Definition - What does Hypereutectoid Alloy mean?
A hypereutectoid alloy is a metal composed of two or more metallic elements in which the concentration of solute is greater than that of the eutectoid. In steel, such alloys display lower carbon contents. Hypereutectoid alloys are corrosion resistant.
Corrosionpedia explains Hypereutectoid Alloy
Eutectic reactions involve the coexistence in chemical equilibrium of a liquid and two solid solutions at a fixed temperature. This results in an alloy solid macrostructure formation. However, hypereutectic reactions have a smaller concentration of solid solution of one metal and a greater concentration of the other secondary metal in comparison to the parent eutectic mixture.
Therefore, a reduction in the system temperature will result in the precipitation of one component of the mixture. In industrial applications, the reaction is manipulated to ensure that the component with greater corrosion resistant properties is precipitated. Hence, the resulting structure results in an alloy with favorable characteristics such as heat, water and corrosion resistance. The resulting materials are ideal for coating applications.