Point defect-dislocation interaction in a crystal under tension

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Abstract
The influence of an external uniaxial stress on the interaction between mobile defects and individual network dislocations is studied theoretically. The point defects are described within the lattice Green function formalism. Their interaction energy with a source of internal stress is deduced. This energy is calculated between intrinsic point defects and a dislocation in a strained f.c.c. crystal. The work aims at examining the foundations of the irradiation creep theory that explains the phenomena as a preferential drift of interstitials and vacancies to dislocations with particular orientations to the external stress axis. The drift to edge dislocations is discussed using an expression that includes the discrete character of the jump. It is concluded that the proposed model of irradiation creep can be sustained only if the dipole tensors of the defects at the equilibrium and saddle point configurations fulfill some specific relations.