Microstructure Evolution in a New Refractory High-Entropy Alloy W-Mo-Cr-Ti-Al
Microstructure Evolution in a New Refractory High-Entropy Alloy W-Mo-Cr-Ti-Al
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DOI：
10.1007/s11661-015-3246-0
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发表时间：
2016-02
期刊：
影响因子：
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通讯作者：
B. Gorr;M. Azim;H. Christ;Hans Chen;D. Szabó;A. Kauffmann;M. Heilmaier
中科院分区：
文献类型：
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作者：
B. Gorr;M. Azim;H. Christ;Hans Chen;D. Szabó;A. Kauffmann;M. Heilmaier
研究了体心立方 20W-20Mo-20Cr-20Ti-20Al 合金在铸态下的显微组织及其在热处理过程中的显微组织演变。应用了不同的表征技术，例如聚焦离子束扫描电子显微镜、X射线衍射和透射电子显微镜。热力学计算支持了实验观察。该合金在铸态下表现出明显的枝晶微观结构，相应的枝晶和枝晶间区域显示出元素浓度的显着波动。使用热力学计算，可以合理化枝晶和枝晶间区域中测量的元素分布。对微观结构演化的观察表明，在热处理过程中，发生了显着的均匀化，导致单相微观结构的形成。从热力学的角度讨论了微观结构演化的驱动力。
The microstructure of a body-centered cubic 20W-20Mo-20Cr-20Ti-20Al alloy in the as-cast condition as well as its microstructural evolution during heat treatment was investigated. Different characterization techniques, such as focused ion beam-scanning electron microscope, X-ray diffraction, and transmission electron microscope, were applied. Experimental observations were supported by thermodynamic calculations. The alloy exhibits a pronounced dendritic microstructure in the as-cast condition with the respective dendritic and interdendritic regions showing significant fluctuations of the element concentrations. Using thermodynamic calculations, it was possible to rationalize the measured element distribution in the dendritic and the interdendritic regions. Observations of the microstructure evolution reveal that during heat treatment, substantial homogenization takes place leading to the formation of a single-phase microstructure. Driving forces for the microstructural evolution were discussed from a thermodynamic point of view.