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Dynamic observations of dislocation/grain-boundary interactions in ice
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| Zeitschriftentitel: | Annals of Glaciology |
|---|---|
| Personen und Körperschaften: | , , , , , |
| In: | Annals of Glaciology, 31, 2000, S. 236-240 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
International Glaciological Society
|
| Schlagwörter: |
| author_facet |
Baker, I. Liu, F. Jia, K. Hu, X. Cullen, D. Dudley, M. Baker, I. Liu, F. Jia, K. Hu, X. Cullen, D. Dudley, M. |
|---|---|
| author |
Baker, I. Liu, F. Jia, K. Hu, X. Cullen, D. Dudley, M. |
| spellingShingle |
Baker, I. Liu, F. Jia, K. Hu, X. Cullen, D. Dudley, M. Annals of Glaciology Dynamic observations of dislocation/grain-boundary interactions in ice Earth-Surface Processes |
| author_sort |
baker, i. |
| spelling |
Baker, I. Liu, F. Jia, K. Hu, X. Cullen, D. Dudley, M. 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756400781820525 <jats:title>Abstract</jats:title><jats:p>Dislocation/grain-boundary (GB) interactions have been studied in situ in polycrystalline ice using synchrotron X-ray topography in the temperature range 0° to –15°C GBs were observed to act both as sources of lattice dislocations and as strong obstacles to dislocation motion. Dislocations were observed to form pile-ups at GBs upon loading. Generally the basal slip system with the highest Schmid factor was found to be the most active, and dislocations were emitted from GB facets as semi-hexagonal loops in order to relieve the stress build-up from GB sliding. When the relative orientation of two adjacent grains and the orientation of the GB between them with respect to the loading direction discouraged GB sliding, thus suppressing dislocation nucleation at the GB, dislocations originating in one grain piled up at the GB and led to slip transmission through the GB The latter geometrical arrangement is rarely encountered, suggesting that slip transmission through grain boundaries in ice is a rare event. When basal slip was suppressed, i.e. when the loading direction lay in the basal plane, slip occurred by the glide of a fast edge segment on non-basal planes.</jats:p> Dynamic observations of dislocation/grain-boundary interactions in ice Annals of Glaciology |
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| title |
Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_unstemmed |
Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_full |
Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_fullStr |
Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_full_unstemmed |
Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_short |
Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_sort |
dynamic observations of dislocation/grain-boundary interactions in ice |
| topic |
Earth-Surface Processes |
| url |
http://dx.doi.org/10.3189/172756400781820525 |
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2000 |
| physical |
236-240 |
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<jats:title>Abstract</jats:title><jats:p>Dislocation/grain-boundary (GB) interactions have been studied in situ in polycrystalline ice using synchrotron X-ray topography in the temperature range 0° to –15°C GBs were observed to act both as sources of lattice dislocations and as strong obstacles to dislocation motion. Dislocations were observed to form pile-ups at GBs upon loading. Generally the basal slip system with the highest Schmid factor was found to be the most active, and dislocations were emitted from GB facets as semi-hexagonal loops in order to relieve the stress build-up from GB sliding. When the relative orientation of two adjacent grains and the orientation of the GB between them with respect to the loading direction discouraged GB sliding, thus suppressing dislocation nucleation at the GB, dislocations originating in one grain piled up at the GB and led to slip transmission through the GB The latter geometrical arrangement is rarely encountered, suggesting that slip transmission through grain boundaries in ice is a rare event. When basal slip was suppressed, i.e. when the loading direction lay in the basal plane, slip occurred by the glide of a fast edge segment on non-basal planes.</jats:p> |
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| author | Baker, I., Liu, F., Jia, K., Hu, X., Cullen, D., Dudley, M. |
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| description | <jats:title>Abstract</jats:title><jats:p>Dislocation/grain-boundary (GB) interactions have been studied in situ in polycrystalline ice using synchrotron X-ray topography in the temperature range 0° to –15°C GBs were observed to act both as sources of lattice dislocations and as strong obstacles to dislocation motion. Dislocations were observed to form pile-ups at GBs upon loading. Generally the basal slip system with the highest Schmid factor was found to be the most active, and dislocations were emitted from GB facets as semi-hexagonal loops in order to relieve the stress build-up from GB sliding. When the relative orientation of two adjacent grains and the orientation of the GB between them with respect to the loading direction discouraged GB sliding, thus suppressing dislocation nucleation at the GB, dislocations originating in one grain piled up at the GB and led to slip transmission through the GB The latter geometrical arrangement is rarely encountered, suggesting that slip transmission through grain boundaries in ice is a rare event. When basal slip was suppressed, i.e. when the loading direction lay in the basal plane, slip occurred by the glide of a fast edge segment on non-basal planes.</jats:p> |
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| spelling | Baker, I. Liu, F. Jia, K. Hu, X. Cullen, D. Dudley, M. 0260-3055 1727-5644 International Glaciological Society Earth-Surface Processes http://dx.doi.org/10.3189/172756400781820525 <jats:title>Abstract</jats:title><jats:p>Dislocation/grain-boundary (GB) interactions have been studied in situ in polycrystalline ice using synchrotron X-ray topography in the temperature range 0° to –15°C GBs were observed to act both as sources of lattice dislocations and as strong obstacles to dislocation motion. Dislocations were observed to form pile-ups at GBs upon loading. Generally the basal slip system with the highest Schmid factor was found to be the most active, and dislocations were emitted from GB facets as semi-hexagonal loops in order to relieve the stress build-up from GB sliding. When the relative orientation of two adjacent grains and the orientation of the GB between them with respect to the loading direction discouraged GB sliding, thus suppressing dislocation nucleation at the GB, dislocations originating in one grain piled up at the GB and led to slip transmission through the GB The latter geometrical arrangement is rarely encountered, suggesting that slip transmission through grain boundaries in ice is a rare event. When basal slip was suppressed, i.e. when the loading direction lay in the basal plane, slip occurred by the glide of a fast edge segment on non-basal planes.</jats:p> Dynamic observations of dislocation/grain-boundary interactions in ice Annals of Glaciology |
| spellingShingle | Baker, I., Liu, F., Jia, K., Hu, X., Cullen, D., Dudley, M., Annals of Glaciology, Dynamic observations of dislocation/grain-boundary interactions in ice, Earth-Surface Processes |
| title | Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_full | Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_fullStr | Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_full_unstemmed | Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_short | Dynamic observations of dislocation/grain-boundary interactions in ice |
| title_sort | dynamic observations of dislocation/grain-boundary interactions in ice |
| title_unstemmed | Dynamic observations of dislocation/grain-boundary interactions in ice |
| topic | Earth-Surface Processes |
| url | http://dx.doi.org/10.3189/172756400781820525 |