Macrosegregation in squeeze-cast Al5Cu0.4Mn alloy based on Taguchi method

作者：Gan, Yao-Qiang; Zhang, Da-Tong^*; Zhang, Wei-Wen; Zhang, Wen; Li, Yuan-Yuan

来源：Chinese Journal of Nonferrous Metals, 2012, 22(12): 3386-3394.

• Al-Cu alloys
• Applied pressure
• Backflow
• Cast ingots
• Casting parameters
• Delay Time
• Die temperatures
• Die wall
• Gravity casting
• Interdendritic channels
• Macrosegregations
• Optimized conditions
• Pouring temperatures
• Shrinkage porosity
• Solute concentrations

Taguchi method was used to investigate the effects of applied pressure(p), pouring temperature(Tp), die temperature(Td) and delay time(td) on the macrosegregation of Cu in the squeeze casting of Al5Cu0.4Mn alloy. And the level of macrosegregation in cast ingot under optimized conditions was predicted successfully. The results show that the influence sequence of squeeze casting parameters on macrosegregation from large to small is Tp, Td, p, td. The pouring temperature of 680°C, die temperature of 200°C and applied pressure of 75 MPa were proposed for obtaining the sound squeeze castings. Through analysis of composition and microstructure by SEM and OM, it is revealed that the squeeze casting leads to the normal segregation of Cu rather than inverse solute concentration profiles under gravity casting conditions. It is the action of applied pressure that resulted the filling of shrinkage porosity with backflow of solute-rich liquid along the interdendritic channels. And fish-bone-like segregation strips form, which are parallel to the die wall. The amount of segregation strips decreases from edge to center in the cast ingot.

• 出版日期2012-12
• 单位华南理工大学