The excess volume and density of liquid Al –Sr alloys at 1323, 1423 and 1523 K have been evaluated from the enthalpy of mixing and the excess entropy, using the solution model based on the free-volume theory. It has been found that the excess volume of liquid Al –Sr alloys exhibits a minimum at xSr ≈ 0.31, well consistent with the thermodynamic results that both the enthalpy of mixing and excess entropy exhibit minima at xSr ≈ 0.35. By contrast, the density of liquid alloys shows a maximum at xSr ≈ 0.31. The excess volume and density, in combination with the thermodynamic properties and the phase diagram, suggest the presence of complexes of the type Al2Sr in liquid Al –Sr alloys. The excess volume and the density of liquid alloys slightly decrease with increasing temperature.
The authors gratefully acknowledge the support of the National Natural Science Foundation of China (No. 50071028) and the Shandong Natural Science Foundation of China (No. Z2001F02).
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