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Using the results of reaction kinetics controlled by anisotropic diffusion, this paper shows that the difference between the diffusional anisotropies of the vacancies and interstitials produces different sink strengths for the two kinds of point defects. The effects on irradiation deformation are investigated in terms of a generalized bias concept that depends not only on the point-defect/sink interaction, as in conventional theories, but also on the diffusional anisotropy difference. It is found that anisotropic diffusion adds a new dimension to the theory of irradiation deformation, which needs to be taken into account in the study of the underlying mechanisms.
irradiation deformation, void swelling, irradiation creep, irradiation growth, anisotropic diffusion, noncubic metals, crowdions, stress effects, bias, reaction kinetics
Senior research officer and group leader, Material Science Branch, Atomic Energy of Canada Limited, Whiteshell Nuclear Research Establishment, Pinawa, Manitoba,