arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2009.07685cond-mat.mtrl-sci
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laser表面重熔改性Fe $_2$ VAl的性能及组织和晶体缺陷的影响

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

Leonie Gomell, Moritz Roscher, Hanna Bishara, Eric Jägle, Christina Scheu, Baptiste Gault

摘要:

激光表面重熔可以用来控制铸造材料的显微组织。在这里,我们提出了一个详细的微观结构的Fe $_2$ VAl激光表面重熔分析。在熔池内,细长晶粒从热影响区几乎外延生长。这些晶粒被具有1°-5°取向差的小角度晶界分开。钒,碳,氮在晶界和位错偏析观察使用原子探针断层扫描。局部电阻率的测量通过原位四点探针技术。与铸造样品中的高角度晶界相比,在这些低角度晶界处观察到电阻率的较小增加。这表明,晶界工程可能被用来操纵热电性能。

英文摘要:

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.

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