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Phase Diagrams

Equilibrium Phase Diagrams contain recorded thermal changes which takes place in alloys ie from liquid to a solid structure. The example shown is of a complete - solid solubility, which would appear to be 'single phase' when solidification has completed. These liquid and solid phases are defined as separate regions that differ from one another.

Elements are combined in a certain way when solidification takes place during cooling. At a temperature of 1500 degree C the metal is liquid, during the cooling effect at 1083 degree C the liquid metal changes into a solid state. During this cooling phase, recordings of the effects are taken until solidification ceases and the metal is at room temperature.

You will note that as the chemical's composition changes from liquid to solid, the range changes being lower when small amounts of nickel are added and higher when larger amounts are added.

It is important to take these recordings to understand the changes of the casting temperature for an alloy composition.

The microstructure of this alloy, when examined under a microscope, would be a 'single phase' with no dendrites. In other alloy systems which use copper, for example with zinc, can have 3 different phases and have dendrites, depending on the chemical composition and cooling rate.

Phase Diagrams is one of the elements you will learn during the Metallurgical Science 1 course.

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