期刊
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
卷 35, 期 1, 页码 44-47出版社
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2018.09.008
关键词
High-entropy alloy; Neutron scattering; Atomic relaxation; Diffusion
资金
- City University of Hong Kong research grant [7004695]
Quasielastic neutron scattering (QENS) has been used to study the atomic relaxation process and microscopic transport mechanism in high-entropy glass-forming metallic (HE-GFM) liquids. Self-intermediate scattering functions obtained from the QENS data show unusually large stretching, which indicates highly heterogeneous atomic dynamics in HE-GFM liquids. In these liquids, a group of atoms over a length scale of about 21 angstrom diffuses collectively even well above the melting temperature. However, the temperature dependence of diffusion process in one of the HE-GFM liquid is Arrhenius, but in the other HE-GFM liquid it is non-Arrhenius. Although the glass-forming ability of these HE-GFM liquids is very poor, the diffusion coefficients obtained from the QENS data indicate the long range atomic transport process is much slower than that of the best metallic glass-forming liquids at their melting temperatures. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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