Density and Thermal Expansion of Magnesium–Calcium Alloys in Solid and Liquid States

Experimental studies of the volumetric properties of the Mg 2 Ca intermetallic compound and eutectic magnesium–calcium alloys (with compositions of 10.5 and 73 at.% calcium) in the temperature range of 100 K to 1230 K of the solid and liquid states were carried out using the gamma-ray attenuation technique and the dilatometric method. Measurements of the density and volumetric thermal expansion coefficient of Mg–Ca melts, as well as the density change during melting-crystallization, were performed for the first time. The concentration dependences of the volumetric properties of the Mg–Ca system and approaches for calculating density and thermal expansion coefficients of promising magnesium–calcium alloys are proposed.