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Free Volume Changes in Bulk Amorphous Alloys During Structural Relaxation and in the Supercooled Liquid State

Published online by Cambridge University Press:  10 February 2011

C. Nagel ,
K. Rätzke ,
E. Schmidtke  and
F. Faupel
C. Nagel
Affiliation:
Universität Kiel, Technische Fakultät, Lehrstuhl füfir Materialverbunde, Kaiserstr. 2, D-24143 Kiel, Germany
K. Rätzke
Affiliation:
Universität Kiel, Technische Fakultät, Lehrstuhl füfir Materialverbunde, Kaiserstr. 2, D-24143 Kiel, Germany
E. Schmidtke
Affiliation:
Universität Kiel, Technische Fakultät, Lehrstuhl füfir Materialverbunde, Kaiserstr. 2, D-24143 Kiel, Germany
F. Faupel
Affiliation:
Universität Kiel, Technische Fakultät, Lehrstuhl füfir Materialverbunde, Kaiserstr. 2, D-24143 Kiel, Germany
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Abstract

Volume changes in Zr46.7Ti8.3Cu7.5Ni10Be27.5 and Zr 65Al7.5Ni10Cu17.5 bulk metallic glasses have been observed by positron annihilation and density measurements. At low cooling rates excess volume of the order of 0.1 % is quenched in both glasses. Isothermal relaxation kinetics below the glass transition temperature obey a Kohlrausch law with exponents of β≈(0.3 ± 0.1). Structural relaxation is not accompanied by embrittlement, as indicated by simple mechanical tests. The outer surface plays a crucial role in annealing of excess volume, which can be restored by annealing above Tg. The observed free volume changes are at variance with the behavior of a perfectly strong glass. The temperature dependence of the positron lifetime is discussed in terms of thermal detrapping from shallow traps.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 554: Symposium MM – Bulk Metallic Glasses , 1998 , 75
Copyright
Copyright © Materials Research Society 1999

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