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doi:10.22028/D291-31050
Titel: | Atomic Force Microscopy Study of Discrete Dislocation Pile-ups at Grain Boundaries in Bi-Crystalline Micro-Pillars |
VerfasserIn: | Chen, Xiaolei Richeton, Thiebaud Motz, Christian Berbenni, Stéphane |
Sprache: | Englisch |
Titel: | Crystals |
Bandnummer: | 10 |
Heft: | 5 |
Verlag/Plattform: | MDPI |
Erscheinungsjahr: | 2020 |
Freie Schlagwörter: | micromechanical testing micro-pillar bi-crystal discrete dislocation pile-up grain boundary free surface anisotropic elasticity crystallographic slip |
DDC-Sachgruppe: | 600 Technik |
Dokumenttyp: | Journalartikel / Zeitschriftenartikel |
Abstract: | Compression tests at low strains were performed to theoretically analyze the effects of anisotropic elasticity, misorientation, grain boundary (GB) stiffness, interfacial dislocations, free surfaces, and critical force on dislocation pile-ups in micro-sized Face-Centered Cubic (FCC) Nickel (Ni) and α -Brass bi-crystals. The spatial variations of slip heights due to localized slip bands terminating at GB were measured by Atomic Force Microscopy (AFM) to determine the Burgers vector distributions in the dislocation pile-ups. These distributions were then simulated by discrete pile-up micromechanical calculations in anisotropic bi-crystals consistent with the experimentally measured material parameters. The computations were based on the image decomposition method considering the effects of interphase GB and free surfaces in multilayered materials. For Ni and α -Brass, it was found that the best predicted step height spatial profiles were obtained considering anisotropic elasticity, free surface effects, a homogeneous external stress and a certain critical force in the material to equilibrate the dislocation pile-ups. |
DOI der Erstveröffentlichung: | 10.3390/cryst10050411 |
Link zu diesem Datensatz: | urn:nbn:de:bsz:291--ds-310502 hdl:20.500.11880/29236 http://dx.doi.org/10.22028/D291-31050 |
ISSN: | 2073-4352 |
Datum des Eintrags: | 10-Jun-2020 |
Fakultät: | NT - Naturwissenschaftlich- Technische Fakultät |
Fachrichtung: | NT - Materialwissenschaft und Werkstofftechnik |
Professur: | NT - Prof. Dr. Christian Motz |
Sammlung: | SciDok - Der Wissenschaftsserver der Universität des Saarlandes |
Dateien zu diesem Datensatz:
Datei | Beschreibung | Größe | Format | |
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crystals-10-00411-v2.pdf | 3,86 MB | Adobe PDF | Öffnen/Anzeigen |
Diese Ressource wurde unter folgender Copyright-Bestimmung veröffentlicht: Lizenz von Creative Commons