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Studies of Relaxation of Metallic Glasses by Dilatometry and Density Measurements

Published online by Cambridge University Press:  21 February 2011

R.W. Cahn ,
N.A. Pratten ,
M.G. Scott ,
H.R. Sinning  and
L. Leonardsson
R.W. Cahn
Affiliation:
Recently Université de Paris-Sud: now Clare Hall, Cambridge Formerly at Sussex University.
N.A. Pratten
Affiliation:
Dept. of Physics, University of Warwick, Coventry, England Formerly at Sussex University.
M.G. Scott
Affiliation:
Standard Telephone Laboratories, Harlow, Essex, England Formerly at Sussex University.
H.R. Sinning
Affiliation:
Institut für Werkstoffe, Technische Universität Braunschweig, F.R. Germany
L. Leonardsson
Affiliation:
Dept. of Physics, Chalmers University of Technology, Göteborg, Sweden.
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Abstract

High-precision density measurements on coldrolled Pd77.5Cu6Si16.5 glass rods before and after relaxation anneals showed that 30 – 40% rolling leads to a density reduction of ∼0.14%, recoverable on subsequent annealing below Tg. This change is about half of the density increase attainable by recovery-annealing the as-quenched glass.

Density changes in Fe40Ni40B20 glass ribbon, resulting from recovery-annealing, were studied indirectly by measuring isothermal length changes through dilatometry of foil sandwiches. The experimental conditions for reliable isothermal dilatometry, using a commercial instrument, are outlined. It was found that the kinetics of length change in the longitudinal and transverse directions were quite different, being faster in the former. Prolonged recovery-annealing prior to dilatometry removed this difference. The intermediate stage of each isotherm followed loqt kinetics.

Experiments were performed with Fe40Ni40B20, Ni64Zr36 and Cu66Ti34 to search for a reversible component of length change during cyclic isothermal holds at two temperatures. Such a component probably exists but is extremely small, less than 1% of the limiting irreversible length change.

The implications of the various findings are discussed in the light of recent literature.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 28: Symposium F – Rapidly Solidified Metastable Materials , 1983 , 241
Copyright
Copyright © Materials Research Society 1984

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References

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