Eutectic phase coexistence
Eutectic phase coexistence: two or more solid phases crystallize simultaneously from a liquid phase at a constant temperature. This is typical for certain alloys.
Physical-Chemical Mechanism of Action
In eutectics, an alloy crystallizes from a liquid phase into two or more solid phases simultaneously when it reaches a specific temperature. This temperature is invariant and remains constant during crystallization.
Metallurgical Relevance & Welding Risks
Eutectics can lead to complex structures that are neither strong nor soft. This can cause difficulties in weld formation and strength. Mishandling can lead to uneven stresses and cracks.
Workshop Practice & Handling Instructions
When welding alloys with eutectics, precise temperature control is crucial. Use a stabilized melting temperature and ensure uniform cooling. If needed, a post-weld heat treatment such as austenitizing can be applied to homogenize the structure.