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MM: Fachverband Metall- und Materialphysik

MM 18: Poster Session I

MM 18.11: Poster

Montag, 16. März 2020, 18:15–20:00, P4

Analysis of grain boundary character and the resulting hardness distribution in High Entropy Alloys — •Lydia Daum, Bengü Tas, Martin Peterlechner, Sergiy Divinskiy, and Gerhard Wilde — Institute of Materials Physics

In this study four and five component alloys, CoCrFeNi and CoCrFeMnNi respectively, were prepared with different heat treatments to analyse their grain boundary character and their microstructures and mechanical properties. Thus, XRD, EBSD, EDX and Vickers microhardness indentation measurements have been carried out. The equiatomic distribution of the alloy components was shown with EDX maps for the polycrystalline alloys. A CoCrFe and a MnNi rich area was identified for the five component alloy which had been annealed at 500°C. An increase in hardness of about 8% was observed after annealing at temperatures between 500°C and 600°C for CoCrFeMnNi and CoCrFeNi, respectively. To compare each hardness value with respect to the grain orientation, a grid of hardness indentations were imprinted onto the sample surface and that surface was subsequently analyzed again by EBSD. Calculating for each hardness measurement the Schmid factor, a correlation between orientation and hardness was observed. Especially indentations in (1 1 1)-planes measured increased hardness values.