, Ding, Kuan, Janocha, Stephan, Minnert, Christian, Rheinheimer, Wolfgang, Frömling, Till, Durst, Karsten, Nakamura, Atsutomo, Rödel, Jürgen
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 01.11.2020
Schlagworte:
Defects
Dislocation nucleation and motion
Nanoindentation
Room-temperature plasticity
SrTiO3
SrTiO3
Room-temperature plasticity
Dislocation nucleation and motion
Nanoindentation
Defects
ISSN:1359-6462, 1872-8456
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Zusammenfassung: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 pop-in, 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. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2020.07.033