FN Archimer Export Format
PT J
TI Uniaxial compression of calcite single crystals at room temperature: insights into twinning activation and development
BT 
AF PARLANGEAU, Camille
   DIMANOV, Alexandre
   LACOMBE, Olivier
   HALLAIS, Simon
   DANIEL, Jean-Marc
AS 1:1,2;2:1;3:2;4:1;5:3;
FF 1:;2:;3:;4:;5:PDG-REM;
C1 Ecole Polytech, Lab Mecan Solides, F-91128 Palaiseau, France.
   Sorbonne Univ, Inst Sci Terre Paris, CNRS INSU, ISTeP UMR 7193, F-75005 Paris, France.
   IFREMER, F-29280 Plouzane, France.
C2 ECOLE POLYTECH, FRANCE
   UNIV PARIS 06, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM
IN WOS Ifremer UPR
   DOAJ
   copubli-france
   copubli-univ-france
IF 2.921
TC 24
UR https://archimer.ifremer.fr/doc/00481/59236/61943.pdf
   https://archimer.ifremer.fr/doc/00481/59236/61945.pdf
   https://archimer.ifremer.fr/doc/00481/59236/61946.pdf
LA English
DT Article
AB E-twinning is a common plastic deformation mechanism in calcite deformed at low temperature. Strain rate, temperature and confining pressure have negligible effects on twinning activation which is mainly dependent on differential stress. The critical resolved shear stress (CRSS) required for twinning activation is dependent on grain size and strain hardening. This CRSS value may obey the Hall–Petch relation, but due to sparse experimental data its actual evolution with grain size and strain still remains a matter of debate. In order to provide additional constraints on twinning activation and development, new mechanical tests were carried out at room temperature on unconfined single crystals of calcite, with different sizes and crystallographic orientations. Uniaxial deformation was performed at a controlled displacement rate, while the sample surface was monitored using optical microscopy and a high-resolution CCD (charge-coupled device) camera. The retrieved macroscopic stress–strain behavior of the crystals was correlated with the surface observations of the deformation process. Results show (1) the onset of crystal plasticity with the activation of the first isolated mechanical twins during the strain hardening stage, and (2) the densification and thickening of twin lamellae during the steady-state flow stress stage. Such thickening of twin lamellae at room temperature emphasizes that calcite twin morphology is not controlled solely by temperature. The different values for the CRSS obtained for the activation of isolated twins and for the onset of twin densification and thickening raises questions regarding the appropriate value to be considered when using calcite twin data for stress inversion purposes. 
PY 2019
PD FEB
SO Solid Earth
SN 1869-9510
PU Copernicus Gesellschaft Mbh
VL 10
IS 1
UT 000458041000001
BP 307
EP 316
DI 10.5194/se-10-307-2019
ID 59236
ER

EF