Influence of short- to medium-range electronic and atomic structure on secondary relaxations in metallic glasses

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • B. Huang
  • C.C. Yuan
  • Z.Q. Wang
  • Y. Tong
  • Q. Wang
  • J. Yi
  • G. Wang

Detail(s)

Original languageEnglish
Pages (from-to)88-100
Journal / PublicationActa Materialia
Volume196
Online published12 Jun 2020
Publication statusPublished - 1 Sep 2020

Abstract

Unusual secondary relaxations were revealed in metallic glasses (MGs) recently. In this paper, we explore the structural origins of secondary relaxations in La-based MGs alloyed with different species of elements. With the combination of synchrotron X-ray diffraction and ab initio molecular dynamics simulations, solute-atom-centered clusters with a string-like type of medium-range order are found in the MGs, the formation of which leaves dispersed low-electron-density regions. It is found the activation energy of fast secondary relaxation increases with the reduction of low-electron-density regions, while slow secondary relaxation relates to the distance of La in next nearest La-La atomic pairs and the size of the string-like solute-atom-centered clusters. The phenomena are interpreted within the framework of the generalized Maxell model and free volume model. Our results demonstrate fast secondary relaxation as the activation of a small concentration of liquid-like regions with extremely low viscosities preceding slow secondary relaxation, and provide evidence for the correlation of secondary relaxations with short- to medium-range electronic and atomic structure in MGs.

Research Area(s)

  • Atomic cluster, Low-electron-density region, Metallic glass, Secondary relaxation, Synchrotron X-ray diffraction

Citation Format(s)

Influence of short- to medium-range electronic and atomic structure on secondary relaxations in metallic glasses. / Huang, B.; Yuan, C.C.; Wang, Z.Q.; Tong, Y.; Wang, Q.; Yi, J.; Wang, G.; He, Q.F.; Shek, C.H.; Yang, Y.

In: Acta Materialia, Vol. 196, 01.09.2020, p. 88-100.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal