挤压铸造2A50合金不同固溶处理状态的显微组织和偏析缺陷  

Microstructure and segregation of squeeze cast 2A50 aluminum alloy after different solution treatment

作　　者：侯立群[1] 乔小蒙 李素梅[1] 范云波[1] 邢志媛[1] 

机构地区：[1]中国兵器科学研究院宁波分院,浙江宁波315103 [2]装甲兵驻上海地区军事代表室,上海200011

出　　处：《兵器材料科学与工程》2014年第6期46-50,共5页Ordnance Material Science and Engineering

摘　　要：对用挤压铸造工艺和2A50合金生产的铝合金轮毂,借助差热分析仪、金相显微镜和扫描电镜等手段,研究挤压铸造2A50合金不同热处理状态下的显微组织和偏析缺陷。结果表明:挤压铸造2A50合金的组织特征为铸造组织;T6处理后的组成相为Mg2Si相、ω(Cu4Mg5Si4)相和θ(Al2Cu)相,合金的过烧温度为530℃,偏析缺陷的过烧温度为525℃;降低浇注温度或模具温度,添加微量元素Ti、B,可减缓或消除"挤压铸造异常偏析"。With the aids of differential scanning calorimetry（DSC）,Optical Microscope（OP） and Scanning Electronic Microscope（SEM）,the microstructure and segregation defects of 2A50 aluminum alloy wheel- hub by squeeze casting after different heat treatment were analyzed. The results show that the characteristic of 2A50 alloy is as- cast microstructure. The composition phases of 2A50 alloy after T6 treatment consist of Mg2 Si,ω（Cu4Mg5Si4）and θ（Al2Cu）. The over-burnt temperature is530 ℃,the over-burnt temperature of segregation region is 525 ℃. The abnormal segregation microstructure can be alleviated by decreasing casting temperature or mold temperature,adding trace elements Ti,B etc.

关 键 词：2A50合金 挤压铸造 热处理 差热分析 显微组织 偏析 

分 类 号：TG249[金属学及工艺—铸造]