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Effect of strain rate cycling on microstructures and crystallographic preferred orientation during high-temperature creep

Journal article
Authors Mark Peternell
Christopher J.L. Wilson
Published in Geology
Volume 44
Pages 279-282
ISSN 0091-7613
Publication year 2016
Published at
Pages 279-282
Language en
Links https://pubs.geoscienceworld.org/gs...
Subject categories Geology, Climate Research, Other Earth and Related Environmental Sciences, Earth and Related Environmental Sciences

Abstract

© 2016 Geological Society of America. Strain rate histories and strain magnitude are two crucial factors governing the evolution of dynamic recrystallized grain size and crystallographic preferred orientation (CPO) in rocks and ice masses. To understand the effect of cyclic variations in strain rate or non-steadystate deformation, we conducted two-dimensional, coaxial plane strain experiments with time-lapse observations from a fabric analyzer. There is a continuous reequilibration of microstructure and CPO development associated with constant and oscillating strain rate cycles. These can be correlated with c-axis small circle distributions, diagnostic of dynamic recrystallization involving new grain nucleation and grain boundary migration (GBM) as observed in the high-temperature deformation of ice and quartz. Inhomogeneous stress distribution can lead to grain size reduction for relatively slower strain rates and GBM for relatively faster rates within a long-interval cycling event, a behavior that contradicts the classic view for dynamic recrystallization processes. Where there is a rapid short-term cycling of strain rate, GBM is hampered and nucleation dominates, accompanied by a marked reduction of grain size and no new CPO development. During such short-term cycling, GBM and crystallographic change is impeded not by impurities, but by an inability of newly nucleated grains to grow.

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