Study of the dislocation relaxation peaks in easy glide deformed silver single crystals having different length-to-width ratios

Abstract

The dislocation relaxation peaks in a deformed silver single crystal of orientation (110), i.e. easy glide, with length-to-width ratios of 8:1, 6.5:1, 4.9:1, 4:1 and 1:1 have been studied. These relaxation peaks have been measured at frequencies of 5, 10 and 30 MHz. The results showed that a crystal with the ratio 8:1 produced the highest dislocation relaxation peaks at higher temperature. As the ratio decreased, the peak height decreased nearly linearly when the measurements were carried out at 5 MHz. At frequencies of 10 and 30 MHz, the peak height fell dramatically, especially for ratios less than 8:1. The large dislocation relaxation peak height which occurred at higher temperature in the sample of ratio 8:1 was attributed to long dislocation loops formed during deformation. These loops seem to become shorter as the length-to-width ratio decreases.