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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The elastic properties of hcp-Fe alloys under the conditions of the Earth's inner core
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The elastic properties of hcp-Fe alloys under the conditions of the Earth's inner core

机译：地球内核条件下HCP-Fe合金的弹性性能

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Geophysical and cosmochemical constraints suggest the inner-core is mainly composed of iron with a few percent of light elements. However, despite extensive studies over many years, no single alloying light-element has been found that is able to simultaneously match the observed inner-core density and both seismic velocities. This has motivated a number of suggestions of other mechanism to lower velocities, such as anelasticity or premelting. However, an unexplored possibility is that a combination of two or more light-elements might produce the desired reduction in velocities and densities of the inner core. In order to test this, we use ab initio molecular dynamics calculations to map the elastic property space of hcp-Fe alloyed with S, Si and C at 360 GPa up to the melting temperature. Based on a mixing solid solution model together with direct simulations on the ternaries, we found a number of compositions which are able to match the observed properties of the inner core. This is the first time that the density, V-p, V-s and the Poisson's ratio of the inner core have been matched directly with an hcp-Fe alloy. (C) 2018 The Author(s). Published by Elsevier B.V.
机译：地球物理和宇宙化学约束建议内核主要由铁具有少量轻质元素。然而，尽管多年来存在广泛的研究，但没有发现单一合金化光元素能够同时匹配观察到的内核密度和地震速度。这使得许多建议其他机制到更低的速度，例如四组织或头部。然而，未探测的可能性是两个或更多个轻质元件的组合可以产生内芯的速度和密度的所需降低。为了测试这一点，我们使用AB Initio分子动力学计算，将HCP-Fe的弹性性能与S，Si和C合金的弹性特性计算在360GPA上达到熔融温度。基于与三龙区的直接模拟一起的混合固溶体模型，我们发现了许多能够匹配内芯的观察性质的组合物。这是密度，V-P，V-S和内核的泊松比第一次直接与HCP-Fe合金相匹配。 （c）2018年作者。由elsevier b.v出版。

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