Localized crystallization in shear bands of a metallic glass.

Abstract:

:Stress-induced viscous flow is the characteristic of atomic movements during plastic deformation of metallic glasses in the absence of substantial temperature increase, which suggests that stress state plays an important role in mechanically induced crystallization in a metallic glass. However, it is poorly understood. Here, we report on the stress-induced localized crystallization in individual shear bands of Zr60Al15Ni25 metallic glass subjected to cold rolling. We find that crystallization in individual shear bands preferentially occurs in the regions neighboring the amorphous matrix, where the materials are subjected to compressive stresses demonstrated by our finite element simulations. Our results provide direct evidence that the mechanically induced crystallization kinetics is closely related with the stress state. The crystallization kinetics under compressive and tensile stresses are interpreted within the frameworks of potential energy landscape and classical nucleation theory, which reduces the role of stress state in mechanically induced crystallization in a metallic glass.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Yan Z,Song K,Hu Y,Dai F,Chu Z,Eckert J

doi

10.1038/srep19358

subject

Has Abstract

pub_date

2016-01-13 00:00:00

pages

19358

issn

2045-2322

pii

srep19358

journal_volume

6

pub_type

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