Thermodynamic Insights into the Oxidation Mechanisms of CrMnFeCoNi High-Entropy Alloy Using In Situ X-ray Diffraction.
Thermodynamic Insights into the Oxidation Mechanisms of CrMnFeCoNi High-Entropy Alloy Using In Situ X-ray Diffraction.
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DOI：
10.3390/ma16145042
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发表时间：
2023-07-17
期刊：
影响因子：
3.4
通讯作者：
Bai, Mingwen
中科院分区：
文献类型：
--
作者：
Arshad, Muhammad;Bano, Saira;Amer, Mohamed;Janik, Vit;Hayat, Qamar;Huang, Yuze;Guan, Dikai;Bai, Mingwen
利用原位X射线衍射（XRD）研究了CrMnFeCoNi高熵合金（HEA）的高温氧化行为。我们发现：（1）Mn是主要的氧化物形成元素在真空和空气环境中，导致非保护性氧化物的形成，耗尽的块体合金的Mn;（2）没有氧化物，如Cr2 O3，Fe 2 O3，或Fe 3 O 4观察到在高温氧化行为的CrMnFeCoNi，这与一些以前的研究相矛盾的等温氧化的CrMnFeCoNi HEA。采用ThermoCalc 2022 b软件，采用CALPHAD方法，对实验结果与热力学计算结果进行了分析比较。ThermoCalc预测了真空环境中的尖晶石氧化物，沿着实验结果中观察到的岩盐氧化物;此外，在大气环境中，它仅预测了尖晶石，表明需要进一步研究因素以验证热力学预测。我们的研究表明，在原位HTXRD技术是一个强大的工具，准确地识别时间-温度依赖的相形成/转变的研究氧化行为和理解的HEAs的氧化机制。
This paper utilizes in situ X-ray diffraction (XRD) to investigate the high-temperature oxidation behaviour of CrMnFeCoNi high-entropy alloy (HEA). We found that (1) Mn is the major oxide-forming element in both vacuum and air environments, leading to the formation of non-protective oxides that deplete the bulk alloy of Mn; (2) no oxides like Cr2O3, Fe2O3, or Fe3O4 were observed during the high-temperature oxidation behaviour of CrMnFeCoNi, which contradicts some previous studies on the isothermal oxidation of CrMnFeCoNi HEA. We also analysed and compared the experimental results with thermodynamic calculations by using ThermoCalc version 2022b software following the CALPHAD method. ThermoCalc predicted spinel oxide in a vacuum environment, along with halite oxides observed in experimental results; also, in an atmospheric environment, it predicted only spinel, indicating the need for further investigation into factors to validate the thermodynamic predictions. Our study shows that the in situ HTXRD technique is a powerful tool to accurately identify time–temperature-dependent phase formation/transformation for studying oxidation behaviours and understanding oxidation mechanisms in HEAs.
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