%0 Journal Article %T Peritectic solidification under high undercooling conditions %A Chongde Cao %A Xiaoyu Lu %A Bingbo Wei %J Chinese Science Bulletin %@ 1861-9541 %D 1999 %I %R 10.1007/BF02885858 %X The solidification characteristics of highly undercooled Cu-7.77% Co peritectic alloy has been examined by glass fluxing technique. The obtained undercoolings vary from 93 to 203 K(0.14 TL). It is found that the ¦Á(Co) phase always nucleates and grows preferentially, which is followed by peritectic transformation. This means that the peritectic phase cannot form directly, even though the alloy melt is undercooled to a temperature far below its peritectic point. The maximum recalescence temperature measured experimentally decreases as undercooling increases, which is lower than the thermodynamic calculation result owing to the actual non-adia-batic nature of recalescence process. The dendritic fragmentation of primary ¦Á (Co) phase induced by high undercooling is found to enhance the completion of peritectic transformation. In addition, the LKT/BCT dendrite growth model is modified in order to make it appllcable to those binary alloy systems with seriously curved liquidus and solidus lines. The dendrite growth velocities of primary ¦Á (Co) phase are subsequently calculated as a function of undercooling on the basis of this model. %K peritectlc solidfication %K undercooling %K nucleation %K recalescence %K dendrite growth %U http://link.springer.com/article/10.1007/BF02885858