Université de Toulon et du Var Laboratoire de Physico-Chimie du Matériau et du Milieu Marin, Matériaux à Finalité Spécifique (E.A. 1356) B.P. 132 83957 La Garde cedex France B.P. 132 83957 La Garde cedex France
The first part of this paper presented five experimental isopletic cuts in the Al-Zn-Ga ternary phase diagram. On these cuts,
two isobaric ternary invariant reactions were determined and a significant retrograde miscibility of Ga in a α′SS solid solution was observed.
In the second part, the two isobaric invariant reactions are studied more precisely. In particular, the composition of the
invariant phases are given and the Ga miscibility in the αSS ternary solid solution is studied. Isothermal sections are established. The results confirm the existence of a vanishing
point in the liquidus area, conjugated with a ternary critical point at about 290C. A general perspective shape of the equilibria
in the diagram is proposed.