Eutectoid and Peritectic Reactions

The eutectoid (eutectic-like) reaction is similar to the eutectic reaction but occurs from one solidphase to two new solid phases. It also shows as V on top of a horizontal line in the phase diagram. There are associated eutectoid temperature (or temperature), eutectoid phase, eutectoid and proeutectoid microstructures.

The peritectic reaction also involves three solid in equilibrium, the transition is from a solid +

liquid phase to a different solid phase when cooling. The inverse reaction occurs when heating.