Effect of high shear rate on solidification microstructure of
semisolid AZ91D alloy
semisolid AZ91D alloy
(1. General Research Institute for Non-ferrous Metals, Beijing 100088, China;
2. Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University, Uxbridge UB83PH, UK)
2. Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University, Uxbridge UB83PH, UK)
Abstract: To investigate the effects of rotation speed and shearing time on morphology of semisolid AZ91D alloy, experimental work was undertaken using a twin-screw slurry maker. The results show that increasing the rotation speed and reasonable time can give rise to substantial grain refinement during continuous shearing stage, which can be attributed to the increasing of effective nucleation rate caused by the extremely uniform temperature due to high shear rate and high degree of turbulence. Comparing with low rotation speed at the same thermal condition, the analysis indicates that the microstructures obtained at high rotation speed are homogenous spherical and fine grains instead of dendritic or rosette and exhibits uniform distribution in the eutectic matrix.
Key words: semisolid; high shear rate; solidification; AZ91D; rotation speed