Density and molar volume of Al-rich Al-Li-Mg solid alloys

Using the dilatometric method the densities of the solid Al-Li-Mg alloys were measured for two constant values of t = 0.85 and 0.95, where t = X-AI/(X-AI + X-Mg) and for Li concentrations changing from 0 to 0.25 mole fraction. The experiments were carried out in the temperature ranges: 293-818 K and 293-718 K for t = 0.05 and 0.15, respectively. The temperature dependences of density were described by the parabolic equation of the form y = a + bT + cT(2). The parameters a, b, and c were calculated using the least squares method. It was found that the density isotherms for t = 0.95 show slight negative deviation from the linear behaviour, while for t = 0.85 an almost linear change is observed when plotting the density from Al-Mg alloys to pure Li density. The molar volume isotherms of Al-Li-Mg solid alloys calculated at the same temperatures as for the density are characterised by slow decreasing with the increase of Li content, except that calculated at 700 K for t = 0.85 showing an opposite trend.