Temperature and time dependences of the viscosity of InBi100 – хPbх melts (where х = 0, 19, 40, 60, 80, 100 at %) have been studied by the method of damped torsional oscillations. Intermediate compositions of this system have been studied for the first time. It has been demonstrated that the viscosity and the oscillation period curves for InBi–Pb melts containing up to 40 at % Pb measured in the heating and cooling modes are coincident and monotonic. In the InBi40Pb60 melt, the hysteresis of the viscosity and oscillation period of the suspension system with the melt is observed only in the first heating–cooling cycle, and in InBi20Pb80, after the first heating–cooling cycle, the viscosity hysteresis changes sign from negative to positive. From the results of measurements of the time dependences of the viscosity of the InBi40Pb60 melt at a constant temperature, the relaxation time is determined, which decreases exponentially with increasing temperature. The activation energy of the melt homogenization process was found to be Ea = 83 kJ/mol. The relaxation time and activation energy of the homogenization process determined in this work significantly exceed the values obtained in the literature for other systems. The long relaxation time near the liquidus suggests that this nonequilibrium state in the InBi40Pb60 melt is metastable.
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The work was supported by the Russian Foundation for Basic research (project no. 19–03–00770-а).
Translated by G. Kirakosyan
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Filippov, V.V., Shunyaev, K.Y. & Leont’ev, L.I. Temperature and Time Dependences of the Viscosity of InBi–Pb Melts. Dokl Phys Chem 494, 139–142 (2020). https://doi.org/10.1134/S0012501620090018
- temperature and time dependences
- InBi–Pb melts
- metastable state