Abstract
In order to study the cellular/dendritic spacing selection under ultra-high temperature gradient and rapid solidification condition, laser surface remelting technology have been adopted for its special advantages. During laser surface remelting, there is an extremely high temperature gradient (>10{sup 6}k/m) in the laser molten pool, which leads to directional growth of various microstructures. Two main advantages of the experiment are (1) no nucleation is involved, i.e., epitaxial growth; (2) the local growth rate and the corresponding microstructure can be determined directly. In the present work, detailed experiments have been carried out to investigate the cellular/dendrite spacing selection of Cu-Mn alloy under ultra-high temperature gradient and rapid unidirectional solidification condition, and the experiment results are compared with KGT model.
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