Enthalpy and numerical simulation of phase transitions in a $\mathrm{Zr}$–$\mathrm{C}$ system

An approximate method for calculating the enthalpy of a $\mathrm{Zr}$–$\mathrm{C}$ system in a wide range of state parameters (including the liquid phase) is proposed. The dynamics of phase transitions upon laser heating of $\mathrm{Zr}$–$\mathrm{C}$ samples is simulated numerically based on the results of calculating enthalpy. Typical calculated thermograms of heating and cooling are presented; they demonstrate the possibility of identifying the phase-transition temperatures in experiments with laser heating from characteristic features of the thermograms.