Mutual solid solubility of the component metals in alloy systems

1 Mutual solid solubility of the component metals in alloy systems 

The systems V-Mo and Cs-Rb presented in Fig. 2.1 are a first example of phase diagrams. 

The first system concerns refractory (high melting) alloys, the second one very low melting (close to room temperature) alloys. However, both diagrams are representative of the melting behaviour of binary systems in which the two components are mutually and completely (in all proportions) soluble with each other in the liquid and in the solid state. 

The composition/temperature field is subdivided into three regions, as for instance in Fig. 2.1(a), at low temperature there is a single phase field (S) where all the temperature and composition values are collected for which only one solid phase is stable (a continuous solid solution field between Mo and V). 

In a similar way, another single-phase field (L) exists at high temperature the two components show, indeed, a mutual complete solubility in the liquid state also. 

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