Authors: G.K. Bekseitova, A.G. Safarov, I.N. Ganiev, Dzh. Valiev

Title of the article: Effect of silicon additives on the thermophysical properties and thermodynamic characteristics of A6 grade aluminum

Year: 2026, Issue: 4, Pages: 89-97

Branch of knowledge: 2.6.1 Metal science and heat treatment of metals and alloys

Index UDK: 669.017: 620.197

DOI: 10.26730/1999-4125-2026-4-89-97

Abstract: In this paper, the effect of silicon alloying additives on the thermophysical properties and thermodynamic characteristics of A6 aluminum was investigated in a wide temperature range of 300–800 K. Experimental studies were carried out in the controlled cooling mode, which made it possible to obtain reliable data on the temperature dependence of the specific heat capacity of alloys with different silicon contents. Aluminum alloys with a Si concentration of 0.5; 0.8; 1.0 and 1.5 wt.% were chosen as the objects of study, which makes it possible to trace the patterns of property changes depending on the degree of alloying. It was found that silicon additives have a noticeable effect on the thermophysical parameters of aluminum. In particular, with an increase in the silicon content, a change in the nature of the temperature dependence of the specific heat capacity is observed, which is associated with a modification of the structure and interatomic interactions in the alloys. The obtained experimental data were used to calculate the main thermodynamic functions: enthalpy, entropy and Gibbs energy. An analysis of the results revealed that increasing silicon concentration in the studied range leads to a slight decrease in enthalpy and entropy, which may be due to structural ordering and a decrease in the degree of thermal excitation of the system. At the same time, the Gibbs free energy tends to increase in the concentration range of 0.5–0.8–1.0–1.5 wt.% Si, indicating a change in the thermodynamic stability of the alloys and possibly associated with increased interphase interactions. The obtained results have important scientific and practical significance for understanding the mechanisms by which alloying elements influence the properties of aluminum alloys and can be used in the development of new materials with specified thermophysical and performance characteristics.

Key words: aluminum grade A6 silicon heat capacity cooling mode enthalpy entropy Gibbs energy

Receiving date: 01.03.2026

Approval date: 01.09.2026

Publication date: 10.09.2026

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