Strain rate dependence of the slip transfer through a penetrable high angle grain boundary in copper

Micro pillar compression is used to analyze the strain rate dependence of copper pillars containing a penetrable high-angle grain boundary via in situ compression tests at strain rates ranging from 10−1 to 10−4s−1. While the grain-boundary containing pillars exhibit a clear strain-rate dependence of...

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Bibliographic Details
Published in:Scripta materialia 2017-09, Vol.138, p.88-91
Main Authors: Malyar, N.V., Dehm, G., Kirchlechner, C.
Format: Article
Language:English
Subjects:
Dislocation transmission
Grain boundary
in situ compression tests
Micromechanics
Strain rate sensitivity
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Summary:Micro pillar compression is used to analyze the strain rate dependence of copper pillars containing a penetrable high-angle grain boundary via in situ compression tests at strain rates ranging from 10−1 to 10−4s−1. While the grain-boundary containing pillars exhibit a clear strain-rate dependence of m=0.04±0.02, their single crystal counterparts seem to have a weak strain rate dependence of m=0.01±0.01. The results strongly suggest that the movement of the dislocation line in the grain boundary, required to change its orientation from the incoming to the outgoing slip plane, is the critical process in deforming this kind of grain-boundary containing pillars. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2017.05.042