Table of Contents
Textures and Microstructures
Volume 23, Issue 1, Pages 7-19
http://dx.doi.org/10.1155/TSM.23.7

Microtextural Characterization of a Beryllium Weldment

Los Alamos National Laboratory, Los Alamos, NM 87545, USA

Received 14 June 1994

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.

Abstract

Local grain orientations in a beryllium weldment have been characterized using an automatic technique based on computer indexing of electron backscatter diffraction patterns. The results indicate that many weld grains are epitaxially nucleated from the base metal. The number of grains allowed further growth is quickly reduced based on their orientations relative to the macroscopic growth direction. Grains with <101¯0> crystallographic directions parallel to the macroscopic growth direction tend to dominate. Examination of the spatial distribution of orientation within individual grains shows that, while the macroscopic growth direction changes during solidification, the crystallographic orientation does not. That is, substantial deformation of the weld grains does not occur during grain growth. Analyses adjacent to the centerline fracture indicate that the fracture plane correlates best with {112¯0} crystallographic planes.