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Kim, Ju-Young
Robust Multifunctional Materials Lab
Research Interests
  • Flexible / stretchable devices, nano-mechanics, nanoporous metal, materials reliability

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Nanolaminates Utilizing Size-Dependent Homogeneous Plasticity of Metallic Glasses

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Title
Nanolaminates Utilizing Size-Dependent Homogeneous Plasticity of Metallic Glasses
Author
Kim, Ju-YoungJang, DongchanGreer, Julia R.
Keywords
Alternating layers; Catastrophic failures; Cu layers; High strength; High temperature; Localized plasticity; Maximum strength; Nano-laminates; Nanocrystalline Cu; Optimal composition; size-dependent deformation modes; Structural performance
Issue Date
201112
Publisher
WILEY-BLACKWELL
Citation
ADVANCED FUNCTIONAL MATERIALS, v.21, no.23, pp.4550 - 4554
Abstract
Homogeneous plasticity in metallic glasses is generally only observed at high temperatures or in very small structures (less than approximate to 100 nm), so their applications for structural performance have been very limited. Here, nanolaminates with alternating layers of Cu50Zr50 metallic glass and nanocrystalline Cu are synthesized and it is found that samples with an optimal composition of 112-nm-thick metallic-glass layers and 16-nm-thick Cu layers demonstrate a maximum strength of 2.513 GPa, a value 33% greater than that predicted by the rule-of-mixtures and 25% better than that of pure Cu50Zr50 metallic glass. Furthermore, approximate to 4% strain at fracture is achieved, suppressing the instantaneous catastrophic failure often associated with metallic glasses. It is postulated that this favorable combination of high strength and deformability is caused by the size-dependent deformation-mode transition in metallic glasses, from highly localized plasticity, leading to immediate failure in larger samples to homogeneous extension in the smaller ones.
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DOI
http://dx.doi.org/10.1002/adfm.201101164
ISSN
1616-301X
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