Table of Contents
Textures and Microstructures
Volume 21 (1993), Issue 4, Pages 219-232
http://dx.doi.org/10.1155/TSM.21.219

A Microtexture Investigation of Side-Branched Fatigue Cracks in 8090 Al-Li Sheet

Department of Materials Engineering, University College of Swansea, Singleton Park, Swansea SA2 8PP, UK

Accepted 2 January 1993

Copyright © 1993 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

Electron back-scatter diffraction has been used to assess the microtexture of regions of 8090 Al-Li sheet both where side-branched fatigue cracking has occurred and in control areas unaffected by cracking. The microtextures did not reflect the macrotexture as measured by X-rays, indicating inhomogeneous distributions of orientations. The microtexture of the “cracked” grains was complex and was deconvoluted to reveal several components dominated by the S-texture. The principal difference between “cracked” and “control” grains was that for the former the four crystallographically related S variants were intimately mixed on an individual grain scale whereas in the latter was mainly a single variant in a particular area. The results are discussed in terms of both recovery and recrystallisation mechanisms.