MSE 2001 Phase Diagrams
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9 Terms
Phase
Portion of the material that is homogenous in the structure and chemical makeup. e.g. gas, liquid, crystalline solid
Component
Elements or stoichiometric compounds which are chemically distinct and used to specify the composition(chemical makeup) of a material.
unary
H2O, NaCl, and pure Fe are examples of _____ systems?
binary
Fe+C and Ni+Cu are examples of ____ systems.
Degrees of Freedom (F)
Number of variables (T, P, and if relevant Composition) one must specify to completely define the equilibrium state of a system.
Gibbs Phase Rule
F(deg of Freedom) = C(# of components) - P(# of phases) +2
2
For a binary system, C = __? (e.g. elements or stoichiometric compounds A&B)
Binary Isomorphous Phase Diagram
Simplest binary phase diagram. Complete mixing or miscibility of the two components occurs(forms ideal substitutional solid solution to generate same crystal structure often designated as alpha, beta, or gamma) at all compositions.
Must follow Hume-Rothery rules.
Equilibrium Solid phase is a crystal
most thermodynamically favorable state, crystal
