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

Densities of solid Al and AI-Mg alloys were measured by the dilatometric me thod 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 temp erature (room temperature up to 800 K) was observed for all investigated al loys. Results are described by polynomials of the second degree. The molar volumes of AI-Mg alloys were calculated from the density measurements. it h as been found that the densities of solid AI-Mg alloys show negative deviat ions 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 bounda ry was calculated and is described by a temperature-dependent polynomial.