Anomalous fast atomic dynamics in bulk metallic glasses

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

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Author(s)

  • Tianding Xu
  • Xiao-Dong Wang
  • Eric M. Dufresne
  • Qingping Cao
  • Dongxian Zhang
  • Jian-Zhong Jiang

Detail(s)

Original languageEnglish
Article number100351
Journal / PublicationMaterials Today Physics
Volume17
Online published19 Jan 2021
Publication statusPublished - Mar 2021
Externally publishedYes

Abstract

It is commonly believed that the strong glass formers tend to be dense packing and have rather slow atomic dynamics. Here, we report that the anomalous fast atomic dynamics exist in an Au55Cu20Ag5Si20 metallic glass (MG) with good glass forming ability (GFA) by combining X-ray photon correlation spectroscopy measurements with ab initio molecular dynamics simulations. The fast dynamics are mainly originated from the increased mobility of Cu atoms by Ag addition. Ag atoms are inclined to locate at Cu-centered <0, 2, 8, 1> motifs, which slow or accelerate the dynamics of shell Cu atoms, depending on whether Ag atoms appear at the first shells or not, leading to the formation of structural heterogeneity at the atomic level. The results enrich the understanding of atomic dynamics in Cu–Ag-containing MGs and will trigger more studies on the dynamics-GFA relationship in MGs.

Research Area(s)

  • Atomic dynamics, Glass forming ability, Metallic glass, X-ray photon correlation spectroscopy

Citation Format(s)

Anomalous fast atomic dynamics in bulk metallic glasses. / Xu, Tianding; Wang, Xiao-Dong; Dufresne, Eric M. et al.
In: Materials Today Physics, Vol. 17, 100351, 03.2021.

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