Shear Stress Induced Twinning
Shear-induced twinning is a deformation mechanism where crystal portions shift mirror-image-like to dissipate plastic energy. This occurs especially in fcc metals with low stacking fault energy.
Physico-Chemical Mechanism of Action
In shear-stress-induced twinning, crystal particles within a metal shift mirrored to relieve plastic energy. This process occurs at low temperatures or high strain rates and is especially common in fcc metals with low stacking fault energy.
Metallurgical Relevance & Risks in Welding
This twinning can lead to increased hardness and lower ductility of the weld. It can also cause cracks or deformations in the material if the welding processes are not properly designed.
Workshop Practice & Action Items
To minimize shear-stress-induced twinning, watch the correct welding temperature and strain rate. Use metals with higher stacking fault energy if possible. For highly loaded components, it is advisable to inspect the weld before use.