Chemical segregation and precipitation at anti-phase boundaries in thermoelectric Heusler-Fe2VAl
Résumé
Fe2VAl exhibits promising properties for thermoelectric applications. Here, we investigated the microstructure of melt spun Fe2VAl using electron microscopy, atom probe tomography and field ion microscopy. We observe platelet-shaped VCxNy precipitates in the vicinity of antiphase boundaries (APB) oriented along the {010}-plane. The mean distance between these precipitates is (140 ± 40) nm. This distance is shorter than the mean free phonon path at room temperature in Fe2VAl, thus, these VCxNy precipitates, combined with the APB may efficiently lower the thermal conductivity of the alloy.
Domaines
Chimie inorganique
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