Javaid, Farhan ; Stukowski, Alexander ; Durst, Karsten (2016)
3D Dislocation Structure Evolution in Strontium Titanate: Spherical Indentation Experiments and MD Simulations.
In: Journal of the American Ceramic Society, 100 (3)
doi: 10.1111/jace.14626
Article, Bibliographie
Abstract
In the present work, the dislocation structure evolution around and underneath the spherical indentations in (001) oriented single crystalline strontium titanate (STO) was revealed by using an etch-pit technique and molecular dynamics (MD) simulations. The 3D defect structure at various length scales and subsurface depths was resolved with the help of a sequential polishing, etching, and imaging technique. This analysis, combined with load-displacement data, shows that the incipient plasticity (manifested as sudden indenter displacement bursts) is strongly influenced by preexisting dislocations. In the early stage of plastic deformation, the dislocation pile-ups are all aligned in 〈100〉 directions, lying on {110}45 planes, inclined at 45° to the (001) surface. At higher mean contact pressure and larger indentation depth, however, dislocation pile-ups along 〈110〉 directions appear, lying on {110}90 planes, perpendicular to the (100) surface. MD simulations confirm the glide plane nature and provide further insights into the dislocation formation mechanisms by tracing the evolution of the complete dislocation line network as function of indentation depth.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Javaid, Farhan ; Stukowski, Alexander ; Durst, Karsten |
| Type of entry: | Bibliographie |
| Title: | 3D Dislocation Structure Evolution in Strontium Titanate: Spherical Indentation Experiments and MD Simulations |
| Language: | English |
| Date: | 2 November 2016 |
| Journal or Publication Title: | Journal of the American Ceramic Society |
| Volume of the journal: | 100 |
| Issue Number: | 3 |
| DOI: | 10.1111/jace.14626 |
| URL / URN: | https://doi.org/10.1111/jace.14626 |
| Abstract: | In the present work, the dislocation structure evolution around and underneath the spherical indentations in (001) oriented single crystalline strontium titanate (STO) was revealed by using an etch-pit technique and molecular dynamics (MD) simulations. The 3D defect structure at various length scales and subsurface depths was resolved with the help of a sequential polishing, etching, and imaging technique. This analysis, combined with load-displacement data, shows that the incipient plasticity (manifested as sudden indenter displacement bursts) is strongly influenced by preexisting dislocations. In the early stage of plastic deformation, the dislocation pile-ups are all aligned in 〈100〉 directions, lying on {110}45 planes, inclined at 45° to the (001) surface. At higher mean contact pressure and larger indentation depth, however, dislocation pile-ups along 〈110〉 directions appear, lying on {110}90 planes, perpendicular to the (100) surface. MD simulations confirm the glide plane nature and provide further insights into the dislocation formation mechanisms by tracing the evolution of the complete dislocation line network as function of indentation depth. |
| Divisions: | 11 Department of Materials and Earth Sciences 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling 11 Department of Materials and Earth Sciences > Material Science > Physical Metallurgy |
| Date Deposited: | 27 Nov 2017 12:03 |
| Last Modified: | 29 Jan 2019 09:12 |
| PPN: | |
| Funders: | The authors gratefully acknowledge the funding from the Deutscher Akademischer Austaus chdienst (FJ) and the Gauss Centre for Supercomputing (GCS) for providing computing time through the John von Neumann Institute for Computing on the GCS share of, the supercomputer JUQUEEN at Jülich Supercomputing Centre. The authors would also like to thank Prof. Dr. Karsten Albe of TU Darmstadt for helpful discussion and critical examination of the paper, and Dr. Eric Patterson of TU Darmstadt for providing, STO single crystals. |
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