Microstructure and mechanical properties at elevated temperatures of a new Al-containing refractory high-entropy alloy Nb-Mo-Cr-Ti-Al
Microstructure and mechanical properties at elevated temperatures of a new Al-containing refractory high-entropy alloy Nb-Mo-Cr-Ti-Al
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DOI：
10.1016/j.jallcom.2015.11.050
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发表时间：
2016-03-15
影响因子：
6.2
通讯作者：
Heilmaier, M.
中科院分区：
文献类型：
--
作者：
Chen, H.;Kauffmann, A.;Heilmaier, M.
在本研究中，我们提供了一种新的含铝耐火高熵合金Nb-Mo-Cr-Ti-Al的铸造、均匀化和变形行为。该合金经电弧炉熔炼后呈树枝晶组织。树枝晶在1300℃热处理20h后完全溶解。X射线衍射(XRD)和背散射电子衍射(EBSD)分析表明，除主相为W原型结构的固溶体外，在晶内和晶界还观察到小体积分数的附加相。在室温和1200摄氏度之间进行的准静态压缩试验表明，高达800摄氏度的持久和高屈服强度以及随着试验温度的升高而增加的延展性。在800℃到1200℃之间的准静态压缩载荷的主要变形机制是固溶体内位错的铅笔滑动，这被相应的纤维织构成分所证实，在变形过程中演化。(C)2015爱思唯尔B.V.保留所有权利。
In the present investigation, we provide results on the casting, homogenization, and deformation behavior of a new Al-containing refractory high-entropy alloy, namely the equiatomic Nb-Mo-Cr-Ti-Al. The alloy shows a dendritic microstructure after arc melting. The dendrites completely dissolve due to a heat treatment at 1300 degrees C for 20 h. Besides a major phase in the form of a solid solution of W prototype structure, identified by X-ray diffraction (XRD) measurements as well as electron backscatter diffraction (EBSD), additional phases of small volume fraction within the grains and at the grain boundaries were observed. Quasistatic compression tests, performed between room temperature and 1200 degrees C, reveal sustaining and high yield strength up to 800 degrees C and an increasing ductility with increasing test temperature. The dominant deformation mechanism for quasistatic compression loading between 800 degrees C and 1200 degrees C is the < 111 > pencil glide of dislocations within the solid solution which was proven by the according fiber texture components, evolving during deformation. (C) 2015 Elsevier B.V. All rights reserved.