Chemical short-range orders and the induced structural transition in high-entropy alloys

SCRIPTA MATERIALIA

卷:144

Article

Ma, Yue¹  Wang, Qing¹  Li, Chunling¹  Santodonato, Louis J.²  Feygenson, Mikhail^2,3  Dong, Chuang¹  Liaw, Peter K.⁴ 

[1] Dalian Univ Technol, Sch Mat Sci & Engn, Key Lab Mat Modificat Laser Ion & Electron Beams, Minist Educ, Dalian 116024, Peoples R China

[2] Oak Ridge Natl Lab, Chem & Engn Mat Div, Oak Ridge, TN 37831 USA

[3] Forschungszentrum Julich, Julich Ctr Neutron Sci, D-52428 Julich, Germany

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

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

DOI  :  10.1016/j.scriptamat.2017.09.049

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

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