Abstract This study proposed a multi-component alloy FeCrNiAl 0.5 as a candidate materials for structural applications at high temperatures. The phase structure, microstructure and chemical composition of the alloy were characterized. The results show that the alloy possesses only BCC crystal structure consisting of the ordered (Ni,Al) phase and disordered [Fe, Cr] phase. Microstructural observation combined with XRD results clearly show that the as-cast alloy exhibits a non-homogeneous microstructure with pronounced dendritic and interdendritic regions. Besides, the as-cast alloy possesses great electrical and thermal conductivity compared with other HEAs and nickel-based alloy. Moreover, the oxidation behaviors at high temperature were systematically investigated and shows a surprisingly good oxidation resistance property compared with commercially available steels and alloys. The oxidation active energy is 259.3740 kJ/mol ranging from 1173 to 1273 K. The predominant oxide is Al 2 O 3 , Cr 2 O 3 and FeCr 2 O 4 and the oxidation mechanisms were further discussed. This study suggests that FeCrNiAl 0.5 multi-component alloy exhibites great promise for high temperature structural materials.

中文翻译：

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FeCrNiAl0.5多组分合金的热物理性能和高温氧化行为

摘要 本研究提出了一种多组分合金 FeCrNiAl 0.5 作为高温结构应用的候选材料。对该合金的相结构、显微组织和化学成分进行了表征。结果表明，该合金仅具有由有序 (Ni,Al) 相和无序 [Fe, Cr] 相组成的 BCC 晶体结构。显微组织观察结合 XRD 结果清楚地表明，铸态合金呈现出具有明显树枝状和树枝状区域的非均匀组织。此外，与其他 HEAs 和镍基合金相比，铸态合金具有良好的导电性和导热性。而且，系统研究了高温下的氧化行为，与市售钢和合金相比，显示出令人惊讶的良好抗氧化性能。氧化活性能量为 259.3740 kJ/mol，范围为 1173 至 1273 K。主要的氧化物是 Al 2 O 3 、Cr 2 O 3 和 FeCr 2 O 4 并进一步讨论了氧化机制。该研究表明，FeCrNiAl 0.5 多组分合金在高温结构材料方面具有广阔的前景。