Numerical Simulation and Experimental Study on Al-60Si Alloy by Centrifugal Casting
High-silicon aluminum alloy has become the most promising metal-based electronic packaging material due to its excellent physical and chemical properties,such as low coefficient of thermal expansion,low density,and good thermal conductivity.However,conventional preparation methods for high-silicon aluminum alloys,such as powder metallurgy,result in low density,the formation of pores,coarse microstructure,and high cost during alloy preparation.This paper took Al-60Si ultra-high-silicon aluminum alloy as the research object and used the ProCast numerical simulation method to calculate the distribution of temperature field and flow field during the solidification process of Al-60Si alloy under different pouring temperatures,centrifugal speeds,and other process conditions.The optimal process parameters were determined to be a centrifugal speed of 800 r/min,a pouring temperature of 1 200℃,and a pouring speed of 16.5 mm/s.In addition,high-performance fine-grained Al-60Si alloy cast rings were prepared.It is found that different sizes of primary silicon phases are distributed in the outer,middle,and inner layers of the cast rings,and most of the outer parts are block-like primary silicon phases.The middle and inner layers are thick lath-like primary silicon phases.By calculating the coefficient of thermal expansion,it is found that the overall coefficient of thermal expansion of Al-60Si after centrifugation is small,and the outer layer of the cast ring has the smallest coefficient of thermal expansion and better performance.
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