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MM: Fachverband Metall- und Materialphysik
MM 20: Topical Session: Interface-dominated phenomena - Diffusion
MM 20.4: Vortrag
Dienstag, 17. März 2020, 11:15–11:30, IFW A
Mechano-chemical coupling by microstructure evolution of an Al-Sc-Zr-based alloy — •Bengü Tas, Friederike Emeis, Vladislav Kulitcki, Martin Peterlechner, Gerhard Wilde, and Sergiy V. Divinski — Institute of Materials Physics, University of Münster, Münster, Germany
Al-based alloys are attractive materials for aerospace applications owing to their low density, sufficient weldability and superior strength at room temperature. Severe plastic deformation via equal channel angular pressing at 300∘C for 12 passes is applied on a technical AA5024 Al-based alloy in order to produce an ultrafine grained microstructure (UFG) with different types of micro- and nano-precipitates, basically Al6Mn and Al3(Sc,Zr,Ti). Heat treatments under different external stress fields are subsequently applied using a universal testing machine. The impact of the stress state (pure shear, uniaxial compression or stress-free annealing) on the microstructure evolution including relaxation of residual strains and precipitation is investigated. The mechano-chemical coupling on different scales is examined with a focus on the evolution of core-shell Al3(Sc,Zr,Ti) particles. Pure shear results in relatively large grains with a bimodal size distribution, in contrast to smaller, homogenously distributed grains under uniaxial compression. The impact of the stress state on nano-precipitate evolution is elucidated using analytical and high-resolution transmission electron microscopy.