FEATURES OF CALCULATION OF PARAMETERS OF DIFFUSION IN TWO-COMPONENT MULTIPHASE SYSTEMS AT "LIMITED" INTAKE OF THE COMPONENT WITH A SMALLER TEMPERATURE OF MELTING
Abstract
. Subject of research ― process of the solution of a task on change of duration of the incubatory periods for phases which have to appear in a diffusive zone after the component layer with a smaller temperature of melting is exhausted, topic ― identification of features of calculation of parameters of diffusion in two-component multiphase systems at "limited" intake of this component, the purpose ― to offer a way of the solution of a task on change of duration duration of the incubatory periods for phases which have to appear in a diffusive zone after the component layer with a smaller temperature of melting is exhausted.
Methods and methodology. Chemical and thermal methods of processing, in particular, method of diamond turning; a method of the smallest squares in a method of calculation of parameters of diffusion in two-component multiphase system.
Results. The method of calculation of parameters of diffusion in two-component multiphase systems at "limited" intake of a component with a smaller temperature of melting is offered. The dependence of thickness of a layer of this component in two-component multiphase system is constructed. Dynamics of growth of phases in this system from diffusion time is investigated. The dependence of the incubatory period of appearance of the subsequent phases from layer thickness of component with a smaller temperature of melting in two-component multiphase system. The example of the practical solution of a task on change of duration of the incubatory periods for phases in the copper-gallium system is given which have to appear in a diffusive zone after the component layer with a smaller temperature of melting is exhausted.
Conclusions. It is shown that in two-component multiphase system for each subsequent new phase there is a critical value of thickness of a layer of a component with a smaller temperature of melting. At a thickness, smaller critical value, a certain duration of process of annealing causes change of the incubatory period of these phases regardless of the fact that preceded it: component exhaustion with a smaller temperature of melting or dissolution of one of the previous phases.
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References
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