Abstract
We investigated the viscosity of CuPb, CuPbSn, CuPbSnGa and CuPbSnGaBi melts of equiatomic compositions by the method of damped torsion vibrations of a crucible. We saw the melts of equiatomic composition as the melts high-entropy. All the investigated melts demonstrated the different temperature dependences of viscosity for heating and cooling. There is an anomalous reduction in viscosity resulted when the melt is heated to a specific temperature. The anomalous behaviour for viscosity we interpreted in terms of melt structure. This structural changes in the melt resulted when the melt is heated to a specific temperature. The microstructure of CuPbSnGaBi ingot of equiatomic composition we investigated using optical microscopy and measurement of microhardness. Collations data of the microstructures with of the microhardness gave three structural components: CuGa2 dendrites, (Sn) + (Bi) + Bi3Pb7 ternary eutectic and rounded Pb inclusions having dimensions of 5 m.
Highlights
It is known that most multicomponent liquid alloys are far from ideal solutions and reveal a microinhomogeneous atomic distribution
The present study investigates the viscosity of CuPb, CuPbSn, CuPbSnGa and CuPbSnGaBi equiatomic composition liquid alloys, with special attention given to the analysis of the temperature dependence of the viscosity coefficient using the theory of absolute reaction rates
T* is the temperature of the beginning of the matching portion of the temperature dependence of the viscosity, which is obtained by heating and cooling
Summary
It is known that most multicomponent liquid alloys are far from ideal solutions and reveal a microinhomogeneous atomic distribution. The existence of inhomogeneous structure in liquid alloys within some temperature range is related to the anomalous temperature dependences of physicochemical properties. For destruction of microinhomogeneity in liquid alloy involves it heating to a temperature at which complete mixing of components and formation of a homogeneous solution come about, which substantially changes conditions of metal crystallization. It is known such this heating of liquid alloy at subsequent cooling and crystallization, even at relatively low cooling rates (1-10 K/s) enables getting a microstructure similar to microstructure, which is formed at high cooling rates [6].
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