Effect of the Structural-Phase Composition of the Surfaces of Substrates of Different Composition on the Spreading of a
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ct of the Structural-Phase Composition of the Surfaces of Substrates of Different Composition on the Spreading of a Melt and Their Relation to Their Phase Diagram A. A. Akhkubekova, *, S. N. Akhkubekovab, Yu. M. Gufanc, and M. Z. Laipanovd aKabardino-Balkarian
State University, Nalchik, 360004 Russia Research Institute of Physics, Kabardino-Balkarian State Agricultural University, Nalchik, 360004 Russia c Research Institute of Physics, Southern Federal University, Rostov-on-Don, 344090 Russia d Karachayevsk-Cherkess State University, Karachaevsk, 369202 Russia *e-mail: [email protected]
b
Received March 19, 2020; revised April 10, 2020; accepted May 27, 2020
Abstract—A way of forming and depositing dosed droplets on the surface of a solid substrate with or without variable composition is proposed. Contact melting closely related to phase diagram is used to obtain such substrates and droplets of different concentrations. This relationship allows studies of the concentration and temperature dependences of surface characteristics under identical conditions, increasing the accuracy of their determination. It is shown that the microstructure of a substrate of variable composition affects the spreading of droplets over its surface. DOI: 10.3103/S1062873820090038
INTRODUCTION Investigations of the kinetics of the spreading of liquid metals on a solid surface in certain ranges of concentration and temperature show that the formation of different phases (e.g., intermetallic compounds) impairs the physicochemical properties of the zones of joints during fusion welding. This issue becomes even more relevant when the objects of practical use are materials with surfaces of variable composition (e.g., composite materials, multiphase alloys, and porous materials). The solution to this problem is also closely related to the formation and deposition of droplets of identical size onto corresponding points on the surfaces of substrates of variable composition. We believe a successful model for studying this problem is zones of transition obtained by contact melting (CM) in the non-steady diffusion regime (NDR) [1]. There is virtually no discussion of such problems in the scientific literature, even though solving similar tasks is of scientific and practical interest. The aim of this work was to develop a way of producing and depositing droplets of metal liquids of identical size under identical conditions, in specific amounts and in identical experiments, from both pure metals and alloys of different concentrations, to the corresponding surface points of substrate, and estab-
lishing the relationship between their phase state and surface characteristics (i.e., the shape and diameter of a spreading spot). This work is a continuation of [2], in which the dependence of the configuration and size of a spot on the location of a droplet of liquid metal on the surface of a substrate of variable composition was shown experimentally. OBTAINING DROPLETS OF IDENTICAL SIZE Solving the problem of forming and depositing dosed droplets on the surfac
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