TITLE

Newtonian viscosity of supercooled liquid in a Pd[sub 40]Ni[sub 40]P[sub 20] metallic glass

AUTHOR(S)
Kawamura, Yoshihito; Inoue, Akihisa
PUB. DATE
August 2000
SOURCE
Applied Physics Letters;8/21/2000, Vol. 77 Issue 8
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The Newtonian viscosity of the supercooled liquid measured by the continuous-strain-rate tensile test was investigated in the Pd[sub 40]Ni[sub 40]P[sub 20] metallic glass. It was found that continuous-strain-rate tests were applicable to determine the viscosity over a wide strain-rate region, and that the measured Newtonian viscosity η[sub 0] corresponded to the equilibrium one. The viscosity η over the entire strain-rate interval could be well described by one master curve expressed with a stretched exponential function η/η[sub 0]=1-exp(C/ε.[sup β]) in which β was 0.82. The free-volume-theory relation proposed by Cohen and Grest reproduced the equilibrium viscosity data over the entire temperature region better than the famous Vogel-Fulcher-Tammann relation. The supercooled liquid of the Pd[sub 40]Ni[sub 40]P[sub 20] metallic glass was classified into the relatively strong liquids as well as the other metallic glasses. The Pd[sub 40]Ni[sub 40]P[sub 20] metallic glass that is a metal-metalloid alloy exhibited to be more fragile than metal-metal glasses. © 2000 American Institute of Physics.
ACCESSION #
4414511

 

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