Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica
The shape and distribution of boundaries within and between grains have an influential effect onthe microstructure evolution of polycrystalline polar ice. Indeed, microstructural processes likepolygonization, grain growth and recrystallization are directly affected by the (sub-)grainboundary arrange...
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ftawi:oai:epic.awi.de:10672 2023-09-05T13:14:17+02:00 Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica Hamann, Ilka Kipfstuhl, Sepp Faria, S. H. Lambrecht, A. Grigoriev, D. Marino, F. 2004 application/pdf https://epic.awi.de/id/eprint/10672/ https://epic.awi.de/id/eprint/10672/1/Ham2004e.pdf https://hdl.handle.net/10013/epic.21141 https://hdl.handle.net/10013/epic.21141.d001 unknown https://epic.awi.de/id/eprint/10672/1/Ham2004e.pdf https://hdl.handle.net/10013/epic.21141.d001 Hamann, I. orcid:0000-0002-3023-6036 , Kipfstuhl, S. , Faria, S. H. , Lambrecht, A. , Grigoriev, D. and Marino, F. (2004) Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica , EGU 1st general assembly 25-30 April 2004 Nice France. . hdl:10013/epic.21141 EPIC3EGU 1st general assembly 25-30 April 2004 Nice France. Conference notRev 2004 ftawi 2023-08-22T19:48:50Z The shape and distribution of boundaries within and between grains have an influential effect onthe microstructure evolution of polycrystalline polar ice. Indeed, microstructural processes likepolygonization, grain growth and recrystallization are directly affected by the (sub-)grainboundary arrangement and hierarchy. To map the (sub-)grain boundaries in a thick section of icewe used a CCD video camera system and a computer controlled xy-stage attached to an opticalmicroscope. Samples from three different depths were detailled mapped in the field. Theboundaries were classified according to their shape, intensity and (in the case of sub-boundaries) inclination relative to the surrounding slip lines. An extensive pinning and/or bulgingof grain boundaries by inclusions and subgrain boundaries were identified, indicating thatboundary migration seems to depend strongly on the deformation and inclusion content, even atshallow depths. A surprisingly high amount of bent and polygonized slip lines were also found atshallow depths, evidencing that the intracrystalline deformation is highly inhomogeneous evenclose to the ice sheet surface. The origins of frequent subgrain loops are also discussed. Conference Object Antarc* Antarctica DML EPICA ice core Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The shape and distribution of boundaries within and between grains have an influential effect onthe microstructure evolution of polycrystalline polar ice. Indeed, microstructural processes likepolygonization, grain growth and recrystallization are directly affected by the (sub-)grainboundary arrangement and hierarchy. To map the (sub-)grain boundaries in a thick section of icewe used a CCD video camera system and a computer controlled xy-stage attached to an opticalmicroscope. Samples from three different depths were detailled mapped in the field. Theboundaries were classified according to their shape, intensity and (in the case of sub-boundaries) inclination relative to the surrounding slip lines. An extensive pinning and/or bulgingof grain boundaries by inclusions and subgrain boundaries were identified, indicating thatboundary migration seems to depend strongly on the deformation and inclusion content, even atshallow depths. A surprisingly high amount of bent and polygonized slip lines were also found atshallow depths, evidencing that the intracrystalline deformation is highly inhomogeneous evenclose to the ice sheet surface. The origins of frequent subgrain loops are also discussed. |
format |
Conference Object |
author |
Hamann, Ilka Kipfstuhl, Sepp Faria, S. H. Lambrecht, A. Grigoriev, D. Marino, F. |
spellingShingle |
Hamann, Ilka Kipfstuhl, Sepp Faria, S. H. Lambrecht, A. Grigoriev, D. Marino, F. Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica |
author_facet |
Hamann, Ilka Kipfstuhl, Sepp Faria, S. H. Lambrecht, A. Grigoriev, D. Marino, F. |
author_sort |
Hamann, Ilka |
title |
Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica |
title_short |
Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica |
title_full |
Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica |
title_fullStr |
Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica |
title_full_unstemmed |
Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica |
title_sort |
grain boundary hierarchy in the epica-dml deep ice core, antarctica |
publishDate |
2004 |
url |
https://epic.awi.de/id/eprint/10672/ https://epic.awi.de/id/eprint/10672/1/Ham2004e.pdf https://hdl.handle.net/10013/epic.21141 https://hdl.handle.net/10013/epic.21141.d001 |
genre |
Antarc* Antarctica DML EPICA ice core Ice Sheet |
genre_facet |
Antarc* Antarctica DML EPICA ice core Ice Sheet |
op_source |
EPIC3EGU 1st general assembly 25-30 April 2004 Nice France. |
op_relation |
https://epic.awi.de/id/eprint/10672/1/Ham2004e.pdf https://hdl.handle.net/10013/epic.21141.d001 Hamann, I. orcid:0000-0002-3023-6036 , Kipfstuhl, S. , Faria, S. H. , Lambrecht, A. , Grigoriev, D. and Marino, F. (2004) Grain boundary hierarchy in the EPICA-DML deep ice core, Antarctica , EGU 1st general assembly 25-30 April 2004 Nice France. . hdl:10013/epic.21141 |
_version_ |
1776205291231117312 |