3. Gibbs phase rule and lever arm rule
In this section, we group together two rules of unequal importance. Gibbs' phase rule is universal in scope, and enables us to count the coexisting phases in a system of any multiplicity, in relation to the number of degrees of freedom in that system. The second rule, known as the lever arm or inverse segment rule, applies only to binary systems, and is a geometric image of the mass balance of the two phases in a two-phase domain.
3.1 Gibbs phase rule
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Gibbs phase rule and lever arm rule
Phases in metal alloys
Diagram classification
In this folder, the diagrams are arranged in alphabetical order of the symbol of the element concerned, which comes first in alphabetical order among the elements making up the alloy; then, for a given element, in alphabetical order of the symbol of the second element.
Example
we find Fe-C to C-Fe.
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