Effects of Al-P Modification on Hypereutectic Microstructure and Mechanical Properties of Al-Si Alloy
The effect of phosphorus modification treatment on microstructure of hypereutectic Al-Si alloy was introduced.Firstly,primary crystal silicon was refined by adopting phosphorus modification agent with different contents.Then,eutectic silicon was refined by the heat treatment,and the optimum amount of phosphorus modification agent was obtained.The microstructure and mechanical properties of the alloy after the refinement were presented.The results show that,complete granulation of eutectic silicon can be gotten by the process.The primary silicon grains are smaller,and the average grain size is about 15 μm.The tensile strength of the material can reach 358.367MPa after T6 treatment.