A change in dislocation density during equal-channel angular pressing of Cu: experiment and simulation.

Nariman A. Enikeev ,  Igor V. Alexandrov 

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, K.Marks St.12, Ufa 450000, Russian Federation

Abstract

Samples of Cu processed by equal-channel angular pressing (ECAP) up to 12 passes were investigated by x-ray analysis. Dependencies of the x-ray dislocation density on the imposed strain were obtained. The dependencies were analysed in terms of dislocation model of deformation behaviour of f.c.c. metals at large strains. This approach was developed on the base of Estrin-Toth model [1], into which certain modification were introduced. The results of calculations are in reasonable agreement with experimental data. The suggested approach may assist in prediction of microstructure parameters evolution during severe plastic deformation.

[1] Y. Estrin, L.S. Toth, A. Molinari, Y. Brechet, A dislocation-based model for all hardening stages in large strain deformation. - Acta mater (1998) v.46, No. 15, pp. 5509-5522.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium I, by Nariman A. Enikeev
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-14 09:01
Revised:   2009-06-07 00:44
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