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Intragranular deformation mechanisms in calcite deformed by high-pressure torsion at room temperature

Published on Jan 7, 2020in Mineralogy and Petrology1.573
· DOI :10.1007/s00710-019-00690-y
Roman Schuster1
Estimated H-index: 1
(University of Vienna),
Gerlinde Habler13
Estimated H-index: 13
(University of Vienna)
+ 1 AuthorsRainer Abart20
Estimated H-index: 20
(University of Vienna)
Abstract
Polycrystalline calcite was deformed to high strain at room-temperature and confining pressures of 1–4 GPa using high-pressure torsion. The high confining pressure suppresses brittle failure and allows for shear strains >100. The post-deformation microstructures show inter- and intragranular cataclastic deformation and a high density of mechanical e\( \left\{01\overline{1}8\right\} \) twins and deformation lamellae in highly strained porphyroclasts. The morphologies of the twins resemble twin morphologies that are typically associated with substantially higher deformation temperatures. Porphyroclasts oriented unfavorably for twinning frequently exhibit two types of deformation lamellae with characteristic crystallographic orientation relationships associated with calcite twins. The misorientation of the first deformation lamella type with respect to the host corresponds to the combination of one r\( \left\{10\overline{1}4\right\} \) twin operation and one specific f\( \left\{01\overline{1}2\right\} \) or e\( \left\{01\overline{1}8\right\} \) twin operation. Boundary sections of this lamella type often split into two separated segments, where one segment corresponds to an incoherent r\( \left\{10\overline{1}4\right\} \) twin boundary and the other to an f\( \left\{01\overline{1}2\right\} \) or e\( \left\{01\overline{1}8\right\} \) twin boundary. The misorientation of the second type of deformation lamellae corresponds to the combination of specific r\( \left\{10\overline{1}4\right\} \) and f\( \left\{01\overline{1}2\right\} \) twin operations. The boundary segments of this lamella type may also split into the constituent twin boundaries. Our results show that brittle failure can effectively be suppressed during room-temperature deformation of calcite to high strains if confining pressures in the GPa range are applied. At these conditions, the combination of successive twin operations produces hitherto unknown deformation lamellae.
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References37
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#1Roman Schuster (University of Vienna)H-Index: 1
#2Gerlinde Habler (University of Vienna)H-Index: 13
Last. Rainer Abart (University of Vienna)H-Index: 20
view all 4 authors...
Abstract Calcite powder aggregates were deformed to shear strains up to 80 by high-pressure torsion at temperatures of 235 and 450 °C and confining pressures of 1–4 GPa. At 235 °C the deformation occurs by twinning and limited dislocation creep as well as by brittle processes. In contrast, subgrain rotation recrystallization is the predominant deformation mechanism at 450 °C. The high confining pressures affect the microstructural evolution by inhibiting crack nucleation and propagation and by c...
Source
#1Roman Schuster (University of Vienna)H-Index: 1
#2Erhard Schafler (University of Vienna)H-Index: 26
Last. Rainer Abart (University of Vienna)H-Index: 20
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Author(s): Schuster, R; Schafler, E; Schell, N; Kunz, M; Abart, R | Abstract: © 2017 Elsevier B.V. Calcite aggregates were deformed to high strain using high-pressure torsion and applying confining pressures of 1–6 GPa and temperatures between room temperature and 450 °C. The run products were characterized by X-ray diffraction, and key microstructural parameters were extracted employing X-ray line profile analysis. The dominant slip system was determined as r{101¯4}⟨2¯021⟩ with edge dislocation...
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#2Brian Evans (MIT: Massachusetts Institute of Technology)H-Index: 38
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