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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.15: Poster

Dienstag, 21. März 2017, 18:30–20:30, P4

Properties of mechanically intermixed Cu-Ta alloys — •Regina Post, Nazar Ibrahim, Sergiy Divinski, and Gerhard Wilde — Institute of Materials Physics, University of Münster, Germany

Copper and tantalum are known to be fully immiscible and do not form an alloy by cooling from the liquid state. They can however be forced to mix by severe plastic deformation methods, such as high pressure torsion (HPT). Using HPT on a stack of alternating Cu and Ta thin foils, different mixing states can be created.

The present study is focused on the evolution of the microstructure with increasing number of revolutions of the HPT process by comparison of the cross section and plain view structures via orientation imaging microscopy applying the EBSD analysis. The microstructure of copper-rich grains is found to be remarkably stable even after annealing at high temperatures of about 95% of the copper melting point. The appearance of the Cu-Ta solid solution is investigated by TEM analyses and the results are discussed in terms of the mixing mechanism.