(南昌航空大學(xué) 航空制造工程學(xué)院，南昌 330063)
摘 要: 通過測試與分析不同結(jié)晶壓力下真空差壓鑄造ZL114A鋁合金的二次枝晶間距，研究結(jié)晶壓力對真空差壓鑄造鋁合金二次枝晶間距的影響；并建立真空差壓鑄造ZL114A鋁合金二次枝晶間距與結(jié)晶壓力和壁厚的關(guān)系。結(jié)果表明，結(jié)晶壓力對真空差壓鑄造鋁合金二次枝晶間距影響顯著，對于相同壁厚的試樣，隨著結(jié)晶壓力的增大，鋁合金二次枝晶間距減小；在同一結(jié)晶壓力下，隨著壁厚的減小，鋁合金二次枝晶間距減小；結(jié)晶壓力小于350 kPa時，壁厚對二次枝晶間距影響較大；結(jié)晶壓力大于350 kPa時，結(jié)晶壓力對二次枝晶間距影響較大。
關(guān)鍵字: 鋁合金；真空差壓鑄造；結(jié)晶壓力；二次枝晶間距；壁厚
（School of Aeronautic Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China）
Abstract:The effect of crystallization 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 (SDAS) subjected to different crystallization pressures. Meanwhile, the relationships among the secondary dendrite arm spacing of vacuum counter-pressure casting ZL114A aluminum alloy and crystallization pressure and wall thickness were established. The results indicate that the effect of crystallization pressure on the secondary dendrite arm spacing of vacuum counter-pressure casting aluminum alloy is obvious. For the samples with the same wall thickness, the secondary dendrite arm spacing of aluminum alloy decreases with the increase of crystallization pressure. Under the same crystallization pressure, the secondary dendrite arm spacing of aluminum alloy decreases with the decrease of wall thickness. When the crystallization pressure is less than 350 kPa, the effect of wall thickness on the secondary dendrite arm spacing is obvious, while when the crystallization pressure is more than 350 kPa, the effect of crystallization pressure on secondary dendrite arm spacing is obvious.
Key words: aluminum alloy; vacuum counter-pressure casting; crystallization pressure; secondary dendrite arm spacing; wall thickness
