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Controlled softening of Cu64Zr36 metallic glass by ion irradiation

Avchaciov, K. A. and Ritter, Y. and Djurabekova, F. and Nordlund, K. and Albe, K. (2013):
Controlled softening of Cu64Zr36 metallic glass by ion irradiation.
In: Applied Physics Letters, AIP Publishing LLC, p. 181910, 102, (18), ISSN 00036951,
[Online-Edition: http://dx.doi.org/10.1063/1.4804630],
[Article]

Abstract

We study the effect of irradiation with 5–20 keV recoils on the topological and chemical short-range order of Cu 64Zr36 metallic glass using molecular dynamics simulations. We show that within the cascade region, the structural backbone of stiff Cu-centered icosahedral units is destroyed, leading to locally softened areas. Under mechanical load, the formation of shear transformation zones is thus promoted in the damaged area. Our results suggest that irradiation is a means to introduce nucleation sites for multiple shear bands and thus prevents catastrophic failure due to the presence of a single critical shear band.

Item Type: Article
Erschienen: 2013
Creators: Avchaciov, K. A. and Ritter, Y. and Djurabekova, F. and Nordlund, K. and Albe, K.
Title: Controlled softening of Cu64Zr36 metallic glass by ion irradiation
Language: English
Abstract:

We study the effect of irradiation with 5–20 keV recoils on the topological and chemical short-range order of Cu 64Zr36 metallic glass using molecular dynamics simulations. We show that within the cascade region, the structural backbone of stiff Cu-centered icosahedral units is destroyed, leading to locally softened areas. Under mechanical load, the formation of shear transformation zones is thus promoted in the damaged area. Our results suggest that irradiation is a means to introduce nucleation sites for multiple shear bands and thus prevents catastrophic failure due to the presence of a single critical shear band.

Journal or Publication Title: Applied Physics Letters
Volume: 102
Number: 18
Publisher: AIP Publishing LLC
Uncontrolled Keywords: Ion radiation effects, Amorphous metals, Copper, Plasticity, Atom irradiation effects, Mechanical properties, Molecular dynamics, Short range order, Molecule irradiation effects, Nucleation
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Materials Modelling
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 28 Nov 2013 09:06
Official URL: http://dx.doi.org/10.1063/1.4804630
Identification Number: doi:10.1063/1.4804630
Funders: We acknowledge financial support from the National Graduate School in Materials Physics in Finland, the Academy of Finland, the DFG through Project No. AL-578/13 and a DAAD-PPP travel grant.
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