Thermally-activated glide in magnesium crystals from 4·2° to 420°k

The effect of changes in strain rate ad temperature on the flow stress of Mg single crystals VIM determined m the range of 4·2° to 420°k. The present data, along with those obtained previously, indicate that the intersection of dislocations is the controlling mechanism. Cottrell's original model must, however, be modified to include an effect of stress on the activation volume. This effect appears to be due primarily to the fact that the force between two intersecting dislocations varies with their distance of separation rather than a change in the effective forest spacing.