TY - JOUR
T1 - Effects of orientation and pre-deformation on velocity profiles of dislocation avalanches in gold microcrystals
AU - Sparks, Gregory
AU - Maaß, Robert
N1 - Funding Information:
The authors thank L.W. McFaul, W.J. Wright, and K.A. Dahmen for fruitful discussions regarding mechanical resonances and denoising of experimental data. This research was carried out in part in the Frederick Seitz Materials Research Laboratory Central Research Facilities, University of Illinois. R.M. is grateful for financial support by the NSF CAREER program (grant NSF DMR 1654065), and for start-up funds provided by the Department of Materials Science and Engineering at UIUC.
Publisher Copyright:
© 2019, EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - Abstract: We report on the spatiotemporal dynamics of dislocation avalanches (crystallographic slip) in gold microcrystals with different orientations and also different initial dislocation densities. It is found that the size-integrated averaged velocity profiles have both orientation-dependent and initial-microstructure-dependent peak velocities and velocity decays. With increasing symmetry and apparent strain-hardening rate, the peak velocities decrease and the velocity of the average shape profile decays more slowly with time. These experimental results indicate the material-specific nature of collective dislocation rearrangements that underlie slip events with a net magnitude of a few to several hundred Burgers vectors in the studied microcrystals. Furthermore, we point toward sensitivity to filtering details that may significantly affect conclusions when comparing experiment with theory. Graphical abstract: [Figure not available: see fulltext.].
AB - Abstract: We report on the spatiotemporal dynamics of dislocation avalanches (crystallographic slip) in gold microcrystals with different orientations and also different initial dislocation densities. It is found that the size-integrated averaged velocity profiles have both orientation-dependent and initial-microstructure-dependent peak velocities and velocity decays. With increasing symmetry and apparent strain-hardening rate, the peak velocities decrease and the velocity of the average shape profile decays more slowly with time. These experimental results indicate the material-specific nature of collective dislocation rearrangements that underlie slip events with a net magnitude of a few to several hundred Burgers vectors in the studied microcrystals. Furthermore, we point toward sensitivity to filtering details that may significantly affect conclusions when comparing experiment with theory. Graphical abstract: [Figure not available: see fulltext.].
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U2 - 10.1140/epjb/e2018-90586-5
DO - 10.1140/epjb/e2018-90586-5
M3 - Article
AN - SCOPUS:85060177910
SN - 1434-6028
VL - 92
JO - European Physical Journal B
JF - European Physical Journal B
IS - 1
M1 - 15
ER -