期刊
SCRIPTA MATERIALIA
卷 144, 期 -, 页码 64-68出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2017.09.049
关键词
High-entropy alloys; Chemical short-range order; Cluster structural model; Neutron scattering; Structural transition
类别
资金
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- National Key Research and Development Plans [2017YFB0702400, 2017YFB0306100]
- International Thermonuclear Experimental Reactor (ITER) Program of China [2015GB121004]
- Science Challenge Project [TZ2016004]
- International Science & Technology Cooperation Program of China [2015DFR60370]
- Department of Energy (DOE), Office of Fossil Energy, National Energy Technology Laboratory [DE-FE-0008855, DE-FE-0024054, DE-FE-0011194]
- U.S. Army Research Office project [W911NF-13-1-0438]
- National Science Foundation [DMR-1611180]
- QuesTek Innovations LLC [DE-SC0013220]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1611180] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0013220] Funding Source: U.S. Department of Energy (DOE)
The present work verifies the existence of chemical short-range orders (CSROs) in high-entropy alloys (HEAs) using a cluster-plus-glue-atom model. Two HEAs with a composition of Al2M14 (M = Ni4Co4Fe3Cr3 or Ni1Co1Fe2Cr1) are designed, which is derived from the cluster model of [Al-M-12](M2Al1) in face-centered-cubic structure or [Al-M-14]Al-1 in body-centered-cubic structure. It is found that the calculated pair-distribution functions (PDFs) at short inter-atomic distances by these cluster models can describe the neutron PDFs better than the ones by the average crystal structures. It is due to the different CSROs characterized by cluster units that induce the structural transition of HEAs. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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