Monotectic solidification reaction
Monotectic solidification reaction: A liquid phase splits upon cooling into a solid phase and a second liquid phase.
Physical-Chemical Mechanism of Action
In the monotectic solidification reaction, a liquid metal phase condenses into a solid crystal lattice during cooling. Simultaneously, a second, different liquid phase forms due to the splitting of the original phase.
Metallurgical Relevance & Risks in Welding
This reaction can lead to uneven cooling and distortion. The resulting second liquid phase can cause porosity if not cooled properly. This increases the risk of cracks and reduces weld strength.
Workshop Practice & Instructions
To control the monotectic solidification reaction, ensure even cooling. Use suitable coolants and avoid rapid cooling steps. For highly susceptible materials, continuous cooling or the use of cooling gases may be necessary.