Plasticity effects in dynamically loaded nickel aluminide bicrystals

摘要: Abstract This work is concerned with achieving an improved understanding of the role material strength effects during interactions shock waves grain boundaries. To this end, experiments have been performed using nanosecond laser shocks nickel aluminide bicrystals at tens GPa. Velocity histories were measured along a line on free surface and used to characterize behavior. Unstable plastic flow in 〈 1 0 〉 grains was seen occur when loaded above 700 m s−1 velocity. Observations boundary region showed that smooth transition occurred between elastic precursors both as well (when evident). Futhermore, length zone across observed be larger than projection boundary, indicating refraction incident wave resulted initiation transmitted reflected waves. A model developed explain experimentally The describes scattering elastic–plastic off boundaries crystalline materials where slip active deformation mechanism. Reflected release large angles (i.e. 56° for wave) from are predicted case propagating impacting 45° inclined which appears consistent experimental VISAR records. could not treated since polarization vector either parallel or perpendicular operative vectors NiAl.