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第三代同步辐射光源配合高读写速度及高分辨率的CCD(Charge Coupled Device)成像系统对合金凝固过程枝晶组织演变进行实时成像。作为首批上海光源试用光用户,采用类同轴成像法得到一系列不同冷却速率下的枝晶组织生长动态图像。随冷却速率的加大,合金的枝晶组织趋向等轴晶形貌生长,形核率增加,枝晶的二次枝晶臂间距明显减小。不同的冷却速率对合金微观组织中的显微偏析也有显著影响。
The third generation of synchrotron radiation light source realizes real-time imaging of the dendritic structure evolution during solidification of the alloy with high read-write speed and high-resolution CCD (Charge Coupled Device) imaging system. As the first batch of Shanghai light source light users, using coaxial imaging method to obtain a series of different cooling rate of dendritic tissue growth dynamic images. With the increase of cooling rate, the dendrite structure of the alloy tends to grow in the equiaxed morphology and the nucleation rate increases, and the dendrite secondary dendrite arm spacing decreases obviously. Different cooling rates also have a significant effect on the microsegregation in the alloy microstructure.