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| An
invariant reaction for a binary alloy is one occurring when three phases
are in equilibrium. Application of the Gibbs phase rule to this system
under constant pressure conditions indicates that it has no degrees of
freedom and, therefore, the composition of the phases and the temperature
of the reaction are all fixed.
Eutectic, peritectic, monotectic, peritectoid and eutectoid reactions are all invariant and take place at an invariant temperature for the system. |
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