Analysis of isothermal and isochronal annealing in deformed Zn and Zn-Ag

Author(s)
Barbara Marczewska-Lasa, Michael Zehetbauer, Wolfgang Pfeiler, Bernhard Wielke
Abstract

Zn and Zn-Ag polycrystals have been deformed by rolling at 293 K to true

strains ε=0.05–3.8. After deformation, samples were subjected to

isothermal and isochronal anneals, and thereby investigated by

intermittent measurements of strength, electrical resistivity, and TEM.

Along the isotherms at 293 K, quite unusual hardening effects were

observed, which turned out to be strongly affected by the applied

prestrain and alloy content. The experimental results can be

consistently ascribed to loop formation and loop coarsening from

deformation-induced vacancies whereas other explanations, such as loop

formation by oxidation and/or phase transformations, can be largely

ruled out. Saada's model accounts satisfactorily for the vacancy

concentrations measured. In the framework of a loop-hardening theory by

Kirchner, the experimentally found values of vacancy concentration and

loop density/size yield the right order of magnitude for the strength

effects observed. With the isochronal anneals, three stages could be

found which are related to loop annealing, dislocation rearrangement,

and dislocation annealing.

Organisation(s)
Physics of Nanostructured Materials, Dynamics of Condensed Systems
Journal
Journal of Materials Science
Volume
26
Pages
4499-4510
No. of pages
12
ISSN
0022-2461
DOI
https://doi.org/10.1007/BF00543673
Publication date
1991
Publication status
Published
Peer reviewed
Yes
Austrian Fields of Science 2012
103018 Materials physics
Portal url
https://ucris.univie.ac.at/portal/en/publications/analysis-of-isothermal-and-isochronal-annealing-in-deformed-zn-and-znag(82e98113-20a0-4d74-b7df-cf0c36c3557b).html