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On the effect of precipitates on the cyclic deformation behavior of an Al–Mg–Si alloy

Published online by Cambridge University Press:  11 September 2017

Haichun Jiang ,
Stefanie Sandlöbes ,
Günter Gottstein  and
Sandra Korte-Kerzel Open the ORCID record for Sandra Korte-Kerzel [Opens in a new window]
Haichun Jiang
Affiliation:
Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen 52056, Germany
Stefanie Sandlöbes*
Affiliation:
Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen 52056, Germany
Günter Gottstein
Affiliation:
Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen 52056, Germany
Sandra Korte-Kerzel*
Affiliation:
Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen 52056, Germany
*
a) Address all correspondence to these authors. e-mail: sandloebes@imm.rwth-aachen.de
b) e-mail: korte-kerzel@imm.rwth-aachen.de
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Abstract

Fatigue is one of the major failure modes of structural materials. While the effects of strengthening precipitates on the mechanical properties of heat treatable aluminum alloys during forming operations are well-studied, only little is known about the related mechanisms during fatigue. We study the influence of precipitates during low cycle fatigue of an Al–Si–Mg alloy by mechanical testing and microstructure characterisation using (scanning) transmission electron microscopy. Specifically, we have investigated under-aged, peak-aged, and over-aged precipitation states. The experiments reveal considerable influence of the precipitate state on the mechanical properties and the formed dislocation structures. Under-aged AA6016 experiences cyclic hardening accompanied by dynamic precipitation and precipitate growth during cyclic deformation, whereas peak-aged AA6016 shows a saturated cyclic stress behavior and the formation of a ‘prevein’-like dislocation structure aligned along [001]Al directions. Over-aged AA6016 exhibits cyclic softening, which is assumed to be due to frequent Orowan-looping of dislocations around incoherent precipitates.

Keywords

fatiguedislocationstransmission electron microscopy (TEM)
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 23: Focus Issue: Mechanical Properties and Microstructure of Advanced Metallic Alloys—in Honor of Prof. Haël Mughrabi PART A , 14 December 2017 , pp. 4398 - 4410
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Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Mathias Göken

References

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