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What is the eutectic reaction? What is the eutectoid reaction?

What is the eutectic reaction? What is the eutectoid reaction?

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Eutectic Reaction

A eutectic reaction is a special type of phase reaction - a three-phase reaction process in which a liquid solution that is cooled to the eutectic temperature results in two solid phases occurring at the same time.

Eutectoid Reaction

The eutectoid (eutectic-like) reaction is similar to the eutectic reaction but occurs from one solid phase to two new solid phases. It also shows as V on top of a horizontal line in the phase diagram.

Solid Phase 1 = Solid Phase 2 + Solid Phase 3

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