Properties and influence of microstructure and crystal defects in Fe2VAl modified by laser surface remelting

SCRIPTA MATERIALIA

卷:193

Article

Gomell, Leonie¹  Roscher, Moritz¹  Bishara, Hanna¹  Jaegle, Eric A.^1,2  Scheu, Christina¹  Gault, Baptiste^1,3 

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

[2] Univ Bundeswehr Munchen, Inst Werkstoffkunde, Werner Heisenberg Weg 39, D-85577 Neubiberg, Germany

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

关键词: Thermoelectric materials;    Atom probe tomography;    Microstructure;    Grain boundary defects;    Laser surface remelting;   

DOI  :  10.1016/j.scriptamat.2020.10.050

来源: Elsevier

【 摘 要 】

Laser surface remelting can be used to manipulate the microstructure of cast materials. Here, we present a detailed analysis of Fe2VAl following laser surface remelting. Within the melt pool, elongated grains grow nearly epitaxially from the heat-affected zone. These grains are separated by low-angle grain bound-aries with 1 degrees-5 degrees misorientations. Segregation of vanadium, carbon, and nitrogen at grain boundaries and dislocations is observed using atom probe tomography. The local electrical resistivity was measured by an in-situ four-point-probe technique. A smaller increase in electrical resistivity is observed at these low angle grain boundaries compared to high-angle grain boundaries in a cast sample. This indicates that grain boundary engineering could potentially be used to manipulate thermoelectric properties. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

【 授权许可】

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