Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures
Synthetic polycrystalline ice was sheared at temperatures of −5, −20 and −30 ∘C, to different shear strains, up to γ=2.6, equivalent to a maximum stretch of 2.94 (final line length is 2.94 times the original length). Cryo-electron backscatter diffraction (EBSD) analysis shows that basal intracrystal...
Published in: | The Cryosphere |
---|---|
Main Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Copernicus Publications
2019
|
Subjects: | |
Online Access: | https://doi.org/10.5194/tc-13-351-2019 https://noa.gwlb.de/receive/cop_mods_00003285 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003243/tc-13-351-2019.pdf https://tc.copernicus.org/articles/13/351/2019/tc-13-351-2019.pdf |
id |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00003285 |
---|---|
record_format |
openpolar |
spelling |
ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00003285 2023-05-15T18:32:33+02:00 Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures Qi, Chao Prior, David J. Craw, Lisa Fan, Sheng Llorens, Maria-Gema Griera, Albert Negrini, Marianne Bons, Paul D. Goldsby, David L. 2019-02 electronic https://doi.org/10.5194/tc-13-351-2019 https://noa.gwlb.de/receive/cop_mods_00003285 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003243/tc-13-351-2019.pdf https://tc.copernicus.org/articles/13/351/2019/tc-13-351-2019.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-351-2019 https://noa.gwlb.de/receive/cop_mods_00003285 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003243/tc-13-351-2019.pdf https://tc.copernicus.org/articles/13/351/2019/tc-13-351-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/tc-13-351-2019 2022-02-08T23:00:39Z Synthetic polycrystalline ice was sheared at temperatures of −5, −20 and −30 ∘C, to different shear strains, up to γ=2.6, equivalent to a maximum stretch of 2.94 (final line length is 2.94 times the original length). Cryo-electron backscatter diffraction (EBSD) analysis shows that basal intracrystalline slip planes become preferentially oriented parallel to the shear plane in all experiments, with a primary cluster of crystal c axes (the c axis is perpendicular to the basal plane) perpendicular to the shear plane. In all except the two highest-strain experiments at −30 ∘C, a secondary cluster of c axes is observed, at an angle to the primary cluster. With increasing strain, the primary c-axis cluster strengthens. With increasing temperature, both clusters strengthen. In the −5 ∘C experiments, the angle between the two clusters reduces with strain. The c-axis clusters are elongated perpendicular to the shear direction. This elongation increases with increasing shear strain and with decreasing temperature. Highly curved grain boundaries are more prevalent in samples sheared at higher temperatures. At each temperature, the proportion of curved boundaries decreases with increasing shear strain. Subgrains are observed in all samples. Microstructural interpretations and comparisons of the data from experimentally sheared samples with numerical models suggest that the observed crystallographic orientation patterns result from a balance of the rates of lattice rotation (during dislocation creep) and growth of grains by strain-induced grain boundary migration (GBM). GBM is faster at higher temperatures and becomes less important as shear strain increases. These observations and interpretations provide a hypothesis to be tested in further experiments and using numerical models, with the ultimate goal of aiding the interpretation of crystallographic preferred orientations in naturally deformed ice. Article in Journal/Newspaper The Cryosphere Niedersächsisches Online-Archiv NOA The Cryosphere 13 1 351 371 |
institution |
Open Polar |
collection |
Niedersächsisches Online-Archiv NOA |
op_collection_id |
ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
spellingShingle |
article Verlagsveröffentlichung Qi, Chao Prior, David J. Craw, Lisa Fan, Sheng Llorens, Maria-Gema Griera, Albert Negrini, Marianne Bons, Paul D. Goldsby, David L. Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
topic_facet |
article Verlagsveröffentlichung |
description |
Synthetic polycrystalline ice was sheared at temperatures of −5, −20 and −30 ∘C, to different shear strains, up to γ=2.6, equivalent to a maximum stretch of 2.94 (final line length is 2.94 times the original length). Cryo-electron backscatter diffraction (EBSD) analysis shows that basal intracrystalline slip planes become preferentially oriented parallel to the shear plane in all experiments, with a primary cluster of crystal c axes (the c axis is perpendicular to the basal plane) perpendicular to the shear plane. In all except the two highest-strain experiments at −30 ∘C, a secondary cluster of c axes is observed, at an angle to the primary cluster. With increasing strain, the primary c-axis cluster strengthens. With increasing temperature, both clusters strengthen. In the −5 ∘C experiments, the angle between the two clusters reduces with strain. The c-axis clusters are elongated perpendicular to the shear direction. This elongation increases with increasing shear strain and with decreasing temperature. Highly curved grain boundaries are more prevalent in samples sheared at higher temperatures. At each temperature, the proportion of curved boundaries decreases with increasing shear strain. Subgrains are observed in all samples. Microstructural interpretations and comparisons of the data from experimentally sheared samples with numerical models suggest that the observed crystallographic orientation patterns result from a balance of the rates of lattice rotation (during dislocation creep) and growth of grains by strain-induced grain boundary migration (GBM). GBM is faster at higher temperatures and becomes less important as shear strain increases. These observations and interpretations provide a hypothesis to be tested in further experiments and using numerical models, with the ultimate goal of aiding the interpretation of crystallographic preferred orientations in naturally deformed ice. |
format |
Article in Journal/Newspaper |
author |
Qi, Chao Prior, David J. Craw, Lisa Fan, Sheng Llorens, Maria-Gema Griera, Albert Negrini, Marianne Bons, Paul D. Goldsby, David L. |
author_facet |
Qi, Chao Prior, David J. Craw, Lisa Fan, Sheng Llorens, Maria-Gema Griera, Albert Negrini, Marianne Bons, Paul D. Goldsby, David L. |
author_sort |
Qi, Chao |
title |
Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
title_short |
Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
title_full |
Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
title_fullStr |
Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
title_full_unstemmed |
Crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
title_sort |
crystallographic preferred orientations of ice deformed in direct-shear experiments at low temperatures |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/tc-13-351-2019 https://noa.gwlb.de/receive/cop_mods_00003285 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003243/tc-13-351-2019.pdf https://tc.copernicus.org/articles/13/351/2019/tc-13-351-2019.pdf |
genre |
The Cryosphere |
genre_facet |
The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-13-351-2019 https://noa.gwlb.de/receive/cop_mods_00003285 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00003243/tc-13-351-2019.pdf https://tc.copernicus.org/articles/13/351/2019/tc-13-351-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/tc-13-351-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
1 |
container_start_page |
351 |
op_container_end_page |
371 |
_version_ |
1766216722611699712 |