Mobility of dislocations in aluminum at 74° and 83°K

In a previous article(1) the authors reported determinations of the velocity of dislocations in high-purity single crystals of aluminum as a function of applied stress in the temperature range 123° to 343°K. These results were obtained using a stress-pulse technique in which dislocation positions were observed before and after the stress pulse using the Berg-Barrett x-ray technique. This note reports an extension of the dislocation velocity measurements in aluminum to lower temperatures, 74° and 83°K, and discusses their significance.