With decreasing system sizes, the mechanical properties and dominant deformation mechanisms of metals change. For larger scales, bulk behavior is observed that is characterized by a preservation and significant increase of dislocation content during deformation whereas at the submicron scale very localized dislocation activity as well as dislocation starvation is observed. In the transition regime it is not clear how the dislocation content is built up. This dislocation storage regime and its underlying physical mechanisms are still an open field of research. In this paper, the microstructure evolution of single crystalline copper micropillars with a crystal orientation and varying sizes between and 10 is analysed under compression loading. Experimental in situ HR-EBSD measurements as well as 3d continuum dislocation dynamics simulations are presented. The experimental results provide insights into the material deformation and evolution of dislocation structures during continuous loading. This is complemented by the simulation of the dislocation density evolution considering dislocation dynamics, interactions, and reactions of the individual slip systems providing direct access to these quantities. Results are presented that show, how the plastic deformation of the material takes place and how the different slip systems are involved. A central finding is, that an increasing amount of GND density is stored in the system during loading that is located dominantly on the slip systems that are not mainly responsible for the production of plastic slip. This might be a characteristic feature of the considered size regime that has direct impact on further dislocation network formation and the corresponding contribution to plastic hardening.
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Publié le :
Kolja Zoller 1 ; Szilvia Kalácska 2 ; Péter Dusán Ispánovity 3 ; Katrin Schulz 4, 5
@article{CRPHYS_2021__22_S3_267_0, author = {Kolja Zoller and Szilvia Kal\'acska and P\'eter Dus\'an Isp\'anovity and Katrin Schulz}, title = {Microstructure evolution of compressed micropillars investigated by \protect\emph{in situ} {HR-EBSD} analysis and dislocation density simulations}, journal = {Comptes Rendus. Physique}, pages = {267--293}, publisher = {Acad\'emie des sciences, Paris}, volume = {22}, number = {S3}, year = {2021}, doi = {10.5802/crphys.55}, language = {en}, }
TY - JOUR AU - Kolja Zoller AU - Szilvia Kalácska AU - Péter Dusán Ispánovity AU - Katrin Schulz TI - Microstructure evolution of compressed micropillars investigated by in situ HR-EBSD analysis and dislocation density simulations JO - Comptes Rendus. Physique PY - 2021 SP - 267 EP - 293 VL - 22 IS - S3 PB - Académie des sciences, Paris DO - 10.5802/crphys.55 LA - en ID - CRPHYS_2021__22_S3_267_0 ER -
%0 Journal Article %A Kolja Zoller %A Szilvia Kalácska %A Péter Dusán Ispánovity %A Katrin Schulz %T Microstructure evolution of compressed micropillars investigated by in situ HR-EBSD analysis and dislocation density simulations %J Comptes Rendus. Physique %D 2021 %P 267-293 %V 22 %N S3 %I Académie des sciences, Paris %R 10.5802/crphys.55 %G en %F CRPHYS_2021__22_S3_267_0
Kolja Zoller; Szilvia Kalácska; Péter Dusán Ispánovity; Katrin Schulz. Microstructure evolution of compressed micropillars investigated by in situ HR-EBSD analysis and dislocation density simulations. Comptes Rendus. Physique, Volume 22 (2021) no. S3, pp. 267-293. doi : 10.5802/crphys.55. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.55/
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