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Article
Coalescence Mechanism of the Explosive Solidification of Supercooled Liquids
The explosive solidification of supercooled liquids is analyzed using heating and cooling thermograms of various substances. As proof of the phenomenon of explosive solidification, thermograms in the temperatu...
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Article
Solidification of the Eutectic Alloy in the Gallium–Indium System
The influence of the overheating of the Ga–14.2 mol % In eutectic alloy melt on the presolidification cooling is studied on 2-g samples by cyclic thermal analysis. In the case of the overheating of the liquid ...
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Article
Alternative Calculation of the Nucleus Size during Homogeneous Solidification from a Supercooled Liquid
An alternative approach to calculating the critical nucleus size and the nucleus formation energy has been developed. A significant difference between this method and the generally accepted so-called classical...
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Article
Laser Alloying of the Surface Layers of Aluminum Alloys for Improving Their Wear Resistance
The possibility of increasing the wear resistance of components made from AL25 and D16 aluminum alloys via surface alloying of the functional surfaces of the components is considered theoretically and experime...
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Article
Analysis of the Liquid–Cluster State of Melts near the Melting Point
We have analyzed the available data on the transition from equilibrium crystallization of melts of various substances to nonequilibrium explosive crystallization depending on preliminary heating of the liquid ...
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Article
Construction of Gallium–Tin Nonequilibrium State Diagram and Its Analysis
Overcooling of gallium–tin alloys under normal conditions has been studied by thermal analysis. The following samples have been analyzed: Ga (I); two hypoeutectic alloys: 95% Ga + 5% Sn (II), 90% Ga + 10% Sn (...
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Article
Analysis of the Gibbs Energy during the Formation of Eutectics
Dependences of free Gibbs energies GL and GS on the component content and temperature are analyzed for binary eutectic alloys, which are characterized by terminal solid solubility and are present in liquid (L), l...
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Article
Production of Tool Coatings by Chemicothermal Plasma Methods
Abstract—Two methods are considered for the production of wear-resistant coatings for cutting and stam** tools: plasma nitriding with subsequent oxidation; and plasma chemical vapor deposition of metals with pr...
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Article
Influence of Nitriding on the Wear Resistance and Adhesion of Zinc Coatings on Steel
Chemicothermal treatment of steel is considered: specifically, diffusional zinc coating in a nitrogen-bearing medium; and nitriding of a preformed zinc-filled coating. The structure of the modified layers is i...
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Article
Cyclic Supercooling of Liquid Bismuth Drops during Solidification
The laws of changing the presolidification supercooling of bismuth drops during continuous thermal cycling were studied by thermal analysis in the temperature–time coordinates. A sawtooth cyclic dependence of ...
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Article
Laser Surface Alloying of Aluminum Alloys
Surface alloying of aluminum alloys by means of laser heating is considered. The surface hardness of aluminum increases to 5000–7000 MPa on alloying with pure metals and to 6500–8000 MPa on alloying with chemi...
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Article
Improving the Properties of Low-Alloy and Carbon Steel Tools by Cyclic Nitriding
Cyclic nitriding characterized by uniform alternation of cycles with high and low nitrogen potential is considered. In the active stage of the process, the surface layer of the steel is saturated with nitrogen...
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Article
Solidification of the eutectic Sn–43 mol % Bi alloy
The processes of melting and solidification of the eutectic Sn–43 mol % Bi alloy are studied by cyclic thermal analysis. It is found that this alloy melts at a temperature T L =...
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Article
Thermal hysteresis during the melting and crystallization of macroobjects
Different thermal hysteresis processes associated with macroobjects have been analyzed using heating and cooling thermograms with regard to liquid–solid phase transformations. Two types of thermal hysteresis f...
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Article
Method for calculating the sizes of nucleation centers upon homogeneous crystallization from a supercooled liquid
An alternative approach to calculating critical sizes l k of nucleation centers and work A k ...
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Article
Solidification of the eutectic Ga–Sn alloy
Cyclic thermal analysis is used to study the effect of overheating of the eutectic Ga–8.5 mol % Sn melt on the presolidification supercooling. It is found that, when the liquid eutectic is overheated above the...
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Article
Geometrical thermodynamics analysis of the change in the Gibbs energy during the nonequilibrium solidification of eutectic alloys
Geometrical thermodynamics is used to analyze the possible dependences of the Gibbs energy on temperature and component concentration in the two-phase region during nonequilibrium solidification of eutectic al...
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Article
Nonequilibrium crystallization of alloys in the naphthalene-dibenzyl system
Precrystallization supercooling states ΔT L − in the naphthalene-dibenzyl system are investigated via thermal analysis to determine the metast...
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Article
Phase diagram of the Na2CO3 · 10H2O-Na2S2O3 · 5H2O system
Using thermal analysis, we have constructed the phase diagram of the crystalline hydrate system Na2CO3 · 10H2O-Na2S2O3 · 5H2O, which has been shown to have eutectic phase relationships. The eutectic composition i...
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Article
Crystallographic table of chemical elements
Regularities of changes in the structure of chemical elements in crystalline and liquid states under the action of temperature and pressure are systematized on the basis of the periodic table.
