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Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au

Authorized Users Only
2012
Authors
Radetić, Tamara
Ophus, Colin
Olmsted, D. L.
Asta, M.
Dahmen, U.
Article (Published version)
Metadata
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Abstract
This work investigates the mechanism and dynamics of grain boundary migration driven by capillary forces via in situ electron microscopy, complemented by molecular-dynamics simulations. Using thin films of Au with the mazed bicrystal geometry, the shrinkage of island grains with 90 degrees lt 110 gt tilt grain boundaries was observed by diffraction contrast and high-resolution imaging. The grains remained cylindrical throughout the shrinkage, and there was no measurable grain rotation even at very small sizes. The rate of shrinkage was found to be erratic and inconsistent with parabolic kinetics, accelerating before complete disappearance. Residual defects were found immediately after complete shrinkage, although the type and magnitude of the defects varied from grain to grain. Measurement of the grain boundary shape anisotropy showed a preference for facets on low-index planes of the crystals, including the mirror-symmetry planes of the bicrystal. These facets were also found dire...ctly on individual images extracted from high-resolution video recordings of shrinking grains at similar to 300 degrees C. The dynamics of boundary motion were found to be limited by nucleation and propagation of steps on these facets. The cylindrical geometry and size of the experimentally observed island grains allow direct comparison with molecular-dynamics simulations on the same length scale, which reproduced many of the experimentally observed features, including non-parabolic shrinkage, absence of systematic grain rotation, step-controlled migration and dislocation debris after complete grain shrinkage. Differences between model and experiment are discussed in terms of the possible role of impurities, surfaces and interfacial steps.

Keywords:
Island grain / Bicrystal film / Capillary forces / Interface facets / Interface migration
Source:
Acta Materialia, 2012, 60, 20, 7051-7063
Publisher:
  • Pergamon-Elsevier Science Ltd, Oxford
Funding / projects:
  • Office of Science, Office of Basic Energy Sciences, of the U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-AC02-05CH11231]
  • Office of Science, Office of Basic Energy Sciences, of the U.S. Department of EnergyUnited States Department of Energy (DOE) [DE-AC02-05CH11231]

DOI: 10.1016/j.actamat.2012.09.012

ISSN: 1359-6454

WoS: 000312679600017

Scopus: 2-s2.0-84868196300
[ Google Scholar ]
29
21
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2150
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Radetić, Tamara
AU  - Ophus, Colin
AU  - Olmsted, D. L.
AU  - Asta, M.
AU  - Dahmen, U.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/2150
AB  - This work investigates the mechanism and dynamics of grain boundary migration driven by capillary forces via in situ electron microscopy, complemented by molecular-dynamics simulations. Using thin films of Au with the mazed bicrystal geometry, the shrinkage of island grains with 90 degrees  lt  110  gt  tilt grain boundaries was observed by diffraction contrast and high-resolution imaging. The grains remained cylindrical throughout the shrinkage, and there was no measurable grain rotation even at very small sizes. The rate of shrinkage was found to be erratic and inconsistent with parabolic kinetics, accelerating before complete disappearance. Residual defects were found immediately after complete shrinkage, although the type and magnitude of the defects varied from grain to grain. Measurement of the grain boundary shape anisotropy showed a preference for facets on low-index planes of the crystals, including the mirror-symmetry planes of the bicrystal. These facets were also found directly on individual images extracted from high-resolution video recordings of shrinking grains at similar to 300 degrees C. The dynamics of boundary motion were found to be limited by nucleation and propagation of steps on these facets. The cylindrical geometry and size of the experimentally observed island grains allow direct comparison with molecular-dynamics simulations on the same length scale, which reproduced many of the experimentally observed features, including non-parabolic shrinkage, absence of systematic grain rotation, step-controlled migration and dislocation debris after complete grain shrinkage. Differences between model and experiment are discussed in terms of the possible role of impurities, surfaces and interfacial steps.
PB  - Pergamon-Elsevier Science Ltd, Oxford
T2  - Acta Materialia
T1  - Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au
EP  - 7063
IS  - 20
SP  - 7051
VL  - 60
DO  - 10.1016/j.actamat.2012.09.012
ER  - 
@article{
author = "Radetić, Tamara and Ophus, Colin and Olmsted, D. L. and Asta, M. and Dahmen, U.",
year = "2012",
abstract = "This work investigates the mechanism and dynamics of grain boundary migration driven by capillary forces via in situ electron microscopy, complemented by molecular-dynamics simulations. Using thin films of Au with the mazed bicrystal geometry, the shrinkage of island grains with 90 degrees  lt  110  gt  tilt grain boundaries was observed by diffraction contrast and high-resolution imaging. The grains remained cylindrical throughout the shrinkage, and there was no measurable grain rotation even at very small sizes. The rate of shrinkage was found to be erratic and inconsistent with parabolic kinetics, accelerating before complete disappearance. Residual defects were found immediately after complete shrinkage, although the type and magnitude of the defects varied from grain to grain. Measurement of the grain boundary shape anisotropy showed a preference for facets on low-index planes of the crystals, including the mirror-symmetry planes of the bicrystal. These facets were also found directly on individual images extracted from high-resolution video recordings of shrinking grains at similar to 300 degrees C. The dynamics of boundary motion were found to be limited by nucleation and propagation of steps on these facets. The cylindrical geometry and size of the experimentally observed island grains allow direct comparison with molecular-dynamics simulations on the same length scale, which reproduced many of the experimentally observed features, including non-parabolic shrinkage, absence of systematic grain rotation, step-controlled migration and dislocation debris after complete grain shrinkage. Differences between model and experiment are discussed in terms of the possible role of impurities, surfaces and interfacial steps.",
publisher = "Pergamon-Elsevier Science Ltd, Oxford",
journal = "Acta Materialia",
title = "Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au",
pages = "7063-7051",
number = "20",
volume = "60",
doi = "10.1016/j.actamat.2012.09.012"
}
Radetić, T., Ophus, C., Olmsted, D. L., Asta, M.,& Dahmen, U.. (2012). Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au. in Acta Materialia
Pergamon-Elsevier Science Ltd, Oxford., 60(20), 7051-7063.
https://doi.org/10.1016/j.actamat.2012.09.012
Radetić T, Ophus C, Olmsted DL, Asta M, Dahmen U. Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au. in Acta Materialia. 2012;60(20):7051-7063.
doi:10.1016/j.actamat.2012.09.012 .
Radetić, Tamara, Ophus, Colin, Olmsted, D. L., Asta, M., Dahmen, U., "Mechanism and dynamics of shrinking island grains in mazed bicrystal thin films of Au" in Acta Materialia, 60, no. 20 (2012):7051-7063,
https://doi.org/10.1016/j.actamat.2012.09.012 . .

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