Numerical Simulation Research On Casting Process Of Particle Reinforced Aluminum Matrix Composites

Metal matrix composites characterized by high specific modulus,high strength,good isotropy and good wear resistance compared to unreinforced matrix alloys,has been widely applied in the fields such as airspace,transportation and electronic packaging.There are little restriction in Reinforced particle,and stirring casting method operates simply and create a variety of complex shapes of parts directly.In the process of casting filling,the flow behavior of the melt has an important effect on the particle distribution,and the particle distribution determines the final performance of the casting.It is necessary to study the characteristics of the flow in SiCp/Al composites.In this paper,numerical simulation is used to study the casting filling law of SiCp/Al composites.The experimental materials are obtained by mechanical stirring dispersion method,and the viscosity data obtained by the experiment.Firstly,the equivalent material method was used to study the filling fluidity of SiCp/Al composites under different conditions by ProCAST.Then,by the theory of multiphase flow,ANSYS Fluent software was used to explore the distribution of the enhanced phase in the melt during the filling flow.The results show that the pouring temperature increased to 680? after pouring temperature on the impact of liquidity significantly reduced.At different mold temperatures,the cooling rate has a negative correlation with the mold temperature.The cooling rate of SiCp/Al composites during solidification will affect the distribution of SiC particles in the matrix.The relatively uniform distribution of matrix structure can be obtained at higher cooling rate.It is found that the SiCp volume fraction increases as the flow length increases,up to 120%,then the SiC particles volume fraction decreases with the flow length at the front position.And The SiC Particles distribution in flow length direction shows little difference among the 5%to 25%volume fraction.In the process of moving the inner wall of the particles have some adsorption and capture effect.And SiC Particles tends to exhibit a gradient distribution in the direction of gravity.