Decoupling between strain localisation and the microstructural record revealed by in-situ strain measurements in polycrystalline ice
نویسندگان
چکیده
We explore the links between strain localisation and microstructural evolution in ice Ih deformed by dislocation creep. Using digital image correlation (DIC), we monitored of field two coarse-grained columnar samples creep (uniaxial compression at constant load) −7 °C 0.5 MPa up to 9.5% bulk shortening. After a brief transient (<0.2% strain), which localises nearby grain boundaries, viscoplastic concentrates few narrow intracrystalline shear bands that eventually extend over multiple grains. A comparison pre- post-deformation crystal orientation maps shows is mainly accommodated basal slip without producing significant dislocation-related substructures. Severe dynamic recrystallisation develops locally boundaries act as barriers motion, particularly where transfer ineffective. These observations are compared full-field simulations reproducing initial microstructure experimental setup, predict stress rate fields for deformation entirely on known systems ice. The present data indicate during high homologous temperatures: (1) does not drive but accommodates incompatibility, (2) large strains can be unimpeded with no formation Observation implies intragranular gradients unreliable gauges intensity scale proportion types subgrains measure relative contribution different deformation. Finally, discuss implications this study interpretation modelling rocks.
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ژورنال
عنوان ژورنال: Earth and Planetary Science Letters
سال: 2023
ISSN: ['1385-013X', '0012-821X']
DOI: https://doi.org/10.1016/j.epsl.2023.118149