Transition from a strong-yet-brittle to a stronger-and-ductile state by size reduction of metallic glasses

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Amorphous metallic alloys, or metallic glasses, are lucrative engineering materials owing to their superior mechanical properties such as high strength and large elastic strain. However, their main drawback is their propensity for highly catastrophic failure through rapid shear banding, significantly undercutting their structural applications. Here, we show that when reduced to 100 nm, Zr-based metallic glass nanopillars attain ceramic-ike strengths (2.25 GPa) and metal-like ductility (25%) simultaneously. We report separate and distinct critical sizes for maximum strength and for the brittle-to-ductile transition, thereby demonstrating that strength and ability to carry plasticity are decoupled at the nanoscale. A phenomenological model for size dependence and brittle-to-homogeneous deformation is provided.
Publisher
NATURE PUBLISHING GROUP
Issue Date
2010-03
Language
English
Article Type
Article
Keywords

MECHANICAL-PROPERTIES; TENSILE DUCTILITY; BULK; COMPRESSION; STRENGTH; ALLOYS; DEFORMATION; COMPOSITES; TOUGHNESS; DIAMETER

Citation

NATURE MATERIALS, v.9, no.3, pp.215 - 219

ISSN
1476-1122
DOI
10.1038/NMAT2622
URI
http://hdl.handle.net/10203/187281
Appears in Collection
NE-Journal Papers(저널논문)
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