Partial solubility

The partial solubility equilibrium diagram is derived from the previous two diagrams that indicated soluble and insoluble states. Few alloys exhibit total insolubility or total solubility and many metals combine to form a partial solubility system. The ends of the totally soluble system are amalgamated with the central portion of the insoluble or eutectic system to form the partially soluble in the solid state equilibrium diagram as shown here.
 
 

The partial solubility diagram looks very different to what we have encountered so far so we will work on its various components before we move on to seeing its uses.

Lines "ae" and "eb" (grey) are the liquidus lines. Lines "ac" and "bd" (maroon) are the Solidus lines.  Two new lines exist in this diagram "cf" and "dg" (in blue) and these are the Solvus lines which show the solubility of the two metals in each other.

Click here to see how this diagram is created.
 
 
 
 

Lead and Tin combine to form solder and the equilibrium diagram is shown below. On this diagram I have included drawing of a typical microstructure for six different alloys of Lead and Tin these microstructures are fairly self explanatory further explanations can be gotten by clicking on the relevant microstructure in the diagram.

Congradulations you are now ready to move on to the last type of alloy combiation known as Intermetallic Compounds

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