X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice.
The interaction of dislocations with grain boundaries in polycrystalline ice have been studied using in situ deformation sychrotron x-ray topography. Specimen preparation was performed in the Ice Research Laboratory at Dartmouth College, and x-ray topography was performed at the National Sychrotron...
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ftdtic:ADA318455 2023-05-15T16:37:24+02:00 X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. Baker, Ian THAYER SCHOOL OF ENGINEERING HANOVER NH 1996-10-18 text/html http://www.dtic.mil/docs/citations/ADA318455 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA318455 en eng http://www.dtic.mil/docs/citations/ADA318455 APPROVED FOR PUBLIC RELEASE DTIC AND NTIS Snow Ice and Permafrost Crystallography *CRYSTAL STRUCTURE *ICE FORMATION DEFORMATION SINGLE CRYSTALS X RAYS TOPOGRAPHY DISLOCATIONS SHEAR STRESSES GRAIN BOUNDARIES POLYCRYSTALLINE X TAY TOPOGRAPHY SYNCHROTRON X RAYS BASAL SLIP Text 1996 ftdtic 2016-02-19T19:16:41Z The interaction of dislocations with grain boundaries in polycrystalline ice have been studied using in situ deformation sychrotron x-ray topography. Specimen preparation was performed in the Ice Research Laboratory at Dartmouth College, and x-ray topography was performed at the National Sychrotron Light Source at Brookhaven National Laboratory, in collaboration with Prof. M. Dudley (SUNY at Stony Brook) and Dr. D. Black (NIST). We have demonstrated that x-radiation can be used to study ice without affecting the dislocations present. The main part of the work has demonstrated that normally basal dislocations are emitted from grain boundary facets during grain boundary sliding. However, in situations where basal slip is suppressed, by having no resolved shear stresses on the basal plane, non-basal slip occurs. Normally, dislocations are emitted into both adjacent grains from a grain boundary facet, glide across the grain and pile-up at the opposite boundary. However, it has been demonstrated that these pile-ups can lead to slip transmission for certain geometrical arrangements of the basal planes, on either side of the grain boundary. The project also briefly explored dislocation behavior ahead of loaded notches in single crystals, and the effect of high concentrations of HCl on the velocity of dislocations. Text Ice permafrost Defense Technical Information Center: DTIC Technical Reports database Tay ENVELOPE(-55.750,-55.750,-63.367,-63.367) |
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Open Polar |
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Defense Technical Information Center: DTIC Technical Reports database |
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ftdtic |
language |
English |
topic |
Snow Ice and Permafrost Crystallography *CRYSTAL STRUCTURE *ICE FORMATION DEFORMATION SINGLE CRYSTALS X RAYS TOPOGRAPHY DISLOCATIONS SHEAR STRESSES GRAIN BOUNDARIES POLYCRYSTALLINE X TAY TOPOGRAPHY SYNCHROTRON X RAYS BASAL SLIP |
spellingShingle |
Snow Ice and Permafrost Crystallography *CRYSTAL STRUCTURE *ICE FORMATION DEFORMATION SINGLE CRYSTALS X RAYS TOPOGRAPHY DISLOCATIONS SHEAR STRESSES GRAIN BOUNDARIES POLYCRYSTALLINE X TAY TOPOGRAPHY SYNCHROTRON X RAYS BASAL SLIP Baker, Ian X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. |
topic_facet |
Snow Ice and Permafrost Crystallography *CRYSTAL STRUCTURE *ICE FORMATION DEFORMATION SINGLE CRYSTALS X RAYS TOPOGRAPHY DISLOCATIONS SHEAR STRESSES GRAIN BOUNDARIES POLYCRYSTALLINE X TAY TOPOGRAPHY SYNCHROTRON X RAYS BASAL SLIP |
description |
The interaction of dislocations with grain boundaries in polycrystalline ice have been studied using in situ deformation sychrotron x-ray topography. Specimen preparation was performed in the Ice Research Laboratory at Dartmouth College, and x-ray topography was performed at the National Sychrotron Light Source at Brookhaven National Laboratory, in collaboration with Prof. M. Dudley (SUNY at Stony Brook) and Dr. D. Black (NIST). We have demonstrated that x-radiation can be used to study ice without affecting the dislocations present. The main part of the work has demonstrated that normally basal dislocations are emitted from grain boundary facets during grain boundary sliding. However, in situations where basal slip is suppressed, by having no resolved shear stresses on the basal plane, non-basal slip occurs. Normally, dislocations are emitted into both adjacent grains from a grain boundary facet, glide across the grain and pile-up at the opposite boundary. However, it has been demonstrated that these pile-ups can lead to slip transmission for certain geometrical arrangements of the basal planes, on either side of the grain boundary. The project also briefly explored dislocation behavior ahead of loaded notches in single crystals, and the effect of high concentrations of HCl on the velocity of dislocations. |
author2 |
THAYER SCHOOL OF ENGINEERING HANOVER NH |
format |
Text |
author |
Baker, Ian |
author_facet |
Baker, Ian |
author_sort |
Baker, Ian |
title |
X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. |
title_short |
X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. |
title_full |
X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. |
title_fullStr |
X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. |
title_full_unstemmed |
X-Ray Topographic Studies of Dis1ocation/Grain Boundary Interactions in Ice. |
title_sort |
x-ray topographic studies of dis1ocation/grain boundary interactions in ice. |
publishDate |
1996 |
url |
http://www.dtic.mil/docs/citations/ADA318455 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA318455 |
long_lat |
ENVELOPE(-55.750,-55.750,-63.367,-63.367) |
geographic |
Tay |
geographic_facet |
Tay |
genre |
Ice permafrost |
genre_facet |
Ice permafrost |
op_source |
DTIC AND NTIS |
op_relation |
http://www.dtic.mil/docs/citations/ADA318455 |
op_rights |
APPROVED FOR PUBLIC RELEASE |
_version_ |
1766027692834029568 |