高含Pb量Cu-Pb过偏晶合金的快速凝固研究  

Investigation on the Rapid Solidification of CuPb Hypermonotectic Alloy with High Pb Content

作　　者：陈娓[1] 徐锦锋[1] 范于芳[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《铸造技术》2008年第11期1537-1540,共4页Foundry Technology

基　　金：陕西省自然科学基金资助项目(2006E134)

摘　　要：采用急冷快速凝固实验装置研究Cu-75%Pb和Cu-86%Pb过偏晶合金的快速凝固过程及其组织特征,探索冷却速率和固液相共存温度区间宽度与合金相分离之间的相关规律。在急冷快速凝固条件下,大的冷却速率使合金凝固时间大幅度缩短,过冷L2液相粘度增大,Stokes运动被消弱,液相分离在很大程度上受到抑制,实验条件下,宽的固液共存区间对合金的相分离并不产生显著影响。高含Pb量Cu-Pb过偏晶合金均可获得均匀弥散的微观组织。随着冷却速率的增大,凝固组织显著细化,均匀性明显提高。The rapid solidification and microstructural characteristics of Cu-75 wt% Pb and Cu- 86 wt%Pb hypermonotectic alloys were investigated by melt-spun method, and the relationship of the cooling rate, the mushy zone width and phase separation was analyzed. Under rapid solidification, the higher cooling rate can shorten the solidification time dramatically, increase the viscosity of undercooled L2 liquid phase and weaken the Stokes motion. Therefore, the liquid phase separation are largely suppressed during the process of rapid solidification. The wide mushy zone has no significant effect on the phase separation of alloys, which results in the formation of uniform microstructure for various Cu-Pb hypermonotectic alloys with higher Pb content. With increase of cooling rate, the solidified microstructure is refined remarkablyand the uniformity is improved obviously.

关 键 词：Cu—Pb过偏晶合金 快速凝固 相分离 组织形态 

分 类 号：TG244.3[金属学及工艺—铸造]