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Melt separation phenomena in CoNiCuAlCr high entropy alloy containing silver

机译：含银CoNiCuAlCr高熵合金中的熔体分离现象

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摘要

The effects of Ag additions to AlCoCrCuNi or AlCoCrCuFeNi high entropy (HE) alloys are described. It is shown that Ag additions to these HE alloys results in liquid phase separation (LPS) into two melts, namely, an AlCoCr(Fe) rich liquid (L1) and a second liquid enriched in Ag and Cu (L2). Further, since the L2 has a higher density and a lower melting temperature, it tends to flow to the bottom of the arc melted buttons due to liquid flow (a) along the outer surface of the unmelted L1 and (b) through the interdendritic channels. In addition to the primary macroscopic LPS, secondary (within the different primary liquids) melt separation was observed in the two melts: the upper L1 layer contained L2 spheres which tended to sink to the fusion line while the L2 melt layer found at the bottom of the buttons contained L1 spheres which tended to float to the top of the L2 layer. The L1 microstructure and microhardness resembles that of an Ag-free AlCoCrCuFeNi HE alloy. In spite of the melt separation, relatively simple microstructures were obtained from the two different liquids; these are described in light of the current understanding of this class of alloys. Finally, the possibility of metastable LPS in a Cu-rich HE alloy using electron beam surface melting, which is known to produce significant dynamic undercoolings on the order of 150℃, was investigated but was not observed.
机译：描述了向AlCoCrCuNi或AlCoCrCuFeNi高熵（HE）合金中添加Ag的影响。结果表明，向这些HE合金中添加银会导致液相分离（LPS）分为两个熔体，即富含AlCoCr（Fe）的液体（L1）和富含银和铜的第二种液体（L2）。此外，由于L2具有较高的密度和较低的熔化温度，由于液体（a）沿着未熔化的L1的外表面和（b）通过枝状晶间通道流动，所以它倾向于流到电弧熔化的按钮的底部。 。除了主要的宏观LPS之外，在两个熔体中还观察到了次要的熔体分离（在不同的主要液体中）：上层L1层包含L2球体，这些球体倾向于沉入熔合线，而L2熔体层位于熔体底部按钮包含L1球体，这些球体倾向于漂浮到L2层的顶部。 L1的显微组织和显微硬度类似于不含银的AlCoCrCuFeNi HE合金。尽管进行了熔体分离，但从两种不同的液体中却获得了相对简单的微观结构。根据目前对此类合金的理解来描述这些。最后，研究了使用电子束表面熔化在富铜高合金中亚稳态LPS的可能性，已知该现象会产生明显的动态过冷，约为150℃，但没有观察到。

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  • 来源
    《Materials Science and Engineering》 |2013年第10期|633-642|共10页
  • 作者

    A. Munitz; M.J. Kaufman; J.P. Chandler; H. Kalaantari; R. Abbaschian;

  • 作者单位

    Nuclear Research Center-Negev, PO Box 9001, Beer-Sheva 841900, Israel;

    Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, USA;

    Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, USA;

    Department of Mechanical Engneering, University of California, Riverside, CA 92521, USA;

    College of Engineering, Department of Mechanical Engineering, University of California, Riverside, CA 92521, USA;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    liquid phase separation; high entropy alloys; solidification;

    机译：液相分离高熵合金;凝固;

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