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Thermal and plastic behavior of nanoglasses

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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.

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ACKNOWLEDGMENTS

We would like to thank Dr. Tao Feng (KIT) for preparing the nanoglass samples. The discussions with Dr. Chris Eberl (KIT) on the DIC and Prof. Andrea Hodge (USC) are gratefully acknowledged. We would also like to thank Dr. Ruth Schwaiger (KIT) for providing access to the MTS/Agilent nanoindenter.

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Authors and Affiliations

  1. 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, USA

    Oliver Franke

  2. Institute for Applied Materials, 76344, Eggenstein-Leopoldshafen, Germany

    Daniel Leisen

  3. Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, Nanjing, China

    Herbert Gleiter

  4. Institute for Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344, Eggenstein-Leopoldshafen, Germany

    Herbert Gleiter & Horst Hahn

  5. KIT-TUD Joint Research Laboratory Nanomaterials, Institute of Materials Science, Technische Universitaet Darmstadt (TUD), 64287, Darmstadt, Germany

    Horst Hahn

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  1. Oliver Franke
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  2. Daniel Leisen
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  3. Herbert Gleiter
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  4. Horst Hahn
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Correspondence to Oliver Franke.

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Franke, O., Leisen, D., Gleiter, H. et al. Thermal and plastic behavior of nanoglasses. Journal of Materials Research 29, 1210–1216 (2014). https://doi.org/10.1557/jmr.2014.101

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  • DOI: https://doi.org/10.1557/jmr.2014.101

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