Anomalous Temperature Dependences of Kinematic Viscosity in a Multicomponent Metal Melts

Abstract:

The temperature dependence of the kinematic viscosity was determined in the Fe_84.5Cu_0.6Nb_0.5Si_1.5B_8.6P₄C_0.3 melt, which has an anomaly in the temperature range 1700–1900 K. The cluster sizes participating in the viscous flow were calculated using the transition state theory. It is shown that the activation energy E_a is directly proportional to the natural logarithm of the cluster size d, and the melt viscosity decreases with increasing cluster size. In the anomalous region at heating, the activation energy first decreases and then increases. This behavior was associated with the cluster dissolution and the subsequent formation of new clusters with a different size and chemical composition. Upon cooling, the viscosity corresponds to the melt structure formed at the maximum heating temperature.

• Periodical: Key Engineering Materials (Volume 902)
• Pages: 3-8
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.902.3
• Online since: October 2021
• Authors: Vladimir S. Tsepelev*, Yuri N. Starodubtsev, Yekaterina A. Kochetkova
• Keywords: Cluster Size, Kinematic Viscosity, Melt Density, Multicomponent Melts

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