Describing a solid mixture that forms from cooling at a specific temperature, similar to eutectic but occurring in the solid state rather than liquid.
From eutectic + '-oid' (resembling, having the form of). Describes a process similar to eutectic but in solid transformations.
Eutectoid transformations in steel are invisible magic—when iron and carbon cool at just the right temperature, they reorganize into different crystal structures, completely changing the metal's hardness and strength.
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