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
3.1.1 Phase chemistry variables
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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.
...
Binary alloys containing Ag
Binary alloys containing Al
Binary alloys containing As
As-Cu (arsenic-copper – figure )
This diagram has recently been completely revised. The relationships between phases and their compositions are now well known; there are apparently no other intermediate phases richer in arsenic than those shown in the diagram.
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Phase structures
(Cu) : c. f. c....
Au-containing binary alloys
Binary alloys containing either B, Be or Bi
Binary alloys containing C
Binary alloys containing either Ca, Cd or Ce
Binary alloys containing Co
Binary alloys containing Cr
Binary alloys containing Cu
Binary alloys containing Fe
Binary alloys containing Li, Mg or Mn
Binary alloys containing either Mo, or N, or Nb, or Ni, or O
Binary alloys containing either Pb, Sb, Sn or Ti
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