Dedicated to Prof. Dr. A. SEEGEB on the occasion of his 60th birthdayThe diffusion equations for vacancies and interstitials in the field of straight edge dislocations are numerically solved for a crystal under irradiation and uniaxially stress. The main dislocation systems in hexagonal closed packed metals are considered. The diffusion model takes into account the full lattice and defect symmetry in the equilibrium and migration configurations. A diffusivity tensor for strained h a p . metals is deduced, which depends linearly on the strain field. This tensor allows to solve analytically the steady state defect flux towards a hollow cylinder in a homogeneously strained crystal. The resulting vacancy and interstitial absorption (sink strength) are calculated and compared with the ones obtained numerically when the dislocation field is taken into account. It is shown that both approaches result in a similar dependence of the sink strengths on the homogeneous strain as far as a correct capture radius is adopted for the hollow cylinder. The dependence of the results on the boundary conditions and the defect symmetry considered is discussed. For the numerical calculations defect symmetries consistent with those calculated for magnesium are used.Die Diffusionsgleichungen fur Leerstellen und Zwischengitteratomen im Feld von geraden Stufenversetzungen werden numerisch fur einen Kristall unter Bestrahlung und fur uniaxiale Spannung gelost. Die Hauptversetzungssysteme in hexagonal dichtest gepackten Metallen werden betrachtet. Das Diffusionsmodell beriicksichtigt die vollstandige Gitter-und Defektsymmetrie in den Gleichgewichts und den Bewegungskonfigurationen. Ein Diffusionstensor fur verzerrte h.d.p.-Metalle wird abgeleitet, der linear von dem Verzerrungsfeld abhangt. Dieser Tensor gestattet, den stationiiren StorstellenfluB zu einem Hohlzylinder in einem homogen verzerrten Kristall analytisch zu berechnen. Die resultierende Leerstellen-und Zwischengitteratom absorption (Senkenstiirke) werden berechnet und mit denen verglichen, die numerisch unter Beriicksichtigung des Versetzungsfeldes erhalten werden. Es wird gezeigt, daB beide Verfahren zu einer Lhnlichen Abhiingigkeit der Senkenstarke von der homogenen Verzerrung fuhren, falls korrekte Einfangradien fur den Hohlzylinder angenommen werden. Die Abhiingigkeit der Ergebnisse von den Randbedingungen und der betrachteten Defektsymmetrie wird diskutiert. Fur die numerisohen Berechnungen werden Defektsymmetrien benutzt, die konsistent mit den fur Magnesium berechneten sind.
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