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Mechanics and microstructure of deformed natural anisotropic ice

Cited 1 time in wos
Cited 2 time in scopus
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Title
Mechanics and microstructure of deformed natural anisotropic ice
Other Titles
변형된 자연산 이등방 얼음의 변형기작 및 미구조
Authors
Lisa Craw
Chao Qi
David Prior
David Goldsby
Kim, Daeyeong
Keywords
Crystallographic preferred orientations; Glaciology; Grain boundary sliding; Ice deformation; Ice microstructure
Issue Date
2018
Citation
Lisa Craw, et al. 2018. "Mechanics and microstructure of deformed natural anisotropic ice". JOURNAL OF STRUCTURAL GEOLOGY, 115(1): 152-166.
Abstract
We deformed coarse-grained (∼10 mm) natural ice in axial compression at ?30 °C, to an axial strain of 0.2, at three different angles to the existing strong crystallographic preferred orientation (CPO). We used three strain rates for each sample orientation. Cryo-electron backscatter diffraction (EBSD) maps show that after deformation there is a mixture of large (∼1?2 mm) relict grains, and finer (100?200 μm) recrystallised grains. The fine grains form a connected network in all samples. The large grains define a very strong CPO with equivalent but weaker CPOs in the recrystallised grains. The final CPO changed completely from its original orientation. Lattice distortion and subgrains equivalent in size to recrystallised grains suggest a subgrain rotation recrystallisation process has generated the recrystallised fraction. We suggest that strain rates were higher in the connected network of recrystallised grains because of a significant component of grain boundary sliding (GBS) that enables large grains to rotate by a combination of glide on the basal plane and rigid rotation, to define a very strong CPO. GBS weakens the CPO in the finer grained regions. The patterns of mechanical behaviour and the resultant microstructures do not bear an obvious relationship to original CPO.
URI
http://repository.kopri.re.kr/handle/201206/9898
DOI
http://dx.doi.org/10.1016/j.jsg.2018.07.014
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