Internal friction in f. c. c. alloys due to solute drag on dislocations; 1: A model for the effect of core diffusion

Journal Article · Tue Nov 01 04:00:00 EST 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90444-8· OSTI ID:7184987

Pichler, A; Arzt, E ^[1]

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1. Max-Planck-Inst. fuer Metallforschung, Stuttgart (Germany) Univ. Stuttgart (Germany). Inst. fuer Metallkunde

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][sub xy], the solute concentration c[sub 0], the pinning length of the dislocation and the temperature. It is shown that, at low c[sub 0] and high [sigma][sub xy], the kinetics of the dislocation motion is determined by the fast diffusion of the solute atoms in the core, while for high c[sub 0] and low [sigma][sub xy] the diffusion of the atoms far away from the dislocation is rate-limiting. The results are compared with the analytical model of Schoeck and are applied to the alloy system Al-Si. New experimental results supporting the model are described in a companion paper (Part 2).

• OSTI ID: 7184987
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:11; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360104 -- Metals & Alloys-- Physical Properties
ALLOYS
ALUMINIUM ALLOYS
COMPARATIVE EVALUATIONS
CRYSTAL DEFECTS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DISLOCATIONS
EVALUATION
FCC LATTICES
FRICTION
INTERNAL FRICTION
LINE DEFECTS
MATHEMATICAL MODELS
SILICON ALLOYS