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

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

14 Scopus Citations
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Author(s)

  • Zhifeng Lei
  • Dehong Yu
  • Zhaoping Lu
  • Suresh M. Chathoth

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)44-47
Number of pages4
Journal / PublicationJournal of Materials Science and Technology
Volume35
Issue number1
Online published15 Sept 2018
Publication statusPublished - Jan 2019

Abstract

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 Å diffuses collectively even well above the melting temperature. However, the temperature dependence of the diffusion process in one of the HE-GFM liquid is Arrhenius, but in the other HE-GFM liquid 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.

Research Area(s)

  • Atomic relaxation, Diffusion, High-entropy alloy, Neutron scattering