Mastering the methods of thermodynamic calculation and construction of phase diagrams of multicomponent systems based on aluminum

Abstract

Phase diagrams are the scientific basis for obtaining new materials. In this regard, the proposed thesis examines the theoretical foundations of technology for studying the laws of phase changes occurring in metals and alloys, obtaining new metal materials, their production and processing. The project considers the development of methods for calculating phase changes occurring in multicomponent aluminum-based alloys and the construction of diagrams of their phase state. The project emphasizes the need to search for scientifically sound methods for the manufacture of new heat-resistant, friction-resistant and corrosion–resistant aluminum alloys, including Al-Mg-Zn and Al-Cu-Si alloys. To this end, the analysis of modern methods of computer calculation of phase diagrams of multicomponent metal systems was carried out: The Thermo-Calc interactive database and the method of applying component distribution coefficients were considered. The crystallization process of solid solutions in an unbalanced state is calculated. As a result of calculations based on the alloy systems of the Al-Mg-Zn and Al–Cu-Si systems, polythermal and isothermal cross sections of phase diagrams of multicomponent systems are constructed. The phase composition and structure of alloys of the corresponding systems are investigated. The project analyzes the processes of unbalanced crystallization in alloys of the Al-Cu-Si, Al-Mg-Zn systems. The use of the proposed computational methods and technologies of their processing using computer programs (Thermo Calc) in the development of new alloys can significantly reduce the cost of material and financial resources for the production of finished products, as well as save time required for the thesis.