Origin of Ultrafast Ag Radiotracer Diffusion in Shear Bands of Deformed Bulk Metallic Glass Pd40Ni40P20

TL;DR

This study quantitatively explains the colossal Ag radiotracer diffusion enhancement in shear bands of deformed bulk metallic glass Pd40Ni40P20 using the Coupling Model, aligning with experimental data.

Contribution

It introduces a quantitative calculation of diffusion enhancement in shear bands, resolving previous qualitative limitations using the Coupling Model.

Findings

Maximum diffusion enhancement can reach 8-10 orders of magnitude.

Calculated enhancement aligns with experimental observations.

Provides a quantitative framework for understanding diffusion in shear bands.

Abstract

Measurements of Ag radiotracer diffusion in shear bands of deformed bulk metallic glass, Pd40Ni40P20, [Joachim Bokeloh, Sergiy V. Divinski, Gerrit Reglitz, and Gerhard Wilde, Phys. Rev. Lett. 107, 235503 (2011).] have found a colossal enhancement of diffusion coefficient by more than eight orders of magnitude than in undeformed Pd40Ni40P20. Suggestion was made by Bokeloh et al. that enhanced diffusion occurs in high-mobility pathways originating from some excess free volume distribution inside the shear bands. Although plausible, this qualitative suggestion does not allow quantitative calculation of the enhancement. The impasse is avoided by using the Coupling Model to calculate the maximum of the enhancement of diffusivity possible in high-mobility pathways of the shear bands. Within the range of eight to ten orders of magnitude, the calculated maximum enhancement is capable to account for the experimental observation.