Intermetallic Compound
Intermetallic phases are hard and brittle compounds of two metals with fixed stoichiometry and their own crystal structure. They form by diffusion in the heat-affected zone during welding.
Physical-Chemical Mechanism of Action
Intermetallic phases form by the diffusion of atoms from different metals that exchange in the heat-affected zone during welding. These compounds have a fixed chemical composition (stoichiometry) and develop their own crystal structure.
Metallurgical Relevance & Welding Risks
Intermetallic phases can impair the mechanical properties of a weld. They are usually very hard and brittle, which can lead to cracks and fractures. In addition, they can reduce formability and make the structure uneven.
Workshop Practice & Action Instructions
To minimize intermetallic phases, the following measures should be taken:
• Use suitable welding methods and materials that have low susceptibility to such phases.
• Ensure that the heat-affected zone is kept as short as possible to limit diffusion.
• Use shielding gas or other deoxidizing agents to ensure a homogeneous composition in the structure.