Improving Particle Distribution Uniformity of the Semisolid-state-stirring Prepared B4Cp/A356 Composites by Applying a Geometrically Optimized Stirring Apparatus
ZHANG Xuefei1, BAI Jingyuan1, GUAN Renguo2, LIU Yan3, ZHOU Tianguo1
1 School of Mechanial & Engineering, Shenyang University, Shenyang 110044 2 School of Materials Science and Engineering, Northeastern University, Shenyang 110819 3 School of Metallurgy, Northeastern University, Shenyang 110819
Abstract: The present work aimed to evaluate the performance of a geometrically optimized stirring apparatus designed for the semisolid state stirring preparation of particle-reinforced aluminum matrix composite, from the perspective of improving particle distribution uniformity. We simulated the flow field of the material system during the semisolid state stirring of B4Cp/A356 composite by using the FLUENT software while applying the stirring apparatus model with the optimized geometric parameters. We then prepared B4Cp/A356 aluminum ingots using ordinary stirring apparatus and geometrically optimized stirring apparatus, respectively, and analyzed both macroscopically and microscopically the distribution of B4C particles in the matrices. The simulation and analysis results showed that the geometrically optimized stirring apparatus can generate an inconstant velocity intersect vortex beneficial to the dispersion of B4C particles when agitates in the semisolid state aluminum liquid (SSAL). The dual-layer pair-pushing orthogonal paddle with a blade tilt angle of 60° leads to a larger contact area between the blade and the SSAL, and in consequence, contributes to more uniform distribution of B4C particles in the lower part of aluminum matrix.
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2019, Vol. 33 
