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Fragile-to-strong transition in metallic glass-forming liquids
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Image of FIG. 1.
FIG. 1.

Viscosities of liquid water and three metallic glass-forming liquids as a function of the scaled temperature , where is the glass transition temperature. The dashed line shows a sketch of the F-S transition region for water. The solid lines are fits of Eq. (2) to the experimental viscosity data of and OTP.

Image of FIG. 2.
FIG. 2.

Viscosities as functions of the scaled temperature for eight metallic glass-forming liquids. Solid curves: fits of Eq. (2) to the measured viscosity data. Inset in Fig. 2(b): the relaxation time as a function of for the glass.

Image of FIG. 3.
FIG. 3.

Comparison of the models in Eq. (2) (dashed lines) and Eq. (7) (solid lines). Here, Eq. (2) is fit to the high temperature viscosity data only. The viscosity data are shown for two metallic glass-forming liquids.

Image of FIG. 4.
FIG. 4.

The double exponential form of Eq. (7) includes two contributions to the overall viscous behavior of metallic glass-forming liquids: a fragile term dominant at high temperatures and a strong term dominant at low temperatures. These terms correspond to two different relaxation mechanisms, which have a comparable time scale during the F-S transition. The fits are shown for two metallic glass-forming liquids: (a) ; (b) .


Generic image for table
Table I.

Optimized viscosity parameters of Eq. (2), expressed in terms of the glass transition temperature , the fragility parameters and , and the F-S transition magnitude .

Generic image for table
Table II.

Optimized viscosity parameters using the extended MYEGA model of Eq. (7).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Fragile-to-strong transition in metallic glass-forming liquids