Subgrain Rotation Recrystallization During Shearing: Insights From Full‐Field Numerical Simulations of Halite Polycrystals

We present, for the first time, results of full‐field numerical simulations of subgrain rotation recrystallization of halite polycrystals during simple shear deformation. The series of simulations show how microstructures are controlled by the competition between (i) grain size reduction by creep by...

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Bibliographic Details
Published in:Journal of geophysical research. Solid earth 2017-11, Vol.122 (11), p.8810-8827
Main Authors: Gomez‐Rivas, E., Griera, A., Llorens, M.‐G., Bons, P. D., Lebensohn, R. A., Piazolo, S.
Format: Article
Language:English
Subjects:
Boundary maps
Coalescence
Coalescing
Coarsening
Computer simulation
Crystal lattices
Crystal structure
Crystallography
Deformation
Deformation mechanisms
Dislocation
Dislocations
Evolution
Geophysics
Grain boundaries
Grain size
Grain sub boundaries
Halite
Halites
intracrystalline recovery
Lattices (mathematics)
Mathematical models
Microstructure
misorientation
Modelling
Numerical simulations
Orientation
Particle size
Polycrystals
Recovery
Recrystallization
Rotation
Scaling
Shear deformation
Shearing
Simulation
Size reduction
Solifluction
strain gauge
Strain gauges
subgrain rotation recrystallization
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Summary:We present, for the first time, results of full‐field numerical simulations of subgrain rotation recrystallization of halite polycrystals during simple shear deformation. The series of simulations show how microstructures are controlled by the competition between (i) grain size reduction by creep by dislocation glide and (ii) intracrystalline recovery encompassing subgrain coarsening by coalescence through rotation and alignment of the lattices of neighboring subgrains. A strong grain size reduction develops in models without intracrystalline recovery, as a result of the formation of high‐angle grain boundaries when local misorientations exceed 15°. The activation of subgrain coarsening associated with recovery decreases the stored strain energy and results in grains with low intracrystalline heterogeneities. However, this type of recrystallization does not significantly modify crystal preferred orientations. Lattice orientation and grain boundary maps reveal that this full‐field modeling approach is able to successfully reproduce the evolution of dry halite microstructures from laboratory deformation experiments, thus opening new opportunities in this field of research. We demonstrate how the mean subgrain boundary misorientations can be used to estimate the strain accommodated by dislocation glide using a universal scaling exponent of about 2/3, as predicted by theoretical models. In addition, this strain gauge can be potentially applied to estimate the intensity of intracrystalline recovery, associated with temperature, using quantitative crystallographic analyses in areas with strain gradients. Key Points Full‐field numerical simulations of subgrain rotation recrystallization, able to reproduce experiments, are presented for the first time Intracrystalline recovery strongly decreases grain size reduction but does not change crystal preferred orientations Mean subgrain misorientations can be used as a strain gauge for polycrystals undergoing recrystallization, following a universal law
ISSN:2169-9313
2169-9356
DOI:10.1002/2017JB014508