Microstructure of a near-equimolar refractory high-entropy alloy
Microstructure of a near-equimolar refractory high-entropy alloy
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DOI：
10.1016/j.matlet.2014.04.062
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发表时间：
2014-07-01
影响因子：
3
通讯作者：
Guillot, I.
中科院分区：
文献类型：
--
作者：
Couzinie, J. P.;Dirras, G.;Guillot, I.
采用电弧熔化和感应技术研究了一种有前途的含有 Ti、Zr、Hf、Nb 和 Ta 的等摩尔耐火高熵合金的微观结构。高熵合金呈现出完全无序的bcc晶体结构。在纳米尺度上，观察到的位错主要出现在固溶体的亚晶界中。在细观层面上，随着冷却速率的变化，凝固的显微组织是不同的：合金呈现枝晶结构，在冷却最慢的部件的枝晶间区域存在富Ti、Zr和Hf的微观偏析，而在冷却速率剧烈的区域则完全均匀化。 (C) 2014 Elsevier B.V. 保留所有权利。
The microstructure of a promising equimolar refractory high-entropy alloy containing Ti, Zr, Hf, Nb and Ta has been investigated after arc melting and induction techniques. The high-entropy alloy displays a fully disordered bcc crystal structure. At the nanoscopic scale, the observed dislocations appear mainly patterned in sub-grain boundaries in the solid solution. At the mesoscopic level and following the cooling rate, the solidified microstructure is different: the alloy exhibits a dendritic structure with the presence of Ti, Zr and Hf-rich microsegregations in the interdendritic zones for the slowest cooled parts, whereas it is fully homogenized in the regions for which the cooling rate is intense. (C) 2014 Elsevier B.V. All rights reserved.