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Influence of backpressure during ECAP on the monotonic and cyclic deformation behavior of AA5754 and Cu99.5

Böhner, Andreas, Kriebel, Florian, Lapovok, Rimma, Höppel, Heinz Werner and Göken, Mathias 2011, Influence of backpressure during ECAP on the monotonic and cyclic deformation behavior of AA5754 and Cu99.5, Advanced engineering materials, vol. 13, no. 4, pp. 269-274, doi: 10.1002/adem.201000269.

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Title Influence of backpressure during ECAP on the monotonic and cyclic deformation behavior of AA5754 and Cu99.5
Author(s) Böhner, Andreas
Kriebel, Florian
Lapovok, Rimma
Höppel, Heinz Werner
Göken, Mathias
Journal name Advanced engineering materials
Volume number 13
Issue number 4
Start page 269
End page 274
Total pages 6
Publisher Wiley
Place of publication Chichester, Eng.
Publication date 2011-04
ISSN 1438-1656
1527-2648
Keyword(s) UFG metals
ECAP
backpressure
cyclic deformation behaviour
Summary Ultrafine-grained (UFG) metals produced by equal channel angular pressing (ECAP) exhibit outstanding mechanical properties. They show high strength under monotonic loading as well as strongly enhanced fatigue lives in the Wöhler S-N-plot compared to their coarse grained (CG) counterparts. It could be shown that the fatigue lives can be significantly enhanced further by applying backpressure during ECAP. Besides the positive effect of backpressure on the processability of hard to deform materials via ECAP, the hydrostatic stress induced by backpressure also influences the mechanical properties under monotonic and cyclic loading. Therefore the influence of backpressure on ECAPed Cu99.5 and on the ECAPed aluminum alloy AA5754 was investigated. It is shown that backpressure has no effect on the hardness and grain size in Cu99.5 but changes the grain boundary misorientation to higher fractions of low angle grain boundaries. Also the temperature dependency of the yield strength as well as the hardening behavior under monotonic compression is affected. The cyclic deformation behavior of Cu99.5 is not strongly influenced by backpressure, but the mean stress level changes drastically. The fatigue life increases with the application of backpressure at low plastic amplitudes due to a change in the crack initiation and propagation. Aim of this work is the investigation of the influence of backpressure during equal channel angular pressing (ECAP) on the mechanical properties under monotonic and cyclic loading. Therefore we performed hardness measurements, compression, and fatigue tests on ECAPed Cu99.5 and AA5754. The results are discussed in terms of microstructure and relevant deformation and damage mechanisms.
Language eng
DOI 10.1002/adem.201000269
Field of Research 091207 Metals and Alloy Materials
0912 Materials Engineering
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2011, WILEY-VCH Verlag GmbH & Co.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30075960

Document type: Journal Article
Collection: Institute for Frontier Materials
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