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
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A congruent reaction
is an isothermal reversible reaction in which both of the phases concerned have the same composition throughout the process. In the Ni-Ti system, two congruent reactions occur: L ? TiNi3
at 1380 °C and 25 at.% Ti, and L ? TiNi ht at 1310 °C and 50 at.% Ti. Other examples of congruent transformations include allotropic transformations and melting of pure metals. An incongruent reaction is one in which at least one of the phases experiences a change in composition, such as the eutectic reaction L ? TiNi3
+ TiNi ht at 1118 °C and 39 at.% Ti.
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