Table of Contents
Textures and Microstructures
Volume 31, Issue 4, Pages 217-230
http://dx.doi.org/10.1155/TSM.31.217

The Rules for the Lattice Rotation Accompanying Slip as Derived From a Self-Consistent Model

1lFIR (UNR-CONICET), 27de Febrero 210 Bis, Rosario 2000, Argentina
2Materials Research Department, Risø National Laboratory, P.O. Box 49, Roskilde DK-4000, Denmark

Received 29 July 1998; Accepted 12 November 1998

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The rules for the lattice rotation during rolling (plane strain) deformation of fcc polycrystals are studied with a viscoplastic self-consistent model. Very high values of the ratesensitivity exponent are used in order to establish Sachs-type conditions with large local deviations from the macroscopic strain. The lattice rotation depends on the grain shape. For equiaxed grains the lattice rotation follows the MA rule, which is the one normally used in solid mechanics. For elongated and flat grains the lattice rotation follows a different rule, the PSA rule. In the standard version the model performs a transition from MA to PSA with increasing strain. There is avery clear difference between the textures resulting from the two different rules. MA leads to a copper-type texture, and PSA leads to a brass-type texture.