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Characterization of Free Volume in a Bulk Metallic Glass Using Positron Annihilation Spectroscopy

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Abstract

The free volume of metallic glasses has a significant effect on atomic relaxation processes, although a detailed understanding of the nature and distribution of free volume sites is currently lacking. Positron annihilation spectroscopy was employed to study free volume in a Zr–Ti–Ni–Cu–Be bulk metallic glass following plastic straining and cathodic charging with atomic hydrogen. Multiple techniques were used to show that strained samples had more open volume, while moderate hydrogen charging resulted in a free volume decrease. It was also shown that the free volume is associated with zirconium and titanium at the expense of nickel, copper, and beryllium. Plastic straining led to a slight chemical reordering.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Stanford University, 94305-2205, Stanford, California, USA

    K. M. Flores, D. Suh & R. H. Dauskardt

  2. Lawrence Livermore National Laboratory, 94550, Livermore, California, USA

    P. Asoka-Kumar, P. A. Sterne & R. H. Howell

Authors
  1. K. M. Flores
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  2. D. Suh
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  3. R. H. Dauskardt
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  4. P. Asoka-Kumar
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  5. P. A. Sterne
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  6. R. H. Howell
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Flores, K.M., Suh, D., Dauskardt, R.H. et al. Characterization of Free Volume in a Bulk Metallic Glass Using Positron Annihilation Spectroscopy. Journal of Materials Research 17, 1153–1161 (2002). https://doi.org/10.1557/JMR.2002.0171

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  • DOI: https://doi.org/10.1557/JMR.2002.0171

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