Highly collective atomic transport mechanism in high-entropy glass-forming metallic liquids
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2019年第1期
论文作者：Changjiu Chen Kaikin Wong Rithin P.Krishnan Lei Zhifeng Dehong Yu Zhaoping Lu Suresh M.Chathoth
文章页码：44 - 47
摘 要：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 ? 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.
Changjiu Chen1，Kaikin Wong1，Rithin P.Krishnan1，Lei Zhifeng2，Dehong Yu3，Zhaoping Lu2，Suresh M.Chathoth1
1. Department of Physics, City University of Hong Kong2. State Key Laboratory for Advanced Metals and Materials, University of Science and Technology,Beijing3. Australian Nuclear Science and Technology Organization
摘 要：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 ? 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.
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