Chemical segregation and precipitation at anti-phase boundaries in thermoelectric Heusler-Fe2VA1

SCRIPTA MATERIALIA

卷:186

Article

Gomell, Leonie¹  Katnagallu, Shyam^1,5  Diack-Rasselio, Abou²  Maier, Stefan³  Perriere, Loic²  Scheu, Christina¹  Alleno, Eric²  Gault, Baptiste^1,4 

[1] Max Planck Inst Eisenforsch GmbH, Max Planck Str 1, D-40237 Dusseldorf, Germany

[2] Univ Paris Est Creteil, CNRS, ICMPE, UMR7182, 2 Rue Henri Dunant, F-94320 Thiais, France

[3] Rhein Westfal TH Aachen, Inst Phys IA, D-52074 Aachen, Germany

[4] Imperial Coll London, Royal Sch Mines, Dept Mat, London, England

[5] Karlsruhe Inst Technol, Inst Nanotechnol, Hermann von Helmholtzpl 1, D-76344 Eggenstien Leopoldshafen, Germany

关键词: Thermoelectric materials;    Melt spinning;    Atom probe tomography;    Field-ion-microscopy;    Microstructure;   

DOI  :  10.1016/j.scriptamat.2020.04.037

来源: Elsevier

【 摘 要 】

Fe(2)VA1 exhibits promising properties for thermoelectric applications. Here, we investigated the microstructure of melt spun Fe(2)VA1 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 {100}-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 Fe(2)VA1 Thus, these VCxNy precipitates, combined with the APB may efficiently lower the thermal conductivity of the alloy. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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