Morphological evolution of non-dendritic microstructure during solidification under stirring
Morphological evolution of non-dendritic microstructure during the solidification of succinonitrile-5％water (SCN-5％Wat) transparent alloy under mechanical stirring was experimentally investigated. The incubation time for the formation of non-dendritic microstruetures decreased rapidly and the mierostructure was gradually refined with the increase of stirring rate and cooling rate. When the stirring rate and cooling rate were low, the incubation time for the formation of non-dendritic microstructures decreased obviously with the increase of the melt undercooling. When the stirring rate was high, the effect of the melt undereooling on the incubation time for the formation of non-dendritic microstructures was weak. The morphology of primary microstruetures had an important influence on the subsequent morphological evolution of these microstructures during the isothermal holding of the melt without stirring. It was found that when there were dendrites in the undercooled melt, the dendrites would be dissolved and the final mierostructure would be replaced by the re-nucleated globular crystals if the stirring time was long enough.
non-dendritic globular crystal morphological evolution stirring cooling rate
LIN Xin TONG Lei-lei ZHAO Li-ning WANG Li-lin WANG Meng HUANG Wei-dong
State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian 7100 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xian 710
国际会议
北京
英文
826-831
2010-09-16（万方平台首次上网日期，不代表论文的发表时间）