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 three types of equilibrium are stable, metastable, and unstable.
From a thermodynamic standpoint, an alloy at equilibrium is at the bottom of a free energy "well."
However, there may be many such wells that a system could be in depending on the phases it contains.
If it is in the lowest possible well, then it is in stable equilibrium. If it is in a higher well then
it is in metastable equilibrium. The system can be in a metastable state for a short time (nanoseconds)
or a long time (millions of years). It all depends on the time needed to nucleate and form a more stable
phase or phases. Rapid freezing is a common method of producing metastable structures, but some
(such as Fe3
C, or "cementite") are produced at moderately slow cooling rates.
The diagram shows both stable (solid lines) and metastable (dashed lines) equilibrium in the C-Fe system.
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ASM Alloy Phase Diagram Database, P. Villars, editor-in-chief; H. Okamoto and K. Cenzual, section editors.
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