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Design of a dual-phase hcp-bcc high entropy alloy strengthened by ω nanoprecipitates in the Sc–Ti–Zr–Hf–Re system

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Ikeda,  Yuji
Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Institute of Materials Science, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germany;

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Körmann,  Fritz
Computational Phase Studies, Computational Materials Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands;

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Citation

Rogal, L., Ikeda, Y., Lai, M., Körmann, F., Kalinowska, A., & Grabowski, B. (2020). Design of a dual-phase hcp-bcc high entropy alloy strengthened by ω nanoprecipitates in the Sc–Ti–Zr–Hf–Re system. Materials and Design, 192: 108716. doi:10.1016/j.matdes.2020.108716.


Cite as: http://hdl.handle.net/21.11116/0000-0007-0AB5-2
Abstract
High entropy alloys (HEAs) in the hexagonal close-packed (hcp) phase usually show poor mechanical properties. We demonstrate here, by use of ab initio simulations and detailed experimental investigations, that the mechanical properties can be improved by optimizing the microstructure. In particular we design a dual-phase HEA consisting of a body-centered cubic (bcc) matrix and hcp laths, with nanoprecipitates of the ω phase in the Sc-Ti-Zr-Hf-Re system, by controlling the Re content. This dedicated microstructure reveals, already in the as-cast state, high compressive strength and good ductility of 1910 MPa and 8, respectively. Our study lifts the hcp-based HEAs onto a competitive, technological level. © 2020 The Authors