Lattice vibration
Lattice vibrations are thermally induced oscillations of atoms in a crystal lattice that determine thermal conductivity.
Physicochemical Mechanism of Action
Lattice vibrations arise from the hot motion of atoms in the crystal lattice. These atoms move around their ideal equilibrium positions and transfer energy as heat.
Metallurgical Relevance & Risks in Welding
At high temperatures, lattice vibrations increase, raising thermal conductivity. This can lead to rapid cooling and the development of cracks or hot cracks if the material cools too quickly. Additionally, they affect melting processes and can lead to uneven distortion.
Workshop Practice & Action Guidelines
To control lattice vibrations, ensure uniform cooling. Use coolants like water or airflow to regulate the temperature drop. For critical weld joints, it is important to precisely maintain the critical temperature range (e.g., t8/5) to avoid cracks and hot cracks.