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Thermal and plastic behavior of nanoglasses

Published online by Cambridge University Press:  29 May 2014

Oliver Franke ,
Daniel Leisen ,
Herbert Gleiter  and
Horst Hahn
Oliver Franke*
Affiliation:
Department of Aerospace and Mechanical Engineering and The Mork Family Department for Chemical Engineering and Materials Science, University of Southern California, Los Angeles, California 90089
Daniel Leisen
Affiliation:
Institute for Applied Materials, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
Herbert Gleiter
Affiliation:
Herbert Gleiter Institute of Nanoscience of the Nanjing University of Science and Technology, Nanjing, China; and Institute for Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
Horst Hahn
Affiliation:
Institute for Nanotechnology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen, Germany; and KIT-TUD Joint Research Laboratory Nanomaterials, Institute of Materials Science, Technische Universitaet Darmstadt (TUD), 64287 Darmstadt, Germany
*
a)Address all correspondence to this author. e-mail: ofranke@usc.edu
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Abstract

The mechanical and thermal behavior of nanoglasses (NGs) were studied with a focus on the effect of the microstructure. The thermal expansion was measured to track changes in excess free volume during heating. It was found that the excess free volume, which is initially more dominant in the interphase region between the denser amorphous particles, is partially lost as well as redistributed during annealing. This relaxation during heating causes the nanoglass to behave like a melt-spun ribbon after heating while remaining amorphous. Nanomechanical tests were used to probe the local incipient plasticity and the influence of the interphase region. This interphase appears to affect the mechanical response of the NGs by inhibiting the propagation of shear bands and thus offers a novel approach for the introduction of plasticity in bulk metallic glasses. The results suggest that the NGs consist of two distinct amorphous phases with different glass transition temperatures.

Keywords

amorphousbiomaterialchemical compositiondiffusionelastic propertiesgrain boundarieshardnessmetalmicrostructurenano-indentationnanostructurepolycrystalscanning electron microscopy (SEM)scanning probe microscopy (SPM)storagetissueviscoelasticityorganicpolymerdislocations
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 10 , 28 May 2014 , pp. 1210 - 1216
Copyright
Copyright © Materials Research Society 2014 

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References

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