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中文摘要：
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。
英文摘要：
A third-generation synchrotron radiation imaging technique combined with a high-resolution fast-readout CCD （Charge Coupled Device） system was applied to study the dendrite growth of metallic alloy with high resolution images. As one of the first group users of Shanghai Synchrotron Radiation Facility （SSRF）, we acquired a series of animated images of dendrite growth at different cooling rates, using the in-line holography imaging method. At an increased cooling rate, the dendrite grew in an equiaxed manner, the nucleation rate became higher, and the secondary DAS （dendrite arm spacing） reduced greatly. In addition, the formation of microsegregation was affected greatly by the cooling rate.
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