Ganiev I.N., Sharipova Kh.Ya., Odinazoda Kh.O., Ibrokhimov N.F., Ganieva N.I. Thermophysical Properties and Thermodynamic Functions of Aluminum-Magnesium Alloy AMg2 with Indium

Abstract

Problem Statement (Relevance): The use of aluminum and its alloys as structural materials is due to their corrosion resistance. Aluminum-magnesium alloys have high corrosion resistance in atmospheric and marine conditions, in alkaline solutions and low density acid solutions, and good machining properties. The corrosion resistance of these alloys significantly exceeds the resistance of cast alloys of other aluminum-based systems. A main reason for high corrosion resistance of aluminum-magnesium alloys in various solutions is the formation of a hydrate film that delays the corrosion process. High strength of the alloys of this system is explained by an increase in the distortion of the crystal lattice with an increase in the magnesium content in the solid solution. To improve the corrosion and mechanical properties, aluminum-magnesium alloys are supplemented with additives of various metals. One of the most important characteristics of aluminum-magnesium alloys is heat capacity. Measurement of heat capacity and its temperature dependence play a major role in studies on alloys. There is no information in the literature on the effect of indium additives on the heat capacity of the AMg2 aluminum-magnesium alloy. Objective: study of the temperature dependence of the thermophysical properties and thermodynamic functions of the AMg2 aluminum-magnesium alloy with indium. Methods Used: There are many described methods for measuring the heat capacity of solids. In this paper we use the method of comparing the cooling curves of the reference and test samples in the "cooling" mode using a copper standard (Cu grade M00) in the range of 300-800 K. Novelty: For the first time, the effect of indium additives on the thermophysical properties and changes in the thermodynamic functions of the AMg2 aluminum-magnesium alloy was studied. Findings: We identified mathematical models describing the temperature dependence of the heat capacity of the AMg2 alloy on the indium content and changes in their thermodynamic functions in the indicated temperature range. As a result of the studies, it was shown that with increasing temperature the heat capacity, enthalpy and entropy of the alloys increase, and the value of the Gibbs energy decreases. Additives of indium in the AMg2alloy slightly reduce the value of these functions. Practical Relevance: The obtained characteristics of the thermophysical properties and thermodynamic functions of the AMg2 aluminum-magnesium alloy with indium will be added to the corresponding handbooks of thermophysics of materials and may be used in the design of parts and machines from these alloys.

Keywords

AMg2 aluminum alloy, indium, heat capacity, “cooling” mode, enthalpy, entropy, Gibbs energy.

Izatullo N. Ganiev – DrSc (Chem.), Academician of the Academy of Sciences of the Republic of Tajikistan, Professor Osimi Tajik Technical University, Dushanbe, Tajikistan. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Khilola Ya. Sharipova – Senior Lecturer Khatlon State Medical University. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Khaydar O. Odinazoda – DrSc (Eng.), Professor, Corresponding Member, the Academy of Sciences of the Republic of Tajikistan, Rector Osimi Tajik Technical University, Dushanbe, Tajikistan. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Nasim F. Ibrokhimov – PhD (Eng.), Associate Professor Osimi Tajik Technical University, Dushanbe, Tajikistan. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Nargis I. Ganieva – PhD (Eng.), Associate Professor Osimi Tajik Technical University, Dushanbe, Tajikistan. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

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Details: Published: 24 December 2019; Last Updated: 24 December 2019; Hits: 2461