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对不同温度的Al-12Si-4Cu-Mg-2Ni活塞合金熔体进行了超声处理,研究了超声处理温度和超声功率对合金显微组织和力学性能的影响。结果表明,超声处理细化了初生Si、共晶Si,提升了合金力学性能。熔体温度为720℃时的细化效果优于650℃和690℃。熔体温度为720℃,超声功率为0~1400W时,初生Si的平均等积圆直径从40.73μm减小到23.35μm;共晶Si的平均长度从39.6μm减小到27.1μm;第二相的形态未发生改变;与未超声处理相比,合金的室温抗拉强度和350℃高温抗拉强度分别提高了21.9%和22.8%。
The melt of Al-12Si-4Cu-Mg-2Ni piston alloy with different temperature was sonicated and the effect of ultrasonic treatment temperature and ultrasonic power on the microstructure and mechanical properties of the alloy was studied. The results show that the ultrasonic treatment refined Si, eutectic Si, improved mechanical properties of the alloy. The refining effect at melt temperature of 720 ℃ is better than 650 ℃ and 690 ℃. When the melt temperature is 720 ℃ and the ultrasonic power is 0 ~ 1400W, the average circle-equivalent diameter of primary Si decreases from 40.73μm to 23.35μm; the average length of eutectic Si decreases from 39.6μm to 27.1μm; the second phase The tensile strength at room temperature and the high temperature tensile strength at 350 ℃ increased by 21.9% and 22.8%, respectively, compared with those without ultrasonic treatment.