Strain Energy of a Kink

Abstract

The strain energy of a kink in a dislocation is calculated using a newly developed approach to problems involving stationary dislocations. The method is based upon linear elasticity theory supplemented by the use of a Debye cutoff in momentum space, the latter being introduced to account for the finite number of degrees of freedom of real solids. Numerical results are given for Al, the noble metals, and for Nb. These are compared with the experimentally determined activation energies associated with the Bordoni internal friction peaks. The calculated values for kinks in screw dislocations, in the metals considered, are found to exceed the experimental values by not more than 66%.