On microstructural refinement of an AA7449 aluminium alloy through shearing above liquidus temperature

Applying mechanical shearing by melt conditioner machine at above liquidus temperature was carried out. The experimental results show fine and uniform structure can be acquired across the sample. Further, shearing degasses the melt through cavitation effect. The achieved results indicate an alternative process for refining structures.

► Effects of liquid shearing on AA7449 aerospace alloy. ► Extensive grain refinement by the process. ► Improvement in degassing the melt. ► Fine and uniform structure across the sample was acquired.