A new model was suggested, for a rapidly operating dislocation source, which was based upon the multiplication and motion of partial dislocations that bounded stacking faults. The stress-activated stretching of the lateral branches of partial dislocation bowed-out segments resulted in the collapse of these branches, with subsequent restoration of the initial dislocation half-loops and the generation of a fresh partial dislocation loop; both of which were capable of leading to the next multiplication. This multiplication resulted in an exponential increase in both the dislocation and stacking fault concentrations, and was associated with plastic deformation at a strain rate whose characteristic time ranged from 10-9 to 10-10s. This model explained the variations in the X-ray diffraction patterns of material which underwent shock compression, the shock-induced formation of twins, and shear band and pre-fracture void nucleation in the rarefaction wave.

Dislocation Multiplication behind the Shock Front. E.Zaretsky: Journal of Applied Physics, 1995, 78[6], 3740-7