Journal
NATURE MATERIALS
Volume 8, Issue 2, Pages 95-100Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NMAT2370
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Funding
- Austrian Academy of Sciences
- Korea Basic Science Institute [N28078]
- Centre National de la Recherche Scientifique
- National Research Council of Science & Technology (NST), Republic of Korea [T29400] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Smaller is stronger' does not hold true only for nanocrystalline materials(1) but also for single crystals(2-5). It is argued that this effect is caused by geometrical constraints on the nucleation and motion of dislocations in submicrometre-sized crystals(6,7). Here, we report the first in situ transmission electron microscopy tensile tests of a submicrometre aluminium single crystal that are capable of providing direct insight into source-controlled dislocation plasticity in a submicrometre crystal. Single-ended sources emit dislocations that escape the crystal before being able to multiply. As dislocation nucleation and loss rates are counterbalanced at about 0.2 events per second, the dislocation density remains statistically constant throughout the deformation at strain rates of about 10(-4) s(-1). However, a sudden increase in strain rate to 10(-3) s(-1) causes a noticeable surge in dislocation density as the nucleation rate outweighs the loss rate. This observation indicates that the deformation of submicrometre crystals is strain-rate sensitive.
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