Properties and influence of microstructure and crystal defects in Fe\(_2\)VAl modified by laser surface remelting

Laser surface remelting can be used to manipulate the microstructure of cast material. Here, we present a detailed analysis of the microstructure of Fe\(_2\)VAl following laser surface remelting. Within the melt pool, elongated grains grow nearly epitaxially from the heat-affected zone. These grains...

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Bibliographic Details
Published inarXiv.org
Main Authors Gomell, Leonie, Roscher, Moritz, Bishara, Hanna, Jägle, Eric, Scheu, Christina, Gault, Baptiste
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 25.11.2020
Subjects
Crystal defects
Dislocations
Electrical resistivity
Epitaxial growth
Grain boundaries
Heat affected zone
Lasers
Melting
Microstructure
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Summary:Laser surface remelting can be used to manipulate the microstructure of cast material. Here, we present a detailed analysis of the microstructure of Fe\(_2\)VAl 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 boundaries with 1{\deg}-5{\deg} 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.
ISSN:2331-8422
DOI:10.48550/arxiv.2009.07685