Highly collective atomic transport mechanism in high-entropy glass-forming metallic liquids

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（1）
• 页码范围: 44-47
• 页数: 4页
• 语种: 英文

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 (A) 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.