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The invariant reaction involving a solid phase decomposing into two different solids on cooling is known as _______

A eutectoid reaction is a three-phase reaction by which, on cooling, a solid transforms into two other solid phases at the same time.

The location on a phase diagram indicating the eutectoid composition and eutectoid temperature of an alloy is called a Eutectoid point.

or

The invariant reaction involving a solid phase decomposing into two different solids on cooling is known as Eutectoid point.

The eutectoid invariant reaction is a solid-state version of the eutectic reaction and in general, can be represented by an equation:

S1 $_{\overrightarrow {Cooling} }$ S1 + S2

where, S1, S2 and S3 are three different solids each of fixed composition.