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Structure of Complex Concentrated Alloys Derived from Iron Aluminide Fe3Al
Josef Pešička1, Petr Kratochvíl1, Robert Král1
1Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 12116 Prague, Czech Republic.
Materials (Basel, Switzerland)
|August 12, 2023
Summary
This study investigated Fe3Al alloys with V, Cr, and Ni. Increasing alloy content shifted the phase structure from single-phase D03 to complex B2 and sigma phases, aiding material design.
Area of Science:
- Materials Science
- Metallurgy
- Solid-State Chemistry
Background:
- Fe3Al-based alloys are crucial for high-temperature applications.
- Understanding their phase evolution with alloying elements is essential for optimizing properties.
- Ternary and quaternary alloying can significantly alter the phase stability and microstructure.
Purpose of the Study:
- To investigate the phase structure and composition of Fe3Al alloys with varying V, Cr, and Ni content.
- To correlate experimental findings with CALPHAD (Calculation of Phase Diagrams) modeling.
- To provide insights for the further development of advanced Fe3Al-based materials.
Main Methods:
- Experimental investigation using scanning electron microscopy (SEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM).
- Alloying of Fe3Al with V, Cr, and Ni at 8, 12, 15, and 20 at. %.
- CALPHAD modeling utilizing the TCHEA5 database.
Main Results:
- An 8 at. % alloy exhibited a single-phase D03 structure.
- 12 and 15 at. % alloying led to bcc-B2 phase separation across two length scales.
- 20 at. % alloying resulted in the formation of the FeNiCrV sigma (σ) phase alongside the B2 phase.
Conclusions:
- The phase structure of Fe3Al alloys is highly sensitive to the concentration of V, Cr, and Ni.
- Experimental results align with CALPHAD predictions, validating the model's utility.
- These findings contribute to a deeper understanding of phase formation and can guide future alloy design for improved performance.
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