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

Published online by Cambridge University Press:  31 January 2011

K. M. Flores ,
D. Suh ,
R. H. Dauskardt ,
P. Asoka-Kumar ,
P. A. Sterne  and
R. H. Howell
K. M. Flores
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
D. Suh
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
R. H. Dauskardt
Affiliation:
Department of Materials Science and Engineering, Stanford University, Stanford, California 94305–2205
P. Asoka-Kumar
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
P. A. Sterne
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
R. H. Howell
Affiliation:
Lawrence Livermore National Laboratory, Livermore, California 94550
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Extract

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.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 1153 - 1161
Copyright
Copyright © Materials Research Society 2002

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