Abstract 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 boundaries with 1°–5° 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.

中文翻译：

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激光表面重熔改性 Fe2VAl 组织和晶体缺陷的性质及影响

摘要 激光表面重熔可用于控制铸造材料的微观结构。在这里，我们对激光表面重熔后的 Fe2VAl 进行了详细分析。在熔池内，细长的晶粒几乎从热影响区外延生长。这些晶粒被具有 1°–5° 错误取向的小角度晶界隔开。使用原子探针断层扫描观察到钒、碳和氮在晶界和位错处的偏析。通过原位四点探针技术测量局部电阻率。与铸造样品中的大角度晶界相比，在这些小角度晶界处观察到电阻率的较小增加。这表明晶界工程可以潜在地用于操纵热电特性。