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MM: Fachverband Metall- und Materialphysik

MM 67: Mechanical Properties I

MM 67.1: Vortrag

Donnerstag, 23. März 2017, 15:45–16:00, IFW D

On the effects of precipitates during cyclic deformation of AA6016 alloy — •Haichun Jiang, Stefanie Sandlöbes, and Sandra Korte-Kerzel — RWTH Aachen University, Aachen, Germany

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 electron backscatter diffraction and scanning transmission electron microscopy (STEM). Under-aged, peak-aged and over-aged precipitation states are studied. The experiments reveal a significant influence of the precipitate state on both, the mechanical properties and the formed dislocation structures.