title: Inception and movement of a 'subgrain boundary precursor' in ice under an applied stress, observed by X-ray synchrotron radiation Bragg imaging.
abstract: Basal slip of dislocations, the easiest deformation mechanism of ice crystals, does not allow a response to any strain state. The first steps of another mechanism, with a moving subgrain boundary precursor region, which permits accommodating the effect of an applied load, is investigated on an ice single crystal, mainly using synchrotron radiation Bragg diffraction imaging. During this process, the evolution of the local integrated intensity shows that there is both a general multiplication of dislocations within the crystal and a movement of basal dislocations towards the surface. The 'subgrain boundary precursor' region evolves towards a classical grain boundary when further deformed.
authors.affiliation: Université Grenoble Alpes, LGGE, CNRS, BP 96, Grenoble 38041, France.
authors.forename: A
authors.initials: A
authors.lastname: Philip
authors.affiliation: Université Grenoble Alpes, LGGE, CNRS, BP 96, Grenoble 38041, France.
authors.forename: L
authors.initials: L
authors.lastname: Capolo
authors.affiliation: Université Grenoble Alpes, LGGE, CNRS, BP 96, Grenoble 38041, France.
authors.forename: J
authors.initials: J
authors.lastname: Meyssonnier
authors.affiliation: European Synchrotron Radiation Facility, BP 220, Grenoble 38043, France.
authors.forename: J
authors.initials: J
authors.lastname: Baruchel
keywords: deformation mechanism; dislocations; ice; single-crystal Bragg diffraction