Table of Contents
Textures and Microstructures
Volume 34, Issue 4, Pages 205-216
http://dx.doi.org/10.1155/TSM.34.205

Study of the Deformation Mechanisms of the Superplastic Alloy Ai–Li 2090 by Texture Analysis

1Department of Physical Metallurgy, Centro Nacional de Investigaciones Metalúrgicas (CENIM), C.S.I.C. Avda. Gregorio del Amo, 8, Madrid 28023, Spain
2Department of Mechanical and Aerospace Engineering, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0411, USA

Received 4 February 2000

Copyright © 2000 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 deformation mechanisms of a superplastic Al–Li 2090 alloy have been investigated by means of texture analysis. It has been found that both crystallographic slip (CS) and grain boundary sliding (GBS) operate in response to the applied stress over a wide range of deformation, conditions. This is in contrast to well-accepted creep models, which predict that only one mechanism should operate and that the transition from one mechanism to another is abrupt and takes place over a narrow range of deformation conditions. Additionally, according to geometric (Taylor-type) models of uniaxial deformation for CS, the 110, 111, or 001 fibers should appear when 4, 6, or 8 slip systems operate. Here, however, CS contributes to stabilize orientations belonging to the α and β fibers.