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

Pages

4499-4510

No. of pages

ISSN

0022-2461

DOI

https://doi.org/10.1007/BF00543673

Publication date

1991

Peer reviewed

Yes

Austrian Fields of Science 2012

103018 Materials physics

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