Densities of solid aluminum-magnesium (Al-Mg) alloys

Densities of solid Al and AI-Mg alloys were measured by the dilatometric method for seven compositions at mole fractions of magnesium: 0.015, 0.05, 0.1, 0.125, 0.15, 0.20, and 0.25, A curvilinear dependence of density on temperature (room temperature up to 800 K) was observed for all investigated alloys. Results are described by polynomials of the second degree. The molar volumes of AI-Mg alloys were calculated from the density measurements. it has been found that the densities of solid AI-Mg alloys show negative deviations from linearity and the molar volumes exhibit positive deviations from ideal behavior for all samples in the experimental concentration range, The density of the beta(Al3Mg2) phase along the (alpha(Al) + beta)/beta boundary was calculated and is described by a temperature-dependent polynomial.