摘要
对Al-Cu-Ce合金的实验表明,在凝固过程中,二次枝晶发生粗化,生长速度、温度梯度和铈含量都影响枝晶间距和粗化。枝晶粗化过程是在相邻二次枝晶臂的中部首先交粗、相遇和粘连,然后,粘合、并从中部向二次枝晶的根部和顶部扩展。粘合的驱动力是枝晶总的固液界面积减小。文中给出了一个描述一般凝固过程中的枝晶粗化模型。
Abstract
Experiments in Al-Cu-Ce alloys showed that coarsening secondary den-drite arm takes place during solidificaion process. The growth velocity, temperature gradient and cerium content can affect dendrite spacing and coarsening dendrite. The process of coarsening is that adjacent arms first coarsen and join at their middle part, then the coarsening dendrite exden-ts from its middle part to the root and head. The driving force for coalescence is due to the reduction of total solid-liquid interface area of the arms in the system. The modle describing the coarsening of secondary dendrite during the normal solidification was, given.
出处
《铸造》
CAS
CSCD
北大核心
1990年第10期32-35,共4页
Foundry
