Effect of high shear rate on solidification microstructure of semisolid AZ91D alloy
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 mierostructures obtained at high rotation speed are homogenous spherical and fine grains instead of dendritic or rosette and exhibits uniform distribution in the eutectic matrix.
semisolid high shear rate solidification AZ91 D rotation speed
ZHU Guang-lei XU Jun ZHANG Zhi-feng LIU Guo-jun Z. Fan
General Research Institute for Non-ferrous Metals, Beijing 100088, China Brunel Centre for Advanced Solidification Technology (BCAST), Brunel University, Uxbridge UB83PH, UK
国际会议
北京
英文
868-872
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）