Abstract

In the present work, a simple approach is proposed for predicting the compositions of eutectic high entropy alloys (EHEAs) in Al–Co–Cr–Fe–Ni system. It is proposed that eutectic lines exist between certain eutectic alloys in this system and, as a result, new eutectic or near-eutectic compositions can be obtained by mixing the alloys which are located on the same eutectic line. The approach is applied for a series of experimentally verified eutectic alloys and new eutectic or near-eutectic alloys are designed for Al–Co–Cr–Fe–Ni system. Furthermore, by investigating the compositions of verified eutectic alloys in Al–Co–Cr–Fe–Ni system, compositional maps are proposed which show the relations between the concentrations of constituent elements in eutectic alloys. The compositional maps suggest that EHEAs are derived from binary and ternary eutectic alloys. Moreover, the proposed diagrams can be considered as convenient methods for evaluating the composition of EHEAs in Al–Co–Cr–Fe–Ni system.

Graphic Abstract

摘要

在目前的工作中，提出了一种简单的方法来预测Al-Co-Cr-Fe-Ni系统中的共晶高熵合金（EHEAs）的成分。建议在该系统中某些共晶合金之间存在共晶线，结果，通过混合位于同一共晶线上的合金，可以获得新的共晶或近共晶组成。该方法适用于一系列经过实验验证的低共熔合金，并且为Al-Co-Cr-Fe-Ni系统设计了新的低共熔或近共熔合金。此外，通过研究经验证的Al-Co-Cr-Fe-Ni体系中的低共熔合金的成分，提出了组成图，该图显示了低共熔合金中各组成元素的浓度之间的关系。成分图表明，EHEA衍生自二元和三元共晶合金。此外，所提出的图表可被视为评估Al-Co-Cr-Fe-Ni系统中EHEAs组成的便捷方法。

图形摘要