Table of Contents
Textures and Microstructures
Volume 23, Issue 3, Pages 149-171

Evolution of r-Value During the Tensile Deformation of Aluminium

1Department of Metallurgical Engineering, McGill University, 3450 University Street, Montreal H3A-2A7, Canada
2Alcan International Limited, Kingston Reasearch and Development Centre, Canada

Received 26 December 1994; Accepted 28 January 1995

Copyright © 1995 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.


The elastic strain ratios associated with specific ideal orientations as well as with particular experimental textures were derived from the second order Hill approximation. The single crystal elastic constants for pure aluminum and copper were used. Plastic strain ratios were then calculated for the experimental textures using the FC (full constraint), RC (relaxed constraint) and LW (least work) crystal plasticity codes. Tests were also carried out to determine the r-values along various directions in the sheet during Lüders band propagation, as well as the dependence on strain of the plastic r-value. It is shown that the observed strain dependence of the r-value is related to Lüders band propagation and to the evolution of the texture and not to the elastic-plastic transition.