Strain hardening and dislocation avalanches in micrometer-sized dimensions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F15%3A43925564" target="_blank" >RIV/49777513:23640/15:43925564 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1016/j.actamat.2015.02.027" target="_blank" >http://dx.doi.org/10.1016/j.actamat.2015.02.027</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.actamat.2015.02.027" target="_blank" >10.1016/j.actamat.2015.02.027</a>

Result language
angličtina
Original language name
Strain hardening and dislocation avalanches in micrometer-sized dimensions
Original language description
Present experiments and computational simulations furnish a fundamental background to the understanding of plastic flow across sample sizes. It is shown that self-organized criticality (SOC) governs the size distribution of dislocation avalanches in micrometer-sized sample dimensions. Onset of SOC denotes inception of a dislocation network so that dislocation avalanches occur at constant criticality level irrespectively of the applied stress. In these microcrystals, we find that the ratio between the characteristic sample dimension and the mean free path traveled by the mobile dislocations, D/LeffD/Leff, rules the onset of strain hardening. This index simultaneously accounts for the role of loading orientation and dislocation density upon microscale plasticity. It is shown that strain-hardening emerges for D/Leff>2D/Leff>2, where surface dislocation annihilations are inconsequential to network development and the flow stress scales with dislocation density. This regime naturally evolve
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2015
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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