Heat Capacity and Thermodynamic Functions of the Aluminum Alloy AlCu4.5Mg1 Alloyed with Barium

The results of the experimental determination of the heat capacity of the aluminum alloy AlCu4.5Mg1 alloyed with barium and the calculation of the temperature dependences of changes in the thermodynamic functions of this alloy are presented. Studies of the temperature dependence of the heat capacity of the AlCu4.5Mg1 alloy alloyed with barium are carried out in the cooling mode using a computer and the Sigma Plot 10.0 software. The types of polynomials of the temperature dependence of the heat capacity and changes in thermodynamic functions (enthalpy, entropy, and Gibbs energy) of the studied alloy and the standard (Al grade A5N), which describe these changes with the correlation coefficient Rcor = 0.999, are established. It is shown that with the increasing barium content, the heat capacity of the original alloy decreases. The enthalpy and entropy of the AlCu4.5Mg1 alloy alloyed with barium increase with increasing temperature, and decrease with the increasing barium content. The Gibbs energy values have an inverse relationship.