Grain Boundary Migration
Grain boundary migration is the movement of grain boundaries in metals during recrystallization or grain growth to reduce the total system energy. This can lead to deformation and changes in the material's conductivity.
Physicochemical Mechanism of Action
During recrystallization or grain growth in metals, grain boundaries move to minimize the total system energy. This process can be influenced by various factors such as temperature and stress.
Metallurgical Relevance & Welding Risks
Grain boundary migration can cause deformation in the material, affecting mechanical properties. It can also contribute to cracking or changes in material conductivity. Improper handling during welding can lead to reduced service life and reliability of components.
Workshop Practice & Action Guidelines
To minimize grain boundary migration, it is important to precisely control welding parameters such as temperature and stress. For metals with high grain growth, slow cooling may be recommended to prevent boundary migration. It is also advisable to consult a metallurgist for complex components or materials with special properties.