No 1, Vol. 1, 2000 
 

TEM AND STM INVESTIGATIONS ON THE DISCLINATION
NATURE OF FRAGMENT BOUNDARY TRIPLE JUNCTIONS

M. Seefeldt

Freiberg University of Mining and Technology,
Institute of Physical Metallurgy,
Gustav-Zeuner-Strasse 5, D-09596 Freiberg, Germany
Present address: Catholic University of Leuven,
Department of Metallurgy and Materials Engineering,
Willem de Croylaan 2, B-3001 Heverlee, Belgium

Abstract

After a short review of recent TEM measurements to characterize partial disclinations in fragment boundary triple junctions in cold-rolled copper, STM results from the same specimens are presented which support a disclination interpretation of the observed fragment structure. The role of the fragment boundary mosaic or of the corresponding immobile partial disclination network in work-hardening is discussed. Although the orientational mismatches around the fragment boundary triple junctions are only small, the disclination contribution dominates work-hardening behaviour at large strains.

full paper (pdf, 208 Kb)