(南昌航空大學 航空制造工程學院，南昌 330063)
摘 要: 通過測試與分析不同超聲功率與凝固壓力下真空差壓鑄造ZL114A鋁合金的二次枝晶間距，研究超聲功率與凝固壓力協(xié)同作用對真空差壓鑄造鋁合金二次枝晶間距的影響，建立真空差壓鑄造ZL114A鋁合金二次枝晶間距與超聲功率及凝固壓力的關(guān)系。結(jié)果表明：在超聲功率和凝固壓力協(xié)同作用下，超聲效應(yīng)與凝固壓力擠滲效應(yīng)共同影響真空差壓鑄造鋁合金二次枝晶間距；在超聲功率600 W與凝固壓力350 kPa協(xié)同作用下，真空差壓鑄造鋁合金二次枝晶間距最小；當凝固壓力小于300 kPa時，超聲功率對鋁合金二次枝晶間距影響較大；當凝固壓力大于300 kPa時，凝固壓力對真空差壓鑄造ZL114A鋁合金二次枝晶間距影響較大。
關(guān)鍵字: 鋁合金；二次枝晶間距；超聲功率；凝固壓力；真空差壓鑄造
（School of Aeronautic Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The effect of synergistic action between ultrasonic power and solidification pressure on the secondary dendrite arm spacing of vacuum counter-pressure casting ZL114A aluminum alloy was studied through testing and analyzing the secondary dendrite arm spacing subjected to different ultrasonic power and solidification pressure. Meanwhile, the relationship of the secondary dendrite arm spacing of vacuum counter-pressure casting ZL114A aluminum alloy with ultrasonic power and solidification pressure was established. The results indicate that ultrasonic effect and extrusion and infiltration effect of solidification pressure affect the secondary dendrite arm spacing of vacuum counter-pressure casting aluminum alloy under synergistic action between ultrasonic power and solidification pressure, and the secondary dendrite arm spacing of aluminum alloy is the smallest under synergistic action of 600 W ultrasonic power and 350 kPa solidification pressure. When the solidification pressure is less than 300 kPa, the effect of ultrasonic power on secondary dendrite arm spacing is obvious, but when the solidification pressure is more than 300 kPa, the effect of solidification pressure on secondary dendrite arm spacing is greater.
Key words: aluminum alloy; secondary dendrite arm spacing; ultrasonic power; solidification pressure; vacuum counter-pressure casting
