Relation between the activation parameters of low-temperature slip and the mean-square amplitude of atomic vibrations in cubic metals

Abstract

The available data on various activation parameters of low-temperature slip in 9 body-centred cubic and 5 face-centred cubic elements have been examined as a function of a single microscopic parameter, namely mean-square amplitude of atomic vibrations <u ²>, specific to the material. It is found that for a given crystal structure, the microscopic parameters of the unit activation process of yielding, e.g. the initial length of dislocation segment, the critical height of the kink-pair nucleated, the associated activation volume, the binding energy per interatomic spacing along the glide dislocation on the slip plane etc. correlate well with the mean-square amplitude of atomic vibrations <u ²> through a power regression formula.