Vacancy production during plastic deformation in copper determined by in situ X-ray diffraction

Autor(en)

Tamas Ungar, Erhard Schafler, Peter Hanak, Sigrid Bernstorff, Michael Zehetbauer

Abstrakt

The discrepancy between stored energies measured by calorimetry and residual electrical resistivity, and calculated from dislocation densities measured either by transmission electron microscopy or X-ray line broadening in copper, is interpreted in terms of vacancies produced during plastic deformation. The presence of excess vacancies is further substantiated by concomitant measurements of residual electrical resistivity. Diffuse X-ray scattering is correlated with excess vacancy concentrations in the grain interior and grain boundary regions in polycrystalline copper. Grain boundaries are suggested to be the main sites for vacancy storage probably in the form of voids or free volume. This would support the concept that grain boundaries are distorted regions with considerable fractions of free volume. The vacancy storage rate is shown to depend on the mode of deformation. © 2006 Elsevier B.V. All rights reserved.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

Eötvös Loránd University Budapest, Elettra Sincrotrone Trieste

Journal

Materials Science and Engineering A: Structural Materials: Properties, Microstructures and Processing

Band

462

Seiten

398-401

Anzahl der Seiten

4

ISSN

0921-5093

DOI

https://doi.org/10.1016/j.msea.2006.03.156

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/2ab6b6ea-11db-469b-a0d1-1b953a9552b7