In the current work, the morphological evolution and mechanical properties of the
solidification structures of stirred ZA-12 zinc alloy has been investigated. The alloy was mechanically stirred in the solidification range. During stirring, the solid/liquid ratio inside the molten slurry was 50/50. The effect of shearing intensity and shearing time on the structure and mechanical characteristics of the alloy was evaluated. The results showed that both shear intensity-time combination have significant influence on the primary particles morphology. It has been showed that low shearing intensity produces coarse solidification structure while high shearing intensity produces fine non-denderitic solidification structure. Increasing the shearing time above a critical value causes the primary particles to agglomerate and form a rosette like structure. Rheocast alloys with fine structure exhibited better mechanical properties when compared with alloys having other denderitic structure or rosette structure.


Effect of tool rotational and welding speeds on microstructural and mechanical characteristics of friction stir welded A319 cast Al alloy - ResearchGate. Available from: http://www.researchgate.net/publication/233601861_Effect_of_tool_rotational_and_welding_speeds_on_microstructural_and_mechanical_characteristics_of_friction_stir_welded_A319_cast_Al_alloy