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The Effect of Nb Addition on the Microstructure and the High-Temperature Strength of Fe3Al Aluminide

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Abstract

The microstructural and high-temperature mechanical properties of Fe–26Al–xNb (x = 3 and 5 at. pct) are compared. The alloys were investigated “as cast” and after hot rolling at 1473 K (1200 °C). Scanning electron microscopes equipped with EDS and EBSD were used for the microstructure and phase identification. The addition of 3 at. pct of Nb into the Fe3Al matrix leads to the formation of C14 λ—Laves phase (Fe,Al)2Nb (LP) particles spread in the Fe3Al matrix, while an eutectic with thin lamellae of LP C14 λ—Laves phase (Fe,Al)2Nb and matrix is also formed in the iron aluminide with 5 at. pct of Nb. The presence of incoherent precipitates is connected with the enhancement of the high-temperature strength and creep resistance.

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Acknowledgments

The research was supported by the Grant Agency of the Czech Republik through the Project No. 16-05608S and with the support of the Institutional Endowment for the Long Term Conceptual Development of Research Institutes (at the Technical University of Liberec), as provided by the Ministry of Education, Youth and Sports of the Czech Republic in the year 2017.

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Authors and Affiliations

  1. Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116, Prague 2, Czech Republic

    Petr Kratochvíl, Robert Král, Jozef Veselý & Pavel Lukáč

  2. Department of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 2, 460 01, Liberec, Czech Republic

    Martin Švec

  3. Laboratory of High Temperature Materials, SVUM, a.s., Podnikatelská 565, 190 11, Prague 9, Czech Republic

    Tomáš Vlasák

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  1. Petr Kratochvíl
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  2. Martin Švec
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  3. Robert Král
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  4. Jozef Veselý
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Correspondence to Martin Švec.

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Manuscript submitted October 10, 2017.

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Kratochvíl, P., Švec, M., Král, R. et al. The Effect of Nb Addition on the Microstructure and the High-Temperature Strength of Fe3Al Aluminide. Metall Mater Trans A 49, 1598–1603 (2018). https://doi.org/10.1007/s11661-018-4524-4

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  • DOI: https://doi.org/10.1007/s11661-018-4524-4

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