Real-time dendrite growth of Sn-Pb binary alloy was observed with diffraction-enhanced imaging method at Beijing Synchrotron Radiation Facility(BSRF)

and a series of time-sequenced images of the growth behavior and morphology evolution of dendrites were successfully obtained.These can offer the direct proofs to verify or improve the solidification theories of metallic alloy.The Sn-50wt%Pb alloy(near eutectic composition) grew in a manner with equiaxed first and then columnar dendritic morphology.This work provides a new approach for the study of alloy solidification and enables people have better understanding of alloy solidification processes.It is feasible to validate or complete the crystallization dynamics of metallic alloy by diffraction-enhanced imaging method.