Relating activation of shear transformation zones to β relaxations in metallic glasses
2010; American Physical Society; Volume: 81; Issue: 22 Linguagem: Inglês
10.1103/physrevb.81.220201
ISSN1550-235X
AutoresHai‐Bin Yu, W. H. Wang, H. Y. Bai, Yue Wu, Mingwei Chen,
Tópico(s)Theoretical and Computational Physics
ResumoThe mechanisms of plastic deformation of glassy solids and structural origin of $\ensuremath{\beta}$ relaxation are two fundamental issues. We provide compelling experimental evidence that the activation of shear transformation zones (STZs) and $\ensuremath{\beta}$ relaxations in metallic glasses are directly related, and the activation energy of the $\ensuremath{\beta}$ relaxation and the potential-energy barriers of STZs are nearly equivalent. Our results suggest an intrinsic correlation among potential STZs, $\ensuremath{\beta}$ relaxation, and the inhomogeneous atomic structure of metallic glasses, which has implications for understanding the deformation mechanism and structural origin of $\ensuremath{\beta}$ relaxation in glasses.
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