  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.
