P.E.D

Phase Equilibrium Diagrams:-

Phase equilibrium diagram is a graphic relationship between
temperature and weight ratios of elements and alloys contribute to the built of the diagram.

Phase diagrams provide information on the following :
• Melting point .
• Casting condition .
• Crystallization condition .
• phase transformations (changes).

Phase is a uniform part of an alloy, and a homogeneous aggregation of mater having a certain chemical composition and structure, and uniform physical and chemical and mechanical properties.
and which is separated from other alloy constituents by phase boundary.

Every one notes that H2O can exit as a gas, a liquid and a solid. These are three different phases of water .

solvent: component of a solution present in the greatest amount in alloy .

solute: component or element of solution present in lowest concentration in alloy .

Solubility Limit :- max. concentration of atoms to be dissolved in
the solvent to form a solid solution.

example solubility of sugar in water.

For example the salt – water solution have a four possible phases:
- Water vapor (steam)
- Liquid salt solution (sodium chloride in water)
- Crystals of water (ice).
- Crystals of salt (sodium chloride).