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

Laser surface remelting can be used to manipulate the microstructure of cast material. Here, we present a detailed analysis Fe$_2$VAl following laser remelting. Within melt pool, elongated grains grow nearly epitaxially from heat-affected zone. These are separated by low-angle grain boundaries with 1{\deg}-5{\deg} misorientations. Segregation vanadium, carbon, and nitrogen at dislocations is observed using atom probe tomography. The local electrical resistivity was measured an in-situ four-point-probe technique. A smaller increase in these compared high-angle sample. This indicates that boundary engineering could potentially thermoelectric properties.