Temperature Dependence of Heat Capacity and the Variation in Thermodynamic Function of the AZh 4.5 Alloy Doped with Tin

It is known that technical aluminum with an elevated content of iron, silicon, and other impurities cannot find application in industry because of its low performance characteristics. Therefore, the development of new alloy compositions based on such a metal is very urgent. Eutectic (α-Al + Al 3 Fe)...

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Bibliographic Details
Published in:Russian journal of non-ferrous metals 2019-03, Vol.60 (2), p.139-145
Main Authors: Ganiev, I. N., Safarov, A. G., Odinaev, F. R., Yakubov, U. Sh, Kabutov, K.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Chemistry and Materials Science
Composition
Copper
Correlation coefficients
Crystallization
Enthalpy
Entropy
Heat
Industrial applications
Iron
Materials Science
Mathematical analysis
Metallic Materials
Metallurgy of Nonferrous Metals
Polynomials
Specific heat
Temperature
Temperature dependence
Tin
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Summary:It is known that technical aluminum with an elevated content of iron, silicon, and other impurities cannot find application in industry because of its low performance characteristics. Therefore, the development of new alloy compositions based on such a metal is very urgent. Eutectic (α-Al + Al 3 Fe) in the Al–Fe diagram and hypereutectic alloys are promising because, having a minimal crystallization range, they correspond to an iron content of 2–5 wt %. The alloy of the composition Al + 4.5% Fe (AZh4.5) is accepted in this study as a model alloy and is subjected to modification with tin. The temperature dependence of heat capacity of the tin-doped AZh4.5 alloy is determined and the variation in its thermodynamic functions is calculated. Investigations are performed in the cooling mode using a computer and the Sigma Pilot program. The polynomials of the temperature dependence of heat capacity and varying the thermodynamic functions (enthalpy, entropy, and Gibbs energy) of the tin-doped AZh4.5 alloy and reference sample (Cu) are established with correlation coefficient R corr = 0.999. It is established that the heat capacity of the initial alloy decreases with an increase in the tin content and increases with an increase in temperature. Enthalpy and entropy of the AZh4.5 alloy increase with an increase in the tin content and temperature, while the Gibbs energy decreases.
ISSN:1067-8212
1934-970X
DOI:10.3103/S1067821219020044