In-Situ Synchrotron X-Ray Topographic Studies Of Polycrystalline Ice.

This paper provides an overview of recent in-situ synchrotron x-ray topography experiments on the deformation of polycrystalline ice. It has been shown that deformation is initiated by the nucleation of semi-hexagonal basal dislocation loops at grain boundary facets. The dislocations subsequently gl...

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Bibliographic Details
Other Authors: THAYER SCHOOL OF ENGINEERING HANOVER NH
Format: Text
Language:English
Published: 1994
Subjects:
Snow
Ice and Permafrost
Nuclear Physics & Elementary Particle Physics
*X RAYS
*ICE
*SYNCHROTRON RADIATION
REPRINTS
SYMPOSIA
DEFORMATION
NUCLEATION
TOPOGRAPHY
SHEAR STRESSES
GRAIN BOUNDARIES
POLYCRYSTALLINE
X RAY FILM
Ice
permafrost
Online Access:http://www.dtic.mil/docs/citations/ADA291877
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA291877
Description
Summary:This paper provides an overview of recent in-situ synchrotron x-ray topography experiments on the deformation of polycrystalline ice. It has been shown that deformation is initiated by the nucleation of semi-hexagonal basal dislocation loops at grain boundary facets. The dislocations subsequently glide across the grain. The slip system which operates was found to be the one with the highest resolved shear stress. Non-basal slip was also observed but only becomes significant if basal slip is inhibited. Whilst slip propagation between grains has been observed (once) it appears to occur only for special orientation relationships between grains. (MM)

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