Thermophysical Properties of Magnesium in Solid and Liquid States
R. N. Abdullaev, A. Sh. Agazhanov, A. R. Khairulin, Д. А. Самошкин, С. В. Станкус
Abstract
A number of thermophysical properties of pure magnesium are measured with high accuracy over a wide range of temperatures in the solid and liquid states. The enthalpy and isobaric heat capacity of magnesium are investigated over a temperature range of 431–1176 K with application of a massive high-temperature isothermal drop calorimeter. The estimated error in the data on enthalpy and heat capacity is 0.2% and 0.5%, respectively. The enthalpy of fusion of magnesium is 8455 ± 22 J/mol. The thermal conductivity and thermal diffusivity of solid and liquid magnesium are measured in the range of 291 K to 1221 K by the laser flash method. The errors in the thermal conductivity measurements are 2–5% for the solid state and 4–6% for the liquid one. It is shown that the thermal conductivity and thermal diffusivity of magnesium decrease about 1.5 times during melting. Our results are compared with data in the literature and with calculations based on the Wiedemann–Franz law. Approximation equations are constructed and tables of recommended values of the investigated properties of magnesium are presented for a temperature range of 291–1221 K for the condensed state.