Tensile plasticity in metallic glasses with pronounced β relaxations.

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Output type: Journal article

Author list: Yu, Shen, Wang, Gu, Wang, Bai

Publisher: American Physical Society

Publication year: 2012

Volume number: 108

Issue number: 1

ISSN: 0031-9007

eISSN: 1079-7114

Languages: English-Great Britain (EN-GB)

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Open access status: closed

Abstract

Metallic glasses are commonly brittle, as they generally fail catastrophically under uniaxial tension. Here we show pronounced macroscopic tensile plasticity achieved in a La-based metallic glass which possesses strong β relaxations and nanoscale heterogeneous structures. We demonstrate that the β relaxation is closely correlated with the activation of the structural units of plastic deformations and global plasticity, and the transition from brittle to ductile in tension and the activation of the β relaxations follow a similar time-temperature scaling relationship. The results have implications for understanding the mechanisms of plastic deformation and structural origin of β relaxations as well as for solving the brittleness in metallic glasses.

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