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Abstract
Mathematical model aimed at obtaining NiAl alloys with a given structure and properties is proposed and implemented, based on the use of data on the features of the physical modeling of the thermochemical pressing process. For a mathematical description of the process of extrusion of a high-temperature synthesis product, it is necessary to determine a system of equations that takes into account the distribution of the thermo-kinetic and rheological properties of the synthesis product in a mold and caliber. High-temperature synthesis of intermetallic compound NiAl in a powder mixture of pure elements in the conditions of thermochemical pressing allows to obtain an intermetallic alloy with an average grain size of ~ 40—50 microns.
Highlights
Математична модель, спрямована на одержання сплавів NiAl із заданою структурою та властивостями, пропонується та реалізується на основі використання даних про особливості фізичного моделювання процесу термохімічного пресування
It is established that the main characteristics of intermetallic alloys greatly depend on phase structure [1]
In addition to the kinetic equations for the formation of the intermetallic structure, the activation energy and chemical transformation, it is necessary to use the rheological equations used in describing the rhodinamic models, which allows us to carry out numerical calculations of the kinetic dependences of the basic parameters of the process of compressing the product of high-temperature synthesis — the temperature of synthesis, the completeness of chemical transformation, macroscopic the density of the product of synthesis, the level of elastic stresses in the product, the velocity of its melting point stycheskoy deformation and grain size finite product
Summary
The starting material for SHS synthesis of the intermetallic compound NiAl is a powder mixture of nickel with aluminum, placed in the form of a molding in a closed mold. The plastic deformation ceases when the synthesis product is cooled to a temperature Tk, at which it loses ductility. Assuming that the extrusion occurs in conditions of one-sided compression of the synthesis product in the absence of friction on the walls of the mold, we can write the initial equations: 1. It is assumed that the distribution of relative density in the initial powder mixture is uniform: ρ(z, 0) = ρ0. Α — depth of chemical transformation of the intermetallic compound during the synthesis; c0 — relative mass concentration of titanium in the initial binary powder mixture
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