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Tailoring plasticity of metallic glasses via interfaces in Cu/amorphous CuNb laminates

Published online by Cambridge University Press:  13 July 2017

Zhe Fan
Affiliation:
Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
Qiang Li
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Jin Li
Affiliation:
Department of Materials Science & Engineering, Texas A&M University, College Station, Texas 77843-3003, USA
Sichuang Xue
Affiliation:
Department of Mechanical Engineering, Texas A&M University, College Station, Texas 77843-3123, USA
Haiyan Wang
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA; and School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Xinghang Zhang
Affiliation:
School of Materials Engineering, Purdue University, West Lafayette, Indiana 47907, USA
Corresponding
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Abstract

Metallic glasses (MGs) are known to have high strength, but poor ductility. Prior studies have shown that plasticity in MG can be enhanced by significantly reducing their dimension to nanoscale. Here we show that, via the introduction of certain types of crystalline/amorphous interfaces, plasticity of MG can be prominently enhanced as manifested by the formation of ductile “dimples” in a 2 μm thick amorphous CuNb film. By tailoring the volume fraction and architecture of crystalline/amorphous multilayers, tensile fracture surface of MG can evolve from brittle featureless morphology to containing ductile dimples. In situ micropillar compression studies performed inside a scanning electron microscope show that shear instability in amorphous layers can be inhibited by interfaces. The mechanisms for improving plasticity and fracture resistance of MG via interface and size effect are discussed.

Type
Invited Papers
Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

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