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Dual HCP structures formed in senary ScYLaTiZrHf multi-principal-element alloy

机译：在ScYLaTiZrHf多元主要元素合金中形成的双重HCP结构

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A senary ScYLaTiZrHf alloy was investigated for its ability to form a solid solution with an hcp structure, also known as a high-entropy alloy (HEA). X-ray diffraction analysis of the ScYLaTiZrHf alloy produced by arc-melting method confirmed this hcp structure. The microstructure of the ScYLaTiZrHf was composed of dual phases that were enriched in (Y, La) or (Ti, Zr, Hf), with Sc distributed evenly across both phases. The positive mixing enthalpy of 11.4 kJ mol(-1) derived from Miedema's model, and the immiscible tendencies of its constituent binary phase diagrams help to explain the presence of dual phases in the ScYLaTiZrHf alloy. When formed into dual hcp solid solutions, the ScYLaTiZrHf alloy can be more accurately described as a multi-principal-element alloy (MPEA) rather than as a HEA, since the ScYLaTiZrHf alloy is a solid solution that is enthalpy-driven instead of entropy driven. The results also disclosed another procedure to stabilize solid solutions excepting for high-entropy scheme. (c) 2015 Elsevier Ltd. All rights reserved.
机译：研究了一种ScYLaTiZrHf合金，它能够形成具有hcp结构的固溶体，也被称为高熵合金（HEA）。通过电弧熔化法生产的ScYLaTiZrHf合金的X射线衍射分析证实了这种hcp结构。 ScYLaTiZrHf的微观结构由富含（Y，La）或（Ti，Zr，Hf）的双相组成，Sc均匀分布在两个相中。从Miedema模型得出的11.4 kJ mol（-1）的正混合焓及其组成二元相图的不混溶趋势有助于解释ScYLaTiZrHf合金中双相的存在。当形成双重hcp固溶体时，ScYLaTiZrHf合金可以更准确地描述为多主要元素合金（MPEA）而不是HEA，因为ScYLaTiZrHf合金是由焓驱动而不是由熵驱动的固溶体。结果还公开了除高熵方案外的另一种稳定固溶体的方法。 （c）2015 Elsevier Ltd.保留所有权利。

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