物理学报2011，Vol.60Issue(3)：465-473,9.
三元Co-Cu-Pb偏晶合金的快速凝固组织形成规律研究
Microstructure formation mechanism of rapidly solidified ternary Co-Cu-Pb monotectic alloys
摘要
Abstract
The metastable phase separation and rapid solidification of ternary Co-Cu-Pb monotectic alloys have been investigated under free fall condition. With the decrease of droplet diameter, the microstructures of Co51Cu47Pb2and Co47Cu44Pb9alloys display a “dendrite→core-shell→dendrite” transformation and a morphology transition from core-shell to homogeneous microstructure, respectively. X-ray diffraction analysis indicates that the solidified microstructures are composed of α(Co), (Cu) and (Pb) phases, α (Co) and (Cu) phases grow mainly in dendritic manner, and (Pb) phase is distributed interdendritically among (Cu) phase. Both experimental results and theoretical calculations reveal that the interfacial energy between (Co)/(Pb) liquid phases is larger than thoses of (Co)/(Cu) and (Cu)/(Pb) phases. The weak wetting ability between (Co) and (Pb) liquids results in the distribution of (Pb) phase inside the Cu-rich zone instead of Co-rich zone. Three possible solidification routes are deduced according to the solidification microstructure, in which the solidification process consists of phase separation L→L1 (Cu) + L2 (Co) , peritectic transformation α(Co) + L → ( Cu ) and monotectic transformation L (Cu) →S (Cu) + L (Pb).关键词
液相分离/偏晶合金/快速凝固/自由落体Key words
phase separation/ monotectic alloy/ rapid solidification/ free fall引用本文复制引用
闫娜,王伟丽,代富平,魏炳波..三元Co-Cu-Pb偏晶合金的快速凝固组织形成规律研究[J].物理学报,2011,60(3):465-473,9.基金项目
国家自然科学基金(批准号:50971105),陕西省自然科学基金研究计划(批准号:2009JQ6002)和西北工业大学基础研究基金(批准号:JC201050和G9KY1021)资助的课题. （批准号:50971105）
