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Orientational high-entropy alloys

机译:定向高熵合金

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摘要

In high-entropy alloys (HEA), the configurational entropy arising from the presence of multiple elements, stabilizes a disordered solid solution in preference to the possible formation of compounds. In the current work, we identify cluster compounds (of the type AM(4)X(8)) as orientational analogues of HEA (as a first report on orientational high-entropy systems). In cluster compounds, orientational disorder increases the entropy and plays a role analogous to positional disorder in HEA. In the GaMo4S8 compound, at temperatures greater than 50K, the entropic benefit more than makes up for the strain energy cost and stabilizes the disordered phase in preference to an orientationally ordered compound.
机译:在高熵合金(HEA)中,由于存在多种元素而产生的构型熵优先于可能形成化合物的情况下稳定了无序固溶体。在当前的工作中,我们确定簇化合物(类型为AM(4)X(8))作为HEA的取向类似物(关于取向高熵系统的第一个报告)。在簇状化合物中,定向障碍会增加熵并起到类似于HEA中位置障碍的作用。在GaMo4S8化合物中,在高于50K的温度下,熵的好处比弥补应变能成本要多,并且比取向有序的化合物更能稳定无序相。

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