Dresden 2020 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 7: Transport - Atoms and Ions II

MM 7.2: Vortrag

Montag, 16. März 2020, 12:00–12:15, IFW A

Influence of high current densities on nanocrystalline FeC thin films — •Thomas Brede, Reiner Kirchheim, and Cynthia Volkert — Institut für Materialphysik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The goal of our study is to understand the influence of high direct current densities on nanocrystalline materials with solute atoms. The latter will be moved by electromigration and causes changes in the microstructure of the host lattice which were in this way the first time described this year [1]. The FeC thin film model system allows to reach current densities up to several MA/cm². Different SEM and X-ray techniques are used to observe the changes in microstructure and texture due to the treatment. We will provide detailed experimental results for is model system as well as a mechanism which might explain the observations.
[1] Brede, T., Kirchheim, R., Volkert, C. A. (2020). Anisotropic grain growth in iron-carbon films at high electric current densities. Scripta Materialia, 178, 18-23.