Abstract
Dynamic compression experiments are performed on single-crystal Si under split Hopkinson pressure bar loading, together with simultaneous high-speed (250-350 ns resolution) synchrotron X-ray Laue diffraction and phase-contrast imaging. A methodology is presented which determines crystal rotation parameters, i.e. instantaneous rotation axes and angles, from two unindexed Laue diffraction spots. Two-dimensional translation is obtained from dynamic imaging by a single camera. High-speed motion of crystals, including translation and rotation, can be tracked in real time via simultaneous imaging and diffraction.
Highlights
Grain or crystal rotation is a key mechanism of accommodating elastic or plastic deformation in crystalline solids (Chen et al, 2013)
In quasi-static experiments, crystal rotation is normally resolved with electron backscattering diffraction (Zaafarani et al, 2008) or X-ray Laue diffraction (Maaß et al, 2007, 2008)
Detection of highspeed particle rotation is in urgent need
Summary
Grain or crystal rotation is a key mechanism of accommodating elastic or plastic deformation in crystalline solids (Chen et al, 2013). Synchrotron X-ray Laue diffraction possesses unique advantages for lattice-level measurements under dynamic loading and has been under intensive development along with synchrotron X-ray imaging (Luo et al, 2012; Hudspeth et al, 2013; Lambert et al, 2014; Turneaure et al, 2009; Wei et al, 2004) for studying high-strain-rate deformation, fracture and phase change of a variety of materials. We choose single-crystal Si, brittle and of high modulus, for dynamic loading with a SHPB, and perform simultaneous X-ray imaging and Laue diffraction, in order to establish an illustrative case for quantitative rotation and translation measurements. High-speed motion of crystals, including two-dimensional translation and three-dimensional rotation, can be tracked in real time from simultaneous imaging and diffraction
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