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© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 Aug 2018

Research article | 27 Aug 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Uniaxial compression of calcite single crystals at room temperature: insights into twinning activation and development

Camille Parlangeau1, Alexandre Dimanov1, Olivier Lacombe2, Simon Hallais1, and Jean-Marc Daniel3 Camille Parlangeau et al.
  • 1Laboratoire de Mécanique des Solides (LMS), Ecole Polytechnique, Palaiseau, 91128, France
  • 2Institut des Sciences de la Terre de Paris (ISTeP), Sorbonne Université, Paris, 75005, France
  • 3Ifremer, Plouzané, 29280, France

Abstract. 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 that 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 controlled displacement rate, meanwhile the sample surface was monitored using optical microscopy and high resolution CCD 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 only controlled by temperature. The different values for the CRSS obtained for the activation of isolated twins and for the onset of twin densification and thickening questions the appropriate value to be considered when using calcite twin data for stress inversion purposes.

Camille Parlangeau et al.
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Camille Parlangeau et al.
Camille Parlangeau et al.
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Short summary
The calcite twinning is a common deformation mechanism mainly occuring at low temperatures. Twinning activation appears at a critical strength value, poorly documented and still debated. The temperature is known to influence the twin thickness and shape. However, only few studies have been conducted calcite deformation at low temperatures. The goal of this study is to determine if the thickness is mainly due to the high temperatures and the realness of a threshold value for tinning activation.
The calcite twinning is a common deformation mechanism mainly occuring at low temperatures....