Table of Contents
Textures and Microstructures
Volume 20, Issue 1-4, Pages 67-86
http://dx.doi.org/10.1155/TSM.20.67

Local Pole Figures in the Tem— Measurement and ODF Determination

Alcoa Technical Center, Alcoa Center, PA 15069, USA

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

Techniques for the measurement of local pole figures in the Transmission Electron Microscope (TEM) are summarized and applications to deformed aluminum are given. Local pole figures are obtained by measuring the intensity distribution along ring patterns in Selected Area Diffraction (SAD) separately for various tilts of the specimen with respect to the incident electron beam. The computer control of the TEM allows a data acquisition in reasonable time. The measured intensities are corrected either experimentally or analytically for the increase of sampled volume and for the increased absorption with increasing tilt angle of the specimen. The application of orientation distribution functions (ODF) using the series expansion technique in conjunction with the positivity method allows a quantitative texture analysis of the pole figures.