T. M. Taova, V. N. Lesev, F. M. Mal’surgenova

ABSTRACT:

The densities and molar volumes of ternary alloys located on two secant lines going towards Cs and K vertices in Na–K–Cs concentration triangle and including the 13.9Na + 43.5K + 42.6Cs (in at %) eutectic alloy with the melting point of 195.2 K have been presented. The isotherms of density of the ternary alloys for the both sections show a positive deviation from additive law, while the isotherms of the molar volumes correspond to the last law.

KEY WORDS:

density, molar volume, ternary alloy, alkali metal, eutectic alloy, sodium-potassium-cesium

V. D. Aleksandrov, S. A. Frolova, E. A. Pokintelitsa, A. P. Zozulya, Sh. K. Amerkhanova

ABSTRACT:

A scheme for the cluster structure of a binary melt of the eutectic type in superheated and supercooled states with respect to the liquidus temperatures is developed. The dynamics of the change in the structure of a clustered liquid with cooling and further equilibrium and nonequilibrium crystallization is analyzed. The regions of coexistence of a liquid solution with clusters, nucleus, and a solid phase are indicated. The boundaries of cluster demixing and the ways of their transformation into eutectic colonies are determined by the binodal. Thermograms of cooling characterizing various types of alloys crystallization are considered. On their basis, an analysis of the ways of crystallization from the state diagram is given.

KEY WORDS:

melts, binary system, alloys, state diagram, eutectic, clusterization, nucleus, equilibrium and nonequilibrium crystallization, thermograms, binodal, demixing