Peculiarities of the Eutectic Mg–Li Alloy Thermal Expansion, Heat Capacity and Thermal Conductivity Behavior in the Temperature Range of 80 K to 293 K

• Published in: International journal of thermophysics 2023-07, Vol.44 (7), Article 104
• Main Authors: Abdullaev, Rasul N., Kozlovskii, Yurii M., Samoshkin, Dmitrii A., Stankus, Sergei V., Agazhanov, Alibek Sh
• Format: Article
• Language: English
• Subjects: Alloys; Classical Mechanics; Condensed Matter Physics; Dilatometry; Elongation; Eutectic alloys; Eutectic temperature; Geophysics; Heat conductivity; Heat transfer; Industrial Chemistry/Chemical Engineering; Lithium; Magnesium base alloys; Martensitic transformations; Phase transitions; Physical Chemistry; Physics; Physics and Astronomy; Specific heat; Thermal conductivity; Thermal expansion; Thermodynamics
• ISSN: 0195-928X; 1572-9567
• DOI: 10.1007/s10765-023-03212-3

Experimental studies of the thermal expansion, heat capacity and thermal conductivity of the eutectic magnesium–lithium alloy (with composition of 23.0 at.% lithium) were performed in the temperature range of 80 K to 400 K. The relative elongation and thermal expansion coefficient of this ultralight magnesium–lithium alloy were measured by the dilatometric method using a DIL-402C setup. Measurements of the heat capacity were carried out by the differential scanning calorimetry using a DSC 404 F1 setup. Investigation of the thermal conductivity was performed by the hot-disk technique using a Hot-Disk TPS 2500S setup. The temperature dependences were constructed and tables of recommended values of the investigated properties were presented. It was found that in Mg 77 Li 23 alloy a phase transition occurs in the range of 223 K to 253 K, where the heat capacity and the linear thermal expansion coefficient change abruptly. This transition is presumably related to the martensitic transformation of the lithium-rich bcc magnesium–lithium alloys to the hcp structure.