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FIRST-PRINCIPLES STUDY OF INTERFACE ENERGIES IN Fe-Al-BASED SUPERALLOY NANOCOMPOSITES

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MIHÁLIKOVÁ Ivana SLÁVIK Anton FRIÁK Martin VŠIANSKÁ Monika KOUTNÁ Nikola HOLEC D. ŠOB Mojmír

Druh Článek ve sborníku
Konference 9th International Conference on Nanomaterials - Research and Application (NANOCON)
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Klíčová slova Nanocomposites; Fe-Al based superalloys; ab initio calculations; interface energies
Popis Fe-Al-based nanocomposites with a superalloy-type of microstructure constitute a very promising class of materials. They possess a great potential as an alternative to the currently used steel grades in high temperature applications. Intermetallics-containing nanocomposites, such as those with the Fe3Al compound being one of the phases, may open a way towards future automotive and energy-conversion technologies with lower fuel consumption and reduced environmental impact. We employ quantum-mechanical calculations to analyze relations between ordering tendencies of Al atoms in the disordered Fe-18.75at.% Al phase on one hand and thermodynamic, structural and magnetic properties of Fe-Al-based nanocomposites on the other. When comparing supercells modeling disordered Fe-Al phase with different atomic distribution of atoms we find out that the supercell without 1st and 2nd nearest neighbor Al-Al pairs has a lower energy than that mimicking a perfect disorder (a special quasi-random structure, SQS). Further, coherent interfaces with (001), (110) and (1-10) crystallographic orientations between Fe3Al compound and SQS Fe-Al phase have higher energies than those exhibiting atomic distribution without 1st and 2nd nearest neighbor Al-Al pairs.
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