Abstract
Dendrite coarsening in Sn-13 wt pct Bi alloy was observed in real time with high resolution synchrotron microradiography during continuous cooling and isothermal holding. Coarsening mechanisms such as dendrite remelting from tips toward roots and coalescence between neighboring branches were observed. Dendrite remelting was found to be dominant in the early stage of dendrite growth, whereas coalescence was dominant during isothermal coarsening. Rates of dendrite remelting and coalescence during continuous cooling and isothermal holding were measured from the captured images. The evolution of secondary dendrite arm spacing (DAS) was also measured from the real time observations. These results provided better understanding of dendrite coarsening during alloy solidification.
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