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Indexed by:期刊论文

Date of Publication:2018-02-01

Journal:SCRIPTA MATERIALIA

Included Journals:SCIE、EI

Volume:144

Page Number:64-68

ISSN No.:1359-6462

Key Words:High-entropy alloys; Chemical short-range order; Cluster structural model; Neutron scattering; Structural transition

Abstract: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.