Phase Diagram
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Phase Diagram
EUTECTOID AND PERITECTIC REACTIONS
The Eutectic Reaction
The Peritectic Reaction
• Examples: Cu-Zn, Fe-C, Ag-Pt
The Eutectoid Reaction
• Examples: Fe-C, Cu-Zn
The Peritectoid Reaction
• Examples: Ag-Al, Al-Cu
The Monotectic Reaction
• Examples: Cu-Pb
THE GIBBS PHASE RULE• This rule represents a criterion for the number of
phases that will coexist within a system at equilibrium, and is expressed by the simple equation
• P is the number of phases present• F is termed the number of degrees of freedom or the number
of externally controlled variables (e.g., temperature, pressure, composition)
• C is the number of components in the system.• N is the number of non compositional variables (e.g.,
temperature and pressure).