Fundamental Link between β Relaxation, Excess Wings, and Cage-Breaking in Metallic Glasses

Hai Bin Yu, Meng Hao Yang, Yang Sun, Feng Zhang, Jian Bo Liu, C. Z. Wang, K. M. Ho, Ranko Richert, Konrad Samwer

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In glassy materials, the Johari-Goldstein secondary (β) relaxation is crucial to many properties as it is directly related to local atomic motions. However, a long-standing puzzle remains elusive: why some glasses exhibit β relaxations as pronounced peaks while others present as unobvious excess wings? Using microsecond atomistic simulation of two model metallic glasses (MGs), we demonstrate that such a difference is associated with the number of string-like collective atomic jumps. Relative to that of excess wings, we find that MGs having pronounced β relaxations contain larger numbers of such jumps. Structurally, they are promoted by the higher tendency of cage-breaking events of their neighbors. Our results provide atomistic insights for different signatures of the β relaxation that could be helpful for understanding the low-temperature dynamics and properties of MGs.

Original languageEnglish (US)
Pages (from-to)5877-5883
Number of pages7
JournalJournal of Physical Chemistry Letters
Volume9
Issue number19
DOIs
StatePublished - Oct 4 2018

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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