On the nearest neighbour interaction model with a concentration dependent interaction energy

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Abstract
In order to apply to alloy systems with asymmetric thermodynamic properties, the nearest neighbor interaction model must have a concentration dependent interaction energy. At least one new parameter is then introduced which can be used to make experiment agree with theory. The three systems Au-Ni, Al-Zn and Al-Ag are examined on this basis. In the Al-Ag system the concentration dependence is very strong. As a consequence the phase diagram contains a metastable miscibility gap and a metastable ordering region which overlap each other. This may explain how two types of zones can form during age-hardening in this system