Abstract
The growth behavior and morphological evolution of dendrites in solidifying Sn–Bi alloy under electric currents [e.g., direct current (DC) and electric current pulse (ECP)] are in situ studied using synchrotron radiation X-ray imaging technique. The suppression of dendrite growth, floating and rotation of dendrites, refinement and remelting of dendrites are investigated by analyzing a series of animated images captured during the experiments. The modification mechanisms of dendrite morphology by electric fields are discussed based on the in situ and real-time observations. When DC is imposed on the samples, the growth of dendrites is significantly suppressed due to the effect of Joule heat, and a small dendrite freely flows up and rotates due to the common effect of natural convection. When ECP is imposed in the whole solidification process, the outset of solidification is delayed by Joule heat. And due to the accumulation of undercooling, dendrites suddenly nucleate, grow and finally become fine primary dendrite arm spacing. When ECP is imposed during the crystal growth stage only, the dendrites are remelted at first and then reappear along the original growing trajectories, showing the hereditary feature.
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Acknowledgments
The authors gratefully acknowledge the supports of National Natural Science Foundation of China (Nos. 51274054, U1332115, 51271042, 51375070), the Keygrant Project of Chinese Ministry of Education (No. 313011). The authors wish to thank all the staff members of the BL13W1 beamline of SSRF and 4W1A beamline of Beijing Synchrotron Radiation Facility (BSRF).
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Wang, T., Zhu, J., Kang, H. et al. In situ synchrotron X-ray imaging on morphological evolution of dendrites in Sn–Bi hypoeutectic alloy under electric currents. Appl. Phys. A 117, 1059–1066 (2014). https://doi.org/10.1007/s00339-014-8537-6
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DOI: https://doi.org/10.1007/s00339-014-8537-6