Microstructure of high entropy alloy: CoCuFeNi

ORAL

Abstract

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 these\textit{ 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.

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Authors

  • Phil Sprunger

    Department of Physics, Louisiana State University, Department of Physics and Astronomy, Louisiana State University, Louisiana State Univ - Baton Rouge, Louisiana State University

  • David Plaisance

    Louisiana Tech University

  • Boliang Zhang

    Department of Mechanical and Industrial Engineering, Louisiana State Univ - Baton Rouge, Louisiana State University

  • Amitava Roy

    Center for Advanced Microstructures and Devices, Louisiana State University

  • Shengmin Guo

    Department of Mechanical and Industrial Engineering, Louisiana State Univ - Baton Rouge, Louisiana State University, Department of Mechanical and Industrial Engineering, Louisiana State University, Baton Rouge, LA 70803