Journal
SCRIPTA MATERIALIA
Volume 193, Issue -, Pages 153-157Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2020.10.050
Keywords
Thermoelectric materials; Atom probe tomography; Microstructure; Grain boundary defects; Laser surface remelting
Categories
Funding
- IMPRS-SurMat
- Studienstiftung des deutschen Volkes
- ERC [787446]
- European Research Council (ERC) [787446] Funding Source: European Research Council (ERC)
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Laser surface remelting of Fe2VAl results in the growth of elongated grains nearly epitaxially within the melt pool, with low-angle grain boundaries exhibiting segregation of vanadium, carbon, and nitrogen. The study suggests that grain boundary engineering can potentially be used to manipulate thermoelectric properties, as indicated by a smaller increase in electrical resistivity at low-angle grain boundaries compared to high-angle grain boundaries in cast samples.
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.
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