Effects of ultrasonic vibration and manganese on microstructure and mechanical properties of hypereutectic Al-Si alloys with 2%Fe

► The effect of combined use of ultrasonic vibration and P addition on the refinement of primary Si was investigated. ► The effects of ultrasonic vibration and manganese on the morphology of Fe-containing intermetallic compounds were studied. ► The mechanical properties at both room and elevated temperature were tested. ► The effect of heat treatment on the Fe-containing intermetallic compounds was performed.