Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 56: Bulk Materials: Soft and hard permanent magnets

MA 56.4: Vortrag

Donnerstag, 23. März 2017, 15:45–16:00, HSZ 403

Reliability of bulk combinatorial reactive crucible melting approach to search for new permanent magnets: a Fe-Sn case study — •Bahar Fayyazi, Konstantin Skokov, Dmitriy Karpenkov, and Oliver Gutfleisch — Technical University of Darmstadt

The search for new magnetic materials using conventional equilibrated alloy methods is an expensive and time-consuming task. Therefore, high-throughput methods where multiple alloy compositions (material libraries) can be synthesized and characterized together would be a powerful tool. Reactive crucible melting (RCM) as well as diffusion couple/multiple approach are potential bulk high-throughput methods in order to speed up the discovery and examination of new materials. However, in previous investigations [1] by diffusion multiple approach, it has been found that under specific conditions there may exist some phases which are not forming by interdiffusion reactions. This assessment motivated us to evaluate whether a similar situation may occur in RCM method. Therefore, a detailed study has been conducted on the simple and well-studied Fe-Sn binary system by correlating the forming phases in reactive crucible samples to the known phase diagram. Simultaneously, under the same conditions as for the crucibles, 10 individual homogeneous samples were prepared by conventional metallurgy and the results were compared to RCM samples. Discrepancies which have been observed will be discussed in this work.

[1] J.C. Zhao, Reliability of the diffusion-multiple approach for phase diagram mapping, J. Mater. Sci., 39 (2004) 3913-3925.