Magnus Hörnqvist Colliander, Dörthe Haase, Konstantin Glazyrin, Aina Edgren, Pan Wang, Malcolm Guthrie, Sheng Guo
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引用次数: 0
Abstract
Pressure-induced polymorphism has recently been demonstrated in several high entropy alloys. This offers a new window into the much-debated issue of phase selection and stability in these systems. Here, we examine the effect of cryogenic temperatures on the pressure-induced transition from face centered cubic to hexagonal close-packed structures of the prototype CoCrFeMnNi (Cantor) alloy. We observe a reduction in the critical pressure for the onset of the polymorphic transition as the temperature decreases, confirming the progressive stabilization of the hexagonal phase with decreasing temperature previously predicted by ab initio calculations accounting for magnetic interactions. We argue that in situ high-pressure experiments at cryogenic temperatures, which suppress time-dependent transformation triggered at higher temperatures, present a unique opportunity to significantly improve our understanding of these complex alloys.
最近在几种高熵合金中证实了压力诱导的多态性。这为研究这些系统中备受争议的相选择和稳定性问题提供了一个新的视角。在这里,我们研究了低温对钴铬铁镍(Cantor)合金原型从面心立方到六方紧密堆积结构的压力诱导转变的影响。我们观察到,随着温度的降低,多晶体转变开始的临界压力也随之降低,这证实了之前通过考虑磁相互作用的 ab initio 计算所预测的六方相随温度降低而逐渐稳定的现象。我们认为,低温下的原位高压实验抑制了在较高温度下引发的随时间变化的转变,为我们显著提高对这些复杂合金的认识提供了一个独特的机会。
期刊介绍:
The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research.
Topics covered in JAP are diverse and reflect the most current applied physics research, including:
Dielectrics, ferroelectrics, and multiferroics-
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Organic-Inorganic systems, including organic electronics-
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Physics of semiconductors-
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Thin films, interfaces, and surfaces