TEMPERATURE DEPENDENCE OF HEAT CAPACITY AND THERMODYNAMIC FUNCTIONS OF ALUMINUM ALLOY AlMg5.5Li2.1Zr0.15 OF DURALUMIN TYPE ALLOYED WITH PRASEODYMIUM

The specific heat capacity of the aluminum alloy AlMg5.5Li2.1Zr0.15 of the duralumin type with praseodymium was investigated in the "cooling" mode using the known heat capacity of the reference sample of aluminum grade A5. Using the experimentally found values of the rates of cooling alloy samples and a standard, knowing their masses, the polynomials of the temperature dependence of the heat capacity of the alloys were established, which are described by a four-term equation. Using the integrals of the specific heat capacity, the polynomials of the temperature dependence of changes in enthalpy, entropy, and Gibbs energy for the aluminum alloy AlMg5.5Li2.1Zr0.15 of the duralumin with praseodymium type were determined. The obtained dependences show that with increasing temperature, the heat capacity, enthalpy, and entropy of the alloys increase, and the value of the Gibbs energy decreases. An increase in the praseodymium content reduces the heat capacity, heat emission coefficient, enthalpy, and entropy of the aluminum alloy AlMg5.5Li2.1Zr0.15 of the duralumin type.

Author:  I. N. Ganiev, S. U. Khudoyberdizoda, S. S. Savdulloeva, J. H. Jayloev, and Kh. M. Khojanazarov
Keywords:  aluminum alloy AlMg5.5Li2.1Zr0.15 of duralumin type, praseodymium, "cooling" mode, specific heat capacity, heat emission coefficient, thermodynamic functions
Page:  764