Structure of Complex Concentrated Alloys Derived from Iron Aluminide Fe3Al

• Published in: Materials Vol. 16; no. 15; p. 5388
• Main Authors: Pešička, Josef, Kratochvíl, Petr, Král, Robert, Veselý, Jozef, Jača, Eliška, Preisler, Dalibor, Daniš, Stanislav, Minárik, Peter, Čamek, Libor
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 31.07.2023; MDPI
• Subjects: Alloying; Alloys; Atoms & subatomic particles; Calphad; Composition; Electron microscopy; entropy alloys; Ferrous alloys; Grain size; Intermetallic phases; Iron aluminides; Mechanical properties; microstructure; Phase separation; Sigma phase; Solid phases; Solid solutions; Temperature
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma16155388

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: Fe3(100−3x)/4 Al(100−3x)/4VxCrxNix). 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.