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首页> 外文期刊>Bulletin of the American Physical Society >APS -APS March Meeting 2017 - Event - Microstructure of high entropy alloy: CoCuFeNi
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APS -APS March Meeting 2017 - Event - Microstructure of high entropy alloy: CoCuFeNi

机译：APS -APS三月会议2017-活动-高熵合金CoCuFeNi的微观结构

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摘要

The properties of CoCrFeNi powder alloy were prepared by ball milling methods were investigated and compared to arc melted samples. The electronic and microstructural properties of this high entropy alloy (HEA) were investigated via X-ray powder diffraction (XRD), as well as X-ray absorption near-edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) spectroscopy, X-ray and VUV photoemission (PES) spectroscopy. XRD reveals a single-phase fcc structure with a lattice constant consistent with previous studies from arc-melting preparation method. XANES reveals subtle changes in metallic edge structure compared to single-phase elemental samples. Moreover, in spite of EXAFS limited energy range of theseextit{ 3d} transition metals, generated $chi $(k) and corresponding Fourier transforms of this solid solution HEA alloy reveals that the nearest neighbor distances are nearly equal for all four elements (Co, Cr, Fe, and Ni), although subtle differences from bulk phase are observed. XPS and PES results of surface properties, and relevance to corrosion resistance, will also be presented.
机译：研究了通过球磨法制备的CoCrFeNi粉末合金的性能，并将其与电弧熔融样品进行了比较。通过X射线粉末衍射（XRD）以及X射线吸收近边缘结构（XANES）和扩展X射线吸收精细结构（EXAFS）研究了这种高熵合金（HEA）的电子和微观结构性质光谱，X射线和VUV光发射（PES）光谱。 XRD揭示了具有晶格常数的单相fcc结构，该结构与电弧熔化制备方法先前的研究一致。与单相元素样品相比，XANES揭示了金属边缘结构的细微变化。此外，尽管EXAFS限制了这些exext {3d}过渡金属的能量范围，但生成的$ chi $（k）以及该固溶HEA合金的相应傅里叶变换表明，所有四个元素的最接近邻居距离几乎相等（Co， Cr，Fe和Ni），尽管与本体相存在细微差异。也将介绍XPS和PES表面性能以及与耐腐蚀性相关的结果。

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