Eutectic System
Eutectic is an alloy composition where, from a liquid phase, two solid phases solidify simultaneously. This occurs at a fixed, lowest possible temperature.
Physicochemical mechanism of action
In a eutectic, there is a specific composition of metals or alloys at which two different solid phases solidify simultaneously from a liquid phase. This process occurs at a fixed temperature known as the eutectic temperature.
Metallurgical relevance & risks in welding
Eutectics can cause specific microstructural problems in welding. If the composition and temperature conditions are exactly at the eutectic temperature, unwanted phase forms can develop, which can impair the mechanical properties. This can lead to cracks or brittleness.
Workshop practice & instructions
To avoid eutectic problems, it is important to control the composition and temperature conditions precisely. If the eutectic temperature is known, make sure the weld does not stay in that specific temperature range. This can be achieved by careful selection of materials and welding parameters.