Table of Contents
Textures and Microstructures
Volume 14 (1991)–18
http://dx.doi.org/10.1155/TSM.14-18.1153

Texture and Plastic Anisotropy in Model Aluminium - Lithium Alloys

1Institut für Metallkunde und Metallphysik, RWTH Aachen, Germany
2Materials Department, Ecole des Mines de St-Etienne, France

Copyright © 1991 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 specific roles of Li, Zr and Cu alloying elements in Al-Li alloys have been investigated in terms of their influence on texture evolution during rolling and subsequent plastic anisotropy. Three model alloys; Al-2.3% Li, Al-2.3% Li-0.1% Zr and Al-2.3% Li-1.2% Cu-0.1% Zr were hot and cold rolled to reductions up to 92% and their texture evolution systematically characterised by X-ray pole figures and complete ODFs. Hot rolling of the Zr containing alloys, which do not recrystallize, led to a strong Bs texture component. Cold rolling of all alloys gave the usual Taylor-type β fibre components, with certain variations according to the precipitation state which can favour or inhibit shear banding.

Pronounced plastic anisotropies, R(α), were measured on the rolled sheets with Rmin at α = 0° and Rmax at α ≈ 60°. Actual values depend upon rolling temperature and strain but typically Rmin ≈ 0.3 and Rmax ≈ 1.5 to 2. The quantitative texture data was used together with the CMTP and Taylor models to predict the anisotropy; in general the CMTP model gave a reasonable correlation with the experimental values.