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Temperature dependence of specific heat and thermodynamic functions of Al + 4,5 % Fe alloys doped with tin

https://doi.org/10.17073/0021-3438-2019-1-50-58

Abstract

It is known that commercial aluminum with a high content of iron, silicon and other impurities has no industrial application because of low performance. Hence, the development of new alloy compositions based on such a metal is a very urgent task. Promising compositions in the Al—Fe diagram are the (a-Al + A3Fe) eutectic and hypereutectic compositions that correspond to an iron content of 2—5 wt.% due to a minimum range of crystallization temperature. An alloy with the composition Al + 4,5 % Fe (AlFe4,5) was taken as a model alloy and subjected to modification with tin. The paper experimentally determined the dependence of specific heat of the Al + 4,5 % Fe alloy doped with tin with the calculation of changes in its thermodynamic functions. Studies were carried out in a «cooling» mode using computer equipment and the Sigma Plot program. The polynomials of the temperature dependence of the specific heat and changes in thermodynamic functions (enthalpy, entropy, and Gibbs energies) were determined for Al + 4,5 % Fe alloys doped with tin and basic reference standard (Cu) defined by the correlation coefficient Rcorr = 0,999. It was found that the heat capacity of the initial alloy decreases with an increasing tin content and increases as temperature rises. The enthalpy and entropy of the Al + 4,5 % Fe alloy increase with rising tin content and temperature, while the Gibbs energy decreases.

About the Authors

I. N. Ganiev
Institute of Chemistry n.a. V.I. Nikitin of the Academy of Sciences of the Republic of Tajikistan
Tajikistan

Ganiev I.N. — Dr. Sci. (Chem.), acad. of the Academy of Sciences of the Republic of Tajikistan, prof., head of Laboratory «Corrosion-resistant materials».

734063, Dushanbe, Aini str., 299/2



A. G. Safarov
Physical-Technical Institute n.a. S .U. Umarov of the Academy of Sciences of the Republic of Tajikistan
Tajikistan

Safarov A.G. — Cand. Sci. (Chem.), leading researcher.

734064, Dushanbe, Aini str., 299/1



F. R. Odinaev
Physical-Technical Institute n.a. S.U. Umarov of the Academy of Sciences of the Republic of Tajikistan
Tajikistan

Odinaev F.R. — leading researcher.

Dushanbe


U. Sh. Yakubov
Institute of Chemistry n.a. V.I. Nikitin of Academy of Sciences of the Republic of Tajikistan
Tajikistan

Yakubov U.Sh. — PhD student.

Dushanbe


K. Kabutov
Physical-Technical Institute n.a. S.U. Umarov of the Academy of Sciences of the Republic of Tajikistan
Tajikistan

Kabutov K. — head of the Centre for research and use of renewable energy.

Dushanbe



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For citations:


Ganiev I.N., Safarov A.G., Odinaev F.R., Yakubov U.Sh., Kabutov K. Temperature dependence of specific heat and thermodynamic functions of Al + 4,5 % Fe alloys doped with tin. Izvestiya. Non-Ferrous Metallurgy. 2019;(1):50-58. (In Russ.) https://doi.org/10.17073/0021-3438-2019-1-50-58

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