Welcome to Alloy Phase
The ASM Alloy Phase Diagram Database
allows subscribers to explore
more than 36,500 binary and ternary phase
and associated phase data for more than 6200 systems
from their Web browsers.
To get started, enter one or more elements in the boxes at the
top of the screen and click Go, or select Explore to
browse by elements and systems, or select Search
to build targeted queries.
Did you know?
The phase rule
, first announced by J. Willard Gibbs in 1876, relates the
physical state of a mixture to the number of constituents in the system and to its conditions. When pressure
and temperature are the state variables, the rule can be written as follows:
f = c - p + 2
is the number of independent variables that can be changed without changing the number of phases
present (called degrees of freedom
number of components, and p
is the number of stable phases. In binary phase diagrams, components are
the two materials plotted on the horizontal axis (e.g., silver and copper in the diagram shown).
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ASM Alloy Phase Diagram Database, P. Villars, editor-in-chief; H. Okamoto and K. Cenzual, section editors.
ASM International, Materials Park, OH, 44073, USA