Tunable Tensile Ductility in Metallic Glasses

Widespread adoption of metallic glasses (MGs) in applications motivated by high strength and elasticity combined with plastic-like processing has been stymied by their lack of tensile ductility. One emerging strategy to couple the attractive properties of MGs with resistance to failure by shear loca...

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Bibliographic Details
Published in:Scientific reports 2013-01, Vol.3 (1), p.1096, Article 1096
Main Authors: Magagnosc, D. J., Ehrbar, R., Kumar, G., He, M. R., Schroers, J., Gianola, D. S.
Format: Article
Language:English
Subjects:
639/301/1023/218
639/301/119/1002
639/301/357/1016
639/925/357/537
Ductility
Humanities and Social Sciences
Irradiation
Localization
Microstructure
multidisciplinary
Nanotechnology
Plastics
Radiation
Science
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Summary:Widespread adoption of metallic glasses (MGs) in applications motivated by high strength and elasticity combined with plastic-like processing has been stymied by their lack of tensile ductility. One emerging strategy to couple the attractive properties of MGs with resistance to failure by shear localization is to employ sub-micron sample or feature length scales, although conflicting results shroud an atomistic understanding of the responsible mechanisms in uncertainty. Here, we report in situ deformation experiments of directly moulded Pt 57.5 Cu 14.7 Ni 5.3 P 22.5 MG nanowires, which show tunable tensile ductility. Initially brittle as-moulded nanowires can be coerced to a distinct glassy state upon irradiation with Ga + ions, leading to tensile ductility and quasi-homogeneous plastic flow. This behaviour is reversible and the glass returns to a brittle state upon subsequent annealing. Our results suggest a novel mechanism for homogenous plastic flow in nano-scaled MGs and strategies for circumventing the poor damage tolerance that has long plagued MGs.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep01096