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MM: Fachverband Metall- und Materialphysik

MM 28: Transport I - atomic transport

MM 28.1: Vortrag

Dienstag, 21. März 2017, 10:15–10:30, IFW D

Volume diffusion in high-entropy Al_xCoCrFeNi alloys — •Josua Kottke¹, Simon Trubel¹, Matthias Wegner¹, Louis J. Santodonato², Sergiy V. Divinski¹, and Gerhard Wilde¹ — ¹Institute of Materials Physics, Unversity of Münster, Germany — ²Department of Materials Science and Engineering, The University of Tennessee, Knoxville, USA

High-entropy alloys, i.e. multicomponent alloys with a large number of constituting elements in equiatomic or nearly equiatomic composition, attract an increased attention as potential structural materials due to their favorable mechanical and physical properties, especially at elevated temperatures. In the present study, the tracer diffusion of Cr, Co, Fe, and Ni is measured in the Al_xCoCrFeNi alloys at 1000^∘C and 1100^∘C applying the ⁵¹Cr, ⁵⁷Co, ⁵⁹Fe and ⁶³Ni radioisotopes, respectively. The addition of Al to the CoCrFeNi FCC alloy is known to induce the appearance of a two-phase, FCC+BCC, microstructure which is examined using EBSD and EDX analyses. A correlation between the phase decomposition tendency and the tracer diffusivities of constituent elements is discussed.