对CrMnFeCoNi高合金的氧化机制的热力学见解,使用in situX射线衍射
Muhammad Arshad1, Saira Bano2, Mohamed Amer1
1Centre for Manufacturing and Materials, Coventry University, Coventry CV1 5FB, UK.
Materials (Basel, Switzerland)
|July 29, 2023
概括
在高温氧化过程中, (Mn) 在CrMnFeCoNi高合金 (HEAs) 中形成非保护性氧化物. 在现场X射线衍射 (XRD) 是研究HEA氧化机制的强大工具.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 物理化学 物理化学
背景情况:
- 高合金 (HEAs) 由于其复杂的组成,具有独特的特性.
- 了解高温高的氧化行为对于它们的应用至关重要.
- 之前对CrMnFeCoNi HEA氧化的研究已经产生了不同的结果.
研究的目的:
- 为了研究CrMnFeCoNi HEA的高温氧化行为.
- 为了识别在不同环境中氧化过程中形成的氧化物相.
- 将实验结果与热力学预测进行比较.
主要方法:
- 在高温下进行现场X射线衍射 (XRD).
- 在真空和空气环境中的氧化实验.
- 使用ThermoCalc (CALPHAD方法) 的热力学计算.
主要成果:
- (Mn) 被确定为形成非保护性氧化物的主要元素,耗尽了散装合金.
- 观察到的氧化物与之前的一些报道相矛盾,没有Cr2O3,Fe2O3或Fe3O4的形成.
- 热力学计算预测了螺旋体和化物氧化物,突出了与大气条件下的实验结果的差异.
结论:
- 在现场HTXRD对于研究HEA氧化过程中的时间-温度依赖相位转换是有效的.
- 这项研究提供了关于CrMnFeCoNi HEA.氧化机制的见解.
- 需要进一步的研究来协调热力学预测与实验观测.
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