Thermal conductivity of magnesium-lithium alloys with a body-centered cubic crystal lattice in the temperature range of 80 - 350 K
V.A. Nepomnyashchikh, R.N. Abdullaev
Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia
Keywords: transient plane source method, magnesium-lithium alloys, thermal conductivity, phase transitions
Abstract
Thermal conductivity of solid magnesium-lithium alloys with XLi = 35, 40, 50 at. % in the temperature range of 80 - 350 K was measured by a transient method using a plane heat source. The obtained results were compared with literature data for alloys of other compositions. For all the studied alloys, anomalous behavior in the form of a kink in the range of 310 - 330 K and a feature near 240 K, presumably associated with a martensitic transformation, was found on temperature dependences λ(T). Using literature data, concentration dependences of thermal conductivity of the Mg-Li system were plotted in the range XLi = 0 - 50 at. %. It is shown that an increase in the lithium content in the range of 30 - 50 at. % leads to a further decrease in thermal conductivity.
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