What Is a Eutectic?

Eutectic means that a certain composition of alloy liquid is cooled, solidified, and crystallized into a mixture of two or more dense crystals at the eutectic reaction temperature. Simple binary alloys can be represented by the general formula La + . The alloy structure deviating from the eutectic composition is hypoeutectic or hypereutectic. The eutectic adopts inter-excitation nucleation.The dendritic pre-eutectic structure is first precipitated from the liquid, and then the liquid between the dendrites is solidified to form the eutectic structure, which is grown alternately by branching and bridging to form a lamellar shape. And grow up, the typical eutectic structure is lamellar or rod-shaped; the epiphytic structure is strip-shaped, dot-like, or helical; the atypical eutectic is two independent nucleus interface crusts are related to the growth mode, there are primary Phases are prone to divorced eutectics, that is, one phase in the eutectics grows around the primary phase, the eutectic alloy has a low melting point, is easy to flow and cast, and has poor pressure processing and welding performance and good cutting performance. ^[1]

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Eutectic is the fusion of all components at a temperature below the melting point of the metal of either composition. In most cases, the melting point of the constituent metal in the eutectic alloy differs from its melting point in the pure metal state by 100 ° C.

Related to eutectic are peritectic, hypoeutectic and other terms, generally used in heat treatment industry, metallurgical industry, silicate industry and so on.

The eutectic alloy has a specific freezing point, which is the most significant difference from other non-eutectic alloys.