60Sn40)100-xNbx (x=0，0.4，0.6，0.8，at%)單相合金的深過冷凝固實(shí)驗(yàn)，研究了Co3Sn2相生長形貌的演變機(jī)制。結(jié)果表明，在小過冷度下，Co3Sn2相在x=0，0.4以海藻狀的模式進(jìn)行生長，隨著添加的Nb含量增加至0.6at%，其生長形貌轉(zhuǎn)變?yōu)闃渲?，并在x=0.8進(jìn)一步轉(zhuǎn)變?yōu)榉中魏Ｔ寰?，這主要是由于界面能各向異性和動(dòng)力學(xué)各向異性的變化。隨著過冷度的增加，(Co60Sn40)99.4Nb0.6合金中Co3Sn2相生長形貌在過冷度大于28 K時(shí)從樹枝晶轉(zhuǎn)變?yōu)榉中魏Ｔ?，?dāng)過冷度高于143 K時(shí)轉(zhuǎn)變?yōu)槊芗Ｔ?。少量的Nb添加在小過冷度和中間過冷度時(shí)能提高Co3Sn2相的生長速度，但是在大過冷度下會顯著降低生長速度。Co3Sn2相生長速度隨過冷度變化規(guī)律的轉(zhuǎn)變對應(yīng)其生長形貌從分形海藻向密集海藻的轉(zhuǎn)變。;The undercooled solidification of (Co60Sn40)100-xNbx(x=0, 0.4, 0.6, 0.8, at%) single phase alloys was performed to investigate the changes of Co3Sn2 phase growth morphology.Results show that the Co3Sn2 phase grows with fractal seaweed morphology at small undercooling (x=0, 0.4), and transits to dendrite as the content of added Nb increases to 0.6at%, and then returns to fractal seaweed (x=0.8) as a response to the changes in interfacial energy anisotropy and kinetic anisotropy. With the increase in undercooling, the growth morphology of Co3Sn2 phase in (Co60Sn40)99.4Nb0.6 alloys returns from dendrite back to factual seaweed at undercooling larger than 28 K and then transits to compact seaweed at undercooling more than 143 K. The minor Nb addition slightly increases the growth velocity of Co3Sn2 phase at low and intermediate undercooling but obviously decreases the growth velocity at large undercooling. The sharp increase in the growth velocity is corresponding to the transition of Co3Sn2 phase growth morphology from fractal seaweed to compact seaweed."/>