Effect of Calcium on the Temperature Dependence of the Heat Capacity and Thermodynamic Functions Variability of the AK12M2 Alloy

Resumo

The temperature dependence of the heat capacity, the heat transfer coefficient, and the change in the thermodynamic functions (enthalpy, entropy, and Gibbs energy) of AK12M2 alloy modified by calcium has been studied in the “cooling” mode. The heat capacity of alloys has been measured on a set-up based on the C-calorimeter method with a heat meter and an adiabatic shell. The results of the study showed that, in the temperature range of 300–550 K, the heat capacity increases by 20.1–21.4% for AK12M2 alloy modified with 0.1–1.0 wt % calcium. As the calcium content increases, the heat capacity of the initial alloy decreases by 4.86–6.41%.