Microstructure evolution in the equal channel angular extrusion process
We apply a theory of single-crystal plasticity with microstructure to the simulation of the ECAE process. The specific microstructures considered in the simulations are of the sequential lamination type. The size of the microstructure is estimated a posteriori by means of a nonlocal extension of the theory which accounts for dislocation energies. Texture evolution is calculated simply by recourse to Taylor's hypothesis. Calculations concerned with an FCC material (Al–Cu alloy) and 90° ECAE reveal a wealth of information regarding the geometry, size, and texture evolution of subgrain microstructures. The predicted sizes and textures are in good quantitative agreement with the available experimental data.
© 2004 Elsevier. Received 24 October 2003, Revised 23 January 2004, Accepted 23 January 2004, Available online 2 September 2004. The authors gratefully acknowledge the support of the Department of Energy through Caltech's ASCI ASAP Center for Simulating Dynamic Response of Materials. We are grateful to Dr. Carlos Tomé and Dr. Irene Beyerlein for many useful discussions, for making the POLE program available to us, and for making unpublished work available to us. We gratefully acknowledge Mr. Matt Fago for providing a program for plotting sequential laminates.