(南昌航空大学 航空制造工程学院，南昌 330063)
摘 要: 通过测试与分析不同超声功率与凝固压力下真空差压铸造ZL114A铝合金的二次枝晶间距，研究超声功率与凝固压力协同作用对真空差压铸造铝合金二次枝晶间距的影响，建立真空差压铸造ZL114A铝合金二次枝晶间距与超声功率及凝固压力的关系。结果表明：在超声功率和凝固压力协同作用下，超声效应与凝固压力挤渗效应共同影响真空差压铸造铝合金二次枝晶间距；在超声功率600 W与凝固压力350 kPa协同作用下，真空差压铸造铝合金二次枝晶间距最小；当凝固压力小于300 kPa时，超声功率对铝合金二次枝晶间距影响较大；当凝固压力大于300 kPa时，凝固压力对真空差压铸造ZL114A铝合金二次枝晶间距影响较大。
关键字: 铝合金；二次枝晶间距；超声功率；凝固压力；真空差压铸造
（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
