INVESTIGATION OF THE SPECIFIC HEAT CAPACITY AND CHANGES IN THE THERMODYNAMIC FUNCTIONS OF THE AZH5K10 ALUMINUM ALLOY MODIFIED WITH BARIUM

Modern materials must combine high properties and qualities to ensure the necessary service life and reliability of the products of aerospace technology, mechanical engineering, nuclear energy, radio engineering, electronics, etc. In this regard, the production and use of aluminum and its alloys, which have high corrosion resistance, mechanical strength and other specific properties, is of particular importance. The paper presents the results of a study of the thermophysical properties and thermodynamic functions of the aluminum alloy AZh5K10 with barium. To measure the specific heat capacity of the alloys, a method was used to compare the cooling rates of two samples, which makes it possible to determine the temperature with reliable accuracy, as well as the dependence of the heat capacity of substances on temperature. The studies were carried out in the “cooling” mode. The temperature dependence of the specific heat capacity and changes in the thermodynamic functions of the aluminum alloy AZh5K10 with barium was carried out in the temperature range 300 - 800 K. It is shown that with an increase in the concentration of barium, the heat capacity and heat transfer coefficient of the aluminum alloy AZh5K10 decrease, and increase with temperature. It has been found that the enthalpy and entropy of the alloys increase with increasing temperature, and the value of the Gibbs energy decreases.

1. Beletskii V.M., Krivov G.A. Aluminum alloys (Composition, properties, technology, application). Kyiv: Komitekh, 2005, 365 p. (In Russ.).

2. Luts A.R., Suslina A.A. Aluminium and its alloys. Samara: Samarskii gosudarstvennyi tekhnicheskii universitet, 2013, 81 p. (In Russ.).

3. Umarova T.M., Ganiev I.N. Corrosion of double aluminum alloys in neutral media. Dushanbe: Donish, 2007, 258 p. (In Russ.).

4. Drits M.E. Aluminium alloys. Properties, processing, application. Moscow: Metallurgiya, 1979, 679 p. (In Russ.).

5. Chen X.G. Growth mechanisms of intermetallic phases in DC cast AA1XXX alloys. Essential Readings in Light Metals. Cast Shop for Aluminum Production. 2013, vol. 3, pp. 460–465. http://doi.org/10.1007/978-3-319-48228-6_57

6. Grange D.A. Microstructure control in ingots of aluminum alloys with an emphasis on grain refinement. Essential Readings in Light Metals. Cast shop for aluminum production. 2013, vol. 3, pp. 354–365.

7. Geoffrey K.S. Fundamentals of solidification in aluminum castings. International Journal of Metalcasting. 2014, vol. 8, pp. 7–20.

8. Bergman G.A., Veits I.V., Medvedov V.A., Khachkuruzov G.A., Yungman V.S. Thermodynamic properties of individual substances. Moscow: Nauka, 1981, 472 p. (In Russ.).

9. Ismailov N.Sh., Ibragimov Kh.A. Development of low-alloyed aluminum alloy for electrical products. Uspekhi sovremennoi nauki. 2017, vol. 1, no. 6, pp. 236–240. (In Russ.).

10. Mal'tsev M.V. Modification of the structure of metals and alloys. Moscow: Metallurgiya, 1984, 280 p. (In Russ.).

11. Gureeva M.A., Ovchinnikov V.V., Manakov I.N. Metalworking: macro- and microstruc-tures of cast aluminum alloys. Tutorial. Moscow, 2019, 250 p. (In Russ.).

12. Setyukov O.A. Influence of iron and silicon on casting properties of aluminium alloys with manganese. Tekhnologiya legkikh splavov. 2010, no. 1, pp. 32–37. (In Russ.).

13. Stanford N., Atwell D., Beer A., Daviesc C., Barnett M.R. Effect of microalloying with rare-earth elements on the texture of extruded magnesium-based alloys. Scripta Mater. 2008, vol. 59, no. 7, pp. 772–775.

14. Ibrokhimov N.F., Ganiev I.N., Odinaev Kh.O. Physicochemistry of AMg2 alloy with rare earth metals. Dushanbe: Tadzhikskii tekhnicheskii universitet im. M.S. Osimi, 2016, 153 p. (In Russ.).

15. Ivantsov G.P. Metal heating (theory and methods of calculation). Sverdlovsk-Moscow: Gosudar. nauchno-tekhn. izd-vo literatury po chernoi i tsvetnoi metallurgii, 1948, 191 p. (In Russ.).

16. Bagnitskii V.E. Inverses in physical phenomena. (Continuation of the book New Physics of Electronic Devices). Germany: Ed. home LAP LAMBERT Academic Publishing, 2014, 196 p. (In Russ.).

17. Kirov S.A., Kozlov A.V., Saletskii A.M., Kharabadze D.E. Measurement of heat capacity and heat of melting by cooling. Tutorial. Moscow: OOP Fizicheskii fakul'tet MGU im. M.V. Lomonosova, 2012, 52 p. (In Russ.).

18. Eremina R.M., Skvortsov A.I., Mutygullina A.A. Experimental problems of the general physical workshop in molecular physics and thermodynamics. Transfer processes. Fluids and solids. Kazan: Kazanskii (Privolzhskii) federal'nyi universitet, 2015, 42 p. (In Russ.).

19. Rogachev N.M., Guseva S.I. Determination of specific heat capacity of solid bodies: Method. instructions to the lab. work no. 1-23. Samara: Samarskii gosudarstvennyi aerokosmicheskii universitet imeni akademika S.P. Koroleva, 2012, 14 p. (In Russ.).

20. Ganiev I.N., Safarov A.G., Odinaev F.R., Yakubov U.Sh., Kabutov K. Temperature dependence of heat capacity and change of thermodynamic function of AJ 4.5 alloy with tin. Izvestiya vuzov. Nonferrous metallurgy. 2019, no. 1, pp. 50–58. (In Russ.).

21. Ganiev I.N., Rashidov A.R., Odinazoda Kh.O., Safarov A.G., Dzhailoev Dzh.Kh. Influence of copper additives on heat capacity and thermodynamic functions of aluminium grade A7Ye. Izvestiya vuzov. Nonferrous metallurgy. 2020, no. 3, pp. 4–12. (In Russ.).

22. Ganiev I.N., Abdulakov A.P., Dzhailoev D.Kh., Yakubov U.Sh., Safarov A.G., Abulkhaev V.D. Influence of bismuth additives on thermophysical and thermodynamic properties of E-AlMgSi alu-minium conductor alloy ("aldray"). Izvestiya vuzov. Electronic materials. 2020, vol.23, no. 1, pp. 86–93. (In Russ.).

23. Ganiev I.N., Nazarova M.T., Yakubov U.Sh., Safarov A.G., Kurbonova M.Z. Influence of lithium on specific heat capacity and changes in thermodynamic functions of aluminum alloy AB1. Teplofizika vysokikh temperatur. 2020, vol. 58, no. 1, pp. 55–60. (In Russ.).

24. Ganiev I.N., Parkhutik P.A., Vakhobov A.V., Kupriyanova I.Yu. Modification of silumins with strontium. Minsk: Science and technology, 1985, 143 p. (In Russ.).