The liquid phase separation of Bi-Ga hypermonotectic alloy under acoustic levitation condition  

作　　者：HONG ZhenYu LV YongJun XIE WenJun WEI BingBo 

机构地区：[1]Department of Applied Physics, Northwestem Polytechnical University, Xi'an 710072, China

出　　处：《Chinese Science Bulletin》2007年第11期1446-1450,共5页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 50121101, 50271058, 50395105 and 50301012)

摘　　要：Containerless treatment of Bi-58.5at%Ga hypermonotectic alloy is successfully performed with acous-tic levitation technique. Under acoustic levitation condition,the second phase (Ga) distributes almost homogeneously in solidification sample,opposite to macrosegregation in solidification sample under conventional condition. Stokes motion of the second liquid droplet (Ga) is significantly restrained un-der acoustic levitation condition. The analyses indicate that the melt vibration in the gravity direction forced by acoustic field can induce steady flow around the second liquid droplet,which influences droplet shape during its moving upward and consequently restrains Stokes motion velocity of the second liquid droplet.Containerless treatment of Bi-58.5at%Ga hypermonotecUc alloy is successfully performed with acoustic levitation technique. Under acoustic levitation condition, the second phase （Ga） distributes almost homogeneously in solidification sample, opposite to macrosegregation in solidification sample under conventional condition. Stokes motion of the second liquid droplet （Ga） is significantly restrained under acoustic levitation condition. The analyses indicate that the melt vibration in the gravity direction forced by acoustic field can induce steady flow around the second liquid droplet, which influences droplet shape during its moving upward and consequently restrains Stokes motion velocity of the second liquid droplet.

关 键 词：声悬浮 高导磁率合金 液相分离 斯托克司运动 光谱运动 

分 类 号：TG13[一般工业技术—材料科学与工程]