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Relationship between chemical and icosahedral local orderings in Al-Ni-Fe melts

机译:Al-Ni-Fe熔体中化学和二十面体局部有序关系

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摘要

An X-ray diffraction study and simulation of the structure of ternary Al_(81.6)Ni_(14.9)Fe_(3.5), Al_(71.6)Ni _(23)Fe_(5.4), and Al_(61.1)Ni_(31.1)Fe_(7.3) melts by the reverse Monte Carlo method are conducted. An analysis of the structural models of melts is performed by the Voronoi-Delaunay partition. It is shown that the prepeak on the structure factor curves in the diffraction vector range of 13 nm~(?1) to 22 nm~(?1) is due to two factors: chemical ordering of atoms and non-crystalline close packing. The origin of the icosahedral short-range order in the melts as one of the variants of ordering of atoms in non-crystalline close packed clusters is discussed.
机译:X射线衍射研究和三元Al_(81.6)Ni_(14.9)Fe_(3.5),Al_(71.6)Ni _(23)Fe_(5.4)和Al_(61.1)Ni_(31.1)Fe_的结构模拟(7.3)通过反向蒙特卡洛方法进行熔融。 Voronoi-Delaunay分区对熔体的结构模型进行了分析。结果表明,在衍射矢量范围13 nm〜(?1)至22 nm〜(?1)范围内,结构因子曲线的峰峰值是由两个因素引起的:原子的化学有序性和非晶态的紧密堆积。讨论了熔体中二十面体短程有序的起源,作为非晶态紧密堆积簇中原子有序化的变体之一。

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