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Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Poster session I

MM 12.28: Poster

Montag, 1. April 2019, 19:15–20:45, Poster C

Impact of Severe Plastic Deformation on AlxCoCrFeNi High Entropy Alloys — •Lena Frommeyer1, Mehdi Eizadjou2, Anna Ceguerra2, Peter K. Liaw3, Harald Rösner1, Sergiy Divinski1, Simon Ringer2, and Gerhard Wilde11Institute of Materials Physics, University of Münster, Münster, Germany — 2Australian Center for Microscopy and Microanalysis, University of Sydney, Australia — 3Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA

During the last few years, a new class of materials called high entropy alloys has been extensively studied. The multi-principal element approach opens a wide compositional space with complex possibilities of combining 5 or more elements, each of them having originally equi-atomic concentration. The main research focus was initially set to obtain single-phase alloys. However, secondary phases in alloys can lead to improved properties. In this study, the high entropy alloy AlCoCrFeNi was modified by adding Al in various amounts. Moreover, the arc melted and homogenized alloys have been severely deformed by high pressure torsion (HPT). Subsequently, the un-deformed as well as the severely deformed alloys were examined by X-ray diffraction, electron back-scatter diffraction/transmission Kikuchi diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy and atom probe tomography. Transitions from pure fcc to fcc+B2 and to fcc+B2+A2 as well as severe grain refinement and high twin densities were observed and are discussed with respect to the variations of composition and strain.

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