(1 Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming, Shanghai Jiao Tong University, Shanghai 200240, China) (2 Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Shanghai 215600, China)
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DOI:
10.7502/j.issn.1674-3962.2016.09.08
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Abstract:
It has important scientific value and practical significance to investigate nucleation and growth process of equiaxed dendrites. In addition to theoretical study by mathematical model, direct observations are very necessary. For a long time, the solidification process of metals has been a "black box" due to the high temperature melt that is opaque to visible light. The development of X-ray synchrotron radiation imaging technology has made it possible to carry out dynamic and continuous observations of metal solidification. As a high brightness, high energy X-ray source, synchrotron radiation X-ray can penetrate aluminum melt with a thickness of several millimeters and obtain clear images. In recent years, our research group carried out continuous research in the field of alloy solidification morphology evolution in Shanghai synchrotron radiation facility (SSRF). Some research results were reported in this paper, involving dynamic observations of the formation and growth of the equiaxed dendrites. A special attention was made to the effect of alloy refiners on growth morphology and micro-segregation of equiaxed dendrites.