Abstract
Extended X-ray absorption fine structure (EXAFS) and neutron diffraction experiments were carried out to clarify the typical features of the local structure of a family of medium-entropy alloys (CrCoNi, MnCoNi, and FeCoNi). A simple random cluster model was constructed for analyzing EXAFS spectra, and static and dynamic components of the mean-square relative displacement (MSRD) were separately extracted. In our analysis, the static MSRD of the MnCoNi sample was slightly larger than those of the CrCoNi and FeCoNi samples, whereas the dynamic MSRDs of these samples were almost identical. Based on the complementary neutron diffraction data, we argued that the origin of the large static displacement in the MnCoNi alloy can be associated with a short-range structural transformation through long-term structural relaxation.
| Original language | English |
|---|---|
| Pages (from-to) | 2254-2260 |
| Number of pages | 7 |
| Journal | Materials Transactions |
| Volume | 64 |
| Issue number | 9 |
| DOIs | |
| State | Published - 2023 |
| Externally published | Yes |
Funding
One of the authors (YI) thanks Dr. M. Enoki and Prof. H. Ohtani for their helpful advice. We also thank Mr. M. Ohkawara and Assoc. Prof. Y. Nambu for their kind support in the neutron diffraction experiments at T1-3 HERMES. This work was supported by Grants-in-Aid for Scientific Research on Innovative Areas on High Entropy Alloys (grant numbers JP19H05164 and JP21H00139). We wish to thank the Analytical Research Core for Advanced Materials at the Institute for Materials Research, Tohoku University for the experimental support in the chemical composition analysis with the XRF spectrometer. EXAFS experiments were carried out at the BL14B1 beamline of SPring-8 (Proposal No. 2020A-E03, JPMXP09A20AE0003, JASRI-2020A3647) with the support of the “Nanotechnology Platform” of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan and the approval of the Japan Synchrotron Radiation Research Institute (JASRI). The neutron diffraction experiments were performed under the Joint-Use Research Program for Neutron Scattering, Institute for Solid State Physics (ISSP), University of Tokyo, at the Japan Research Reactor JRR-3 (Proposal No. 21576). We gratefully acknowledge the support from the Center of Neutron Science for Advanced Materials, Institute for Materials Research, Tohoku University.
Keywords
- extended X-ray absorption fine structure spectroscopy
- local structure
- medium-entropy alloy
- neutron diffraction
- short-range order
- structural relaxation
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