Effect of Ultrasonic Waves on Microstructures and Properties of Solidified Al-12% Si Alloy: An Experimental Study

the microstructure of Al-12%Sii alloy subjected to different power ultrasound during solidification was studied.The microstructure of (Al) and Al+Si eutectic phase was observed.The experimental results showed that compared with the non-ultrasonic treatment, the number of solidified tissues and the size of pores were significantly reduced after the addition of ultrasonic field in each solidification stage.After increasing the ultrasonic effect, the porosity of Al-12%Si alloy in each stage can be reduced during solidification, and the most obvious ultrasonic effect is in the liquid phase.Under the action of ultrasound, the aspect ratio of Si phase decreased significantly.After the nucleation and grain growth of primary tissues were ultrasonic, the Si phase structure with the minimum aspect ratio was obtained.After adding ultrasonic treatment, α (Al) phase and eutectic structure with higher hardness were formed in al-12% Si alloy.Compared with α (Al), the maximum hardness was obtained by ultrasonic treatment of the alloy liquid phase, and the microstructure was increased by 20.3%.After ultrasonic treatment, rough deformation of piers occurred in al-12% Si alloy during compression, which showed obvious plastic deformation characteristics, and its yield strength was greatly improved.