Experimental investigation of grain boundary sliding in polycrystalline halite

Abstract eng:
Deformation mechanisms of synthetic halite are investigated at the scale of its polycrystalline microstructure. Both crystal slip plasticity, associated with several slip systems with contrasted critical resolved shear stresses, and grain boundary sliding are observed during in situ compression tests inside the chamber of a scanning electron microscope (SEM). Specific digital image correlation tools provide access to a quantification of the relative contribution of both mechanims to the overall strain of the sample and show that grain boundary sliding is present from the beginning of plasticity, establishing that plastic deformation of such a rock is not possible without simultaneous damage. These surface measurements are complemented with full 3D investigations based on computed X-rays absorption tomography and digital volume correlation, performed on samples that are also investigated in the SEM. Obtained data provide a way to compare the statistics of local fields in the bulk of samples and near free surfaces.

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