Use of symmetry in the TEM analysis of precipitate morphologies. [Al-Ge]

Conference · Sat Feb 01 04:00:00 EST 1986

OSTI ID:6123013

Dahmen, U; Westmacott, K H

This study points out how symmetry properties inherent in precipitation reactions can be exploited to facilitate and improve the accuracy of a morphological analysis by TEM. A method is given for the simple determination of the direction and distribution of needle precipitates and the habit plane of plate precipitates based on the use of symmetry properties of the matrix crystal. The bicrystal symmetry of different orientation relationships between cubic crystals and its connection with observed and equilibrium shapes is illustrated with examples of high resolution micrographs of Ge precipitates in an Al matrix. 11 figs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6123013
• Report Number(s): LBL-20706; CONF-851217-61; ON: DE86008371
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BICRYSTALS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
CUBIC LATTICES
ELECTRON MICROSCOPY
GERMANIUM ALLOYS
HARDENING
MICROSCOPY
POLYCRYSTALS
PRECIPITATION HARDENING
SYMMETRY
TRANSMISSION ELECTRON MICROSCOPY