Presentation Information
[1E02]Element-selective local atomic configurations in Cantor high entropy alloy by x-ray fluorescence holography
*shinya hosokawa1, Naohisa Happo2, Koichi Hayashi3, Tomohiro Matsushita4, Satoshi Tsutsui5, Takeshi Teramoto6, Katsushi Tanaka6 (1. Shimane University, 2. Hiroshima City University, 3. Nagoya Institute of Technology, 4. Nara Institute of Science and Technology, 5. Japan Synchrotron Radiation Research Institute , 6. Kobe University)
Local atomic configurations on a typical high entropy alloy (HEA) with equiatomic quinary Cr-Mn-Fe-Co-Ni Cantor alloy having a fcc structure were investigated by element-selective X-ray fluorescence holography (XFH) technique. The obtained holographic data were analyzed using an inverse problem with a sparse modeling approach of an algorithm of L1-regularized regression. Although the atomic images exhibit clear fcc arrangements around all of the constituent elements, the intensities of neighboring atoms differ from each other, which would be due to positional fluctuations of neighboring atoms. Namely, the atomic images around Ni, which is originally fcc, Co, which is densely packed hcp, and Fe, which easily transforms from bcc to fcc with increasing temperature, are strong, whereas the intensities around Mn and Cr, which are stable bcc, is weak, and it is clear that the positional fluctuations of neighboring atoms around them are large.