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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