Interfacial Energy
Interfacial energy is the energy stored at the contact surface between two phases or crystallites. The system tends to minimize this energy.
Physico-Chemical Mechanism
Interfacial energy arises from the unequal attraction between atoms of different phases or crystallites. This unequal attraction leads to stress at the contact surface, which stores energy.
Metallurgical Relevance & Welding Risks
During welding, interfacial energy can cause phase transformations and the formation of dendrites. High interfacial energy can also make the material more deformable at the contact surface, leading to cracks or damage.
Workshop Practice & Action Items
To minimize the negative effects of high interfacial energy, it is important to ensure a clean weld and proper cooling. Avoid excessive welding temperatures and cool the material slowly to prevent the formation of dendrites and cracks.