Microstructure evolution of Al-Si semi-solid slurry by gas bubble stirring method  

作　　者：张磊 董选普 李继强 李侃 张宗奎 王文俊 樊自田 

机构地区：[1]State Key Laboratory of Material Forming and Mould and Die Designing, Huazhong University of Science and Technology [2]School of Mechanical and Energy, Ningbo Institute of Technology, Zhejiang University

出　　处：《Journal of Central South University》2011年第6期1789-1794,共6页中南大学学报（英文版）

基　　金：Project(50775085)supported by the National Natural Science Foundation of China;Project(M2009061)supported by Special Fund for Basic Research and Operating Expenses of Central College,China;Project(2008A610049)supported by the Natural Science Foundation of Ningbo City,China

摘　　要：A novel technique of introducing gas bubble stirring during solidification was studied to prepare Al-Si semi-solid slurry. The microstructure evolution of the slurry during slow cooling process after stirring was investigated. The effects of the solidification rate on the microstructure of the semi-solid slurry were investigated under three different solidification conditions. The results show that fine non-dendritic slurry can be obtained using the gas bubble stirring method. Ripening and coarsening of primary Al grains are observed during the slow cooling process, and at last coarsened eutectic Si appears. Primary Al grains with different sizes and eutectic Si are obtained, corresponding to three different solidification rates.A novel technique of introducing gas bubble stirring during solidification was studied to prepare Al-Si semi-solid slurry. The microstructure evolution of the slurry during slow cooling process after stirring was investigated. The effects of the solidification rate on the microstructure of the semi-solid slurry were investigated under three different solidification conditions. The results show that fine non-dendritic slurry can be obtained using the gas bubble stirring method. Ripening and coarsening of primary Al grains are observed during the slow cooling process, and at last coarsened eutectic Si appears. Primary Al grains with different sizes and eutectic Si are obtained, corresponding to three different solidification rates.

关 键 词：gas bubble stirring semi-solid slurry solidification rate MICROSTRUCTURE 

分 类 号：TG146.21[一般工业技术—材料科学与工程]