Alloy Phase Diagram Database™
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Welcome to Alloy Phase Diagram Database™

The ASM Alloy Phase Diagram Database allows subscribers to explore, search and view more than 36,500 binary and ternary phase diagrams 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.

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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

where f is the number of independent variables that can be changed without changing the number of phases present (called degrees of freedom), c is the 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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To learn how you or your facility can obtain access rights, contact Denise Sirochman at or 440.338.5409

ASM Alloy Phase Diagram Database, P. Villars, editor-in-chief; H. Okamoto and K. Cenzual, section editors.

ASM International, Materials Park, OH, 44073, USA