Home – Home – Jornals – Thermophysics and Aeromechanics 2025 number 2

The thermal diffusivity (α) of solid magnesium-lithium alloys with lithium contents X_Li = 5, 10, 17, 21, and 25 at. % was measured using a laser flash method in the temperature range of 300 - 680 K. Based on the experimental results, the thermal conductivity (λ) of alloys was calculated and compared with the literature values for λ of other compositions. The estimated uncertainties of the obtained data were 3.0 - 3.4 % for λ and 2.0 - 2.4 % for α. It is shown that the addition of lithium to magnesium reduces significantly its thermal conductivity, with a more pronounced decrease in λ observed as the Li concentration approaches X_Li = 32 at. %. Anomalous features in the form of bends in the temperature dependences λ(T) and α(T) were identified for the Mg₉₅Li₅ and Mg₇₅Li₂₅ alloys within the temperature range of 310 - 330 K, similar to the behavior reported for the Mg₇₀Li₃₀ alloy. Using the calculated data and literature sources, the concentration dependences of thermal conductivity for the Mg-Li system were plotted over the composition range X_Li = 0 - 32 at. %.