Advertisement

Russian Journal of Non-Ferrous Metals

, Volume 60, Issue 2, pp 139–145 | Cite as

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

  • I. N. GanievEmail author
  • A. G. SafarovEmail author
  • F. R. Odinaev
  • U. Sh. YakubovEmail author
  • K. Kabutov
METALLURGY OF NONFERROUS METALS
  • 5 Downloads

Abstract

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 + Al3Fe) 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 Rcorr = 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.

Keywords:

AZh5 alloy tin cooling mode heat capacity thermodynamic functions enthalpy entropy Gibbs energy 

Notes

REFERENCES

  1. 1.
    Luts, A.R. and Suslina, A.A., Alyuminii i ego splavy (Aluminum and Its Alloys), Samara: SamGTU, 2013.Google Scholar
  2. 2.
    Beletskii, V.M. and Krivov, G.A., Alyuminievye splavy (sostav, svoistva, tekhnologiya, primenenie): Spravochnik (Aluminum Alloys (Composition, Properties, Technology, and Application): Handbook), Fridlyander, I.N, Ed., Kiev: KOMITEKh, 2005.Google Scholar
  3. 3.
    Stanford, N., Atwell, D., Beer, A., Daviesc, C., and 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.CrossRefGoogle Scholar
  4. 4.
    Menan, F. and Henaff, G., Synergistic action of fatigue and corrosion during crack growth in the 2024 aluminum alloy, Procardia Eng., 2010, vol. 2, no. 1, pp. 1441–1450.CrossRefGoogle Scholar
  5. 5.
    Hu, X.W., Jiang, F.G., and Yan, H., Effects of rare earth Er additions on microstructure development and mechanical properties of die-cast ADC12 aluminum alloy, J. Alloys Compd., 2012, pp. 538–544.Google Scholar
  6. 6.
    Fragomeni, J., Wheeler, R., and Jata, K.V., Effect of single and duplex aging on precipitation response, microstructure, and fatigue crack behavior in Al–Li–Cu alloy AF/C-458, J. Mater. Eng. Perform., 2005, vol. 14, no. 1, pp. 18–27.CrossRefGoogle Scholar
  7. 7.
    Mondol’fo, L.F., Struktura i svoistva alyuminievykh splavov (Structure and Properties of Aluminum Alloys), Moscow: Metallurgiya, 1979.Google Scholar
  8. 8.
    Wang, M.J., Chen, L., and Wang, Z.X., Effect of rare earth addition on continuous heating transformation of a high speed steel for rolls, J. Rare Earths, 2012, vol. 30, pp. 84–89.CrossRefGoogle Scholar
  9. 9.
    Hunkeler, F. and Bohni, H., Mechanism of pit growth on aluminum under open circuit conditions, Corrosion (USA), 1984, vol. 40, no. 10, pp. 534–540.CrossRefGoogle Scholar
  10. 10.
    Foley, R.T., Localized corrosion of aluminum alloys, Corrosion (USA), 1986, vol. 42, no. 56, pp. 277–278.CrossRefGoogle Scholar
  11. 11.
    Chen, X.G., Growth mechanisms of intermetallic phases in DC cast AA1XXX alloys, Essential Readings in Light Metals. Vol. 3. Cast Shop for Aluminum Production, Wiley 2013, pp. 460–465.Google Scholar
  12. 12.
    Grange, D.A., Microstructure control in ingots of aluminium alloys with an emphasis on grain refinement, Essential Readings in Light Metals. Vol. 3. Cast Shop for Aluminum Production, Wiley, 2013, pp. 354–365.Google Scholar
  13. 13.
    Geoffrey, K., Sigworth fundamentals of solidification in aluminum castings, Int. J. Metalcast., 2014, vol. 8, no. 1, pp. 7–20.Google Scholar
  14. 14.
    Stark, B.V., Heating phenomena in muffle furnaces, Zh. Rus. Metall. Ob-va, 1926, no. 2, pp. 184–198.Google Scholar
  15. 15.
    Ivantsov, G.P., Nagrev metalla (teoriya i metody rascheta) (Heating of Metal (Theory and Methods of Calculation)), Sverdlovsk–Moscow: Metallurgizdat, 1948.Google Scholar
  16. 16.
    Bagnitskii, V.E., Obratnye svyazi v fizicheskikh yavleniyakh (Feedback in the Physical Phenomena), Germany: LAP (Lambert Acad. Publ.), 2014 (in Russian).Google Scholar
  17. 17.
    Zokirov, F.Sh., Ganiev, I.N., Berdiev, A.E., and Ibrokhimov, N.F., Temperature dependence of thermal capacity and thermodynamic functions of the AK12M2 alloy modified by strontium, Izv. SPbGTI (TU), 2017, no. 41 (67), pp. 22–26.Google Scholar
  18. 18.
    Ganiev, I.N., Mulloeva, N.M., Nizomov, Z., and Obidov, F.U., Temperature dependence of the specific heat and thermodynamic functions of alloys of the Pb–Ca system, High Temp., 2014, vol. 52, no. 1, pp. 138–140.CrossRefGoogle Scholar
  19. 19.
    Obidov, Z.R., Amini, R.N., Ganiev, I.N., and Nizomov, Z., Temperature dependence of thermodynamic properties of Zn–5Al and Zn–55Al alloys with magnesium, Orient. J. Chem., vol. 28, no. 2, pp. 841–846.Google Scholar
  20. 20.
    Ibrokhimov, N.F., Ganieva, N.I., Ibrokhimov, S.Z., Ganiev, I.N., and Nizomov, Z., Effect of cerium on the thermophysical properties of AMG2 alloy, Phys. Met. Metallogr., 2016, vol. 117, no. 1, pp. 49–53.CrossRefGoogle Scholar
  21. 21.
    Zinov’ev, V.E., Teplofizicheskie svoistva metallov pri vysokikh temperaturakh: Spravochnoe izdanie (Thermal Properties of Metals at High Temperatures: Reference Book), Moscow: Metallurgiya, 1989.Google Scholar
  22. 22.
    Lidin, R.A., Molochko, V.A., and Andreeva, L.L., Zadachi po neorganicheskoi khimii: Uchebnoe posobie dlya khimiko-tekhnologicheskikh vuzov (Tasks in Inorganic Chemistry: Educational Manual for Chemical-Technology Higher Schools), Lidin, R.A, Ed., Moscow: Vysshaya Shkola, 1990.Google Scholar
  23. 23.
    Ravdel’, A.A. and Ponomareva, A.M., Kratkii spravochnik fiziko-khimicheskikh velichin (Short Reference Book of Physicochemical Quantities), Ponomareva, A.M and Ravdel’, A.A, Eds., Leningrad: Khimiya, 1983.Google Scholar

Copyright information

© Allerton Press, Inc. 2019

Authors and Affiliations

  1. 1.Nikitin Institute of Chemistry, Academy of Sciences of the Republic of TajikistanDushanbeTajikistan
  2. 2.Umarov Physical-Technical Institute, Academy of Sciences of the Republic of TajikistanDushanbeTajikistan

Personalised recommendations