Structure of Complex Concentrated Alloys Derived from Iron Aluminide Fe3Al

Josef Pešička; Petr Kratochvíl; Robert Král; Jozef Veselý; Eliška Jača; Dalibor Preisler; Stanislav Daniš; Peter Minárik; Libor Čamek

doi:10.3390/ma16155388

Structure of Complex Concentrated Alloys Derived from Iron Aluminide Fe₃Al

Materials (Basel). 2023 Jul 31;16(15):5388. doi: 10.3390/ma16155388.

Authors

Josef Pešička¹, Petr Kratochvíl¹, Robert Král¹, Jozef Veselý¹, Eliška Jača¹, Dalibor Preisler¹, Stanislav Daniš², Peter Minárik¹, Libor Čamek³

Affiliations

¹ Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech Republic.
² Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech Republic.
³ Department of Foundry Engineering, Brno University of Technology, Technická 2896/2, 61669 Brno, Czech Republic.

Abstract

The phase structure and composition of a series of four alloys based on Fe₃Al was investigated by means of scanning electron microscopy, X-ray diffraction and transmission electron microscopy. The materials were composed of Fe and Al with a fixed ratio of 3:1 alloyed with V, Cr and Ni at 8, 12, 15 and 20 at. % each (composition formula: Fe_3(100-3x)/4 Al_(100-3x)/4V_xCr_xNi_x). For 8% alloying, the material is single-phase D0₃. Furthermore, 12 and 15% alloying results in bcc-B2 phase separation on two length scales. Moreover, 20% alloying gives rise to the FeNiCrV σ phase supplemented by B2. These findings are discussed with respect to the results obtained via Calphad modeling using the TCHEA5 database and can serve in further improvement.

Keywords: Calphad; entropy alloys; microstructure.

Abstract

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