Please use this identifier to cite or link to this item: doi:10.22028/D291-23807
Title: Internal friction in F.C.C. alloys due to solute drag on dislocations. - I. : A model for the effect of core diffusion
Author(s): Pichler, A.
Arzt, Eduard
Language: English
Year of Publication: 1994
OPUS Source: Acta metallurgica et materialia. - 42. 1994, 11, S. 3785-3800
SWD key words: Legierung
Mechanische Eigenschaft
DDC notations: 620 Engineering and machine engineering
Publikation type: Journal Article
Abstract: The internal friction (mechanical loss) behavior of dislocations is studied in a model which, for the first time, considers the substitutional solute mobility in the dislocation core to be higher than in the bulk around it. The parameters investigated include the external stress sigma xy, the solute concentration c0, the pinning length of the dislocation and the temperature. It is shown that, at low c0 and high sigma xy, the kinetics of the dislocation motion is determined by the fast diffusion of the solute atoms in the core, while for high c0 and low sigma xy, the diffusion of the atoms far away from the dislocation is rate-limiting. The results are compared with the analytica model of Schoeck and are applied to the alloy system Al-Si. New experimental results supporting the model are described in a companion paper (Paper II).
Link to this record: urn:nbn:de:bsz:291-scidok-17482
Date of registration: 14-Nov-2008
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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