Thermodynamic Design and Experiment on High Conductivity Die-casting Al-Si-Fe Aluminum Alloy for 5G Base Station Heat Sink
In view of the inversion problem between strength and electrical(thermal)conductivity of die-cast alumi-num heat sinks in 5G base stations,effects of aging treatment on microstructure and conductivity of die-cast Al-7.5Si-0.8Fe aluminum alloys were investigated through a combination of thermodynamic calculations and experimental research by PANDAT thermodynamic calculations,metallographic microscopy,scanning electron microscopy,X-ray diffraction,and transmission electron microscopy.The results indicate that the conductivity of alloy is significantly improved after heat aging treatment at 320℃ for 1 h.Al-Fe-Si ternary phases and Si phase are precipitated along the grain boundaries and interior,respectively,thus reducing the solid solubility of Fe and Si in Al matrix.In addition,the continuity of eutectic Si network is deteriorated after aging,accompanied with the increased connectivity of the alumi-num matrix,which is the main reason for the enhancement of conductivity.
NETL
NSTL
万方数据
