X-RAY DIFFUSE-SCATTERING OF QUENCHED COPPER SINGLE-CRYSTALS

X-ray diffuse scattering was measured for quenched copper. The diffuse scattering near the (111) and (222) reflections was observed at room temperature for as quenched and successively annealed samples from 200 to 800 degrees C. A sharp and strong subpeak accompanied by a thermal diffuse scattering was appeared on a smaller angle side of the (111) Bragg angle. The subpeak was disappeared after annealing at 400 degree s C. A characteristic feature of this scattering is from vacancy type dislocation loops, of which the mean radius is estimated to be about 1 nm, associated with a caustic scattering.