J. Phys. III France
Volume 3, Numéro 2, February 1993
Page(s) 179 - 183
DOI: 10.1051/jp3:1993125
J. Phys. III France 3 (1993) 179-183

On impurity segregation on dislocations in metals

Yu. S. Netchaev1 and L. V. Mukhina2

1  Moscow Institute of Steel and Alloys, 4 Lenin avenue, Russia
2  Technical University, Karanganda Metallurgical Combine, Kazakhstan

(Received 14 September 1990, revised and accepted 15 October 1992)

Thermodynamic and crystallo-chemistry considerations are given about the possibility of existing linear distribution laws for some impurities in metals between bulk solution and near-dislocation segregation regions (NDSR) with composition and structure close to the corresponding intermetallic compound. The solutions of Fe in Al are considered. NDSR composition can be close to FeAl 3. The experimental data on the solubilities are treated within the model developed to determine the effective binding enthalpy which is close to the dissolution enthalpy of the FeAl 3 compound in Al. The effective distribution law differs from true adsorption forms. It is valid for limited concentration range and connected to the phase diagram change for the NDSR. The known diffusion anomalies for transition impurities in Al are satisfactory explained with using this distribution law.

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