论文标题
在Fe $ _2 $ _2 $ val中，由激光表面再覆盖修饰的微观结构和晶体缺陷的特性和影响
Properties and influence of microstructure and crystal defects in Fe$_2$VAl modified by laser surface remelting
论文作者
论文摘要
激光表面再效率可用于操纵铸件的微观结构。在这里，我们介绍了激光表面再现后Fe $ _2 $ val的微观结构的详细分析。在熔体池中，细长的谷物几乎从热影响区域出现。这些晶粒被低角度的晶界隔开，并以1°-5°的不良取向。使用Atom探针断层扫描观察到晶界和位错下钒，碳和氮的分离。局部电阻率是通过原位四点探针技术测量的。与铸造样品中的高角度晶界相比，在这些低角度晶界，在这些低角度晶界的电阻率的增加较小。这表明晶界工程可能有可能用于操纵热电特性。
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°-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.
