Solute redistribution profiles during rapid solidification of undercooled ternary Co-Cu-Pb alloy  

作　　者：YAN Na WANG WeiLi XIA ZhenChao WEI BingBo 

机构地区：[1]Key Laboratory of Applied Physics and Chemistry,Ministry of Education,Northwestern Polytechnical University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2014年第3期393-399,共7页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 51327901,50971105 and 51301138);the Specialized Research Fund for the Doctoral Program of Higher Education (Grant No. 20126102120064);the Fundamental Research Fund of Northwestern Polytechnical University (Grant No. JC20110278)

摘　　要：The solute redistribution and phase separation of liquid ternary Co-35%Cu-32.5%Pb immiscible alloy have been investigated using glass fluxing method.A bulk undercooling of 125 K was achieved and the macrosegregation pattern was characterized by a top Co-rich zone and a bottom Cu-rich zone.The average solute contents of the two separated zones decreased with the increase of undercooling,except for the solute Pb in Cu-rich zone.With the enhancement of undercooling,a morphological transition from dendrites into equaxied grains occurred to the primary(Co)phase in Co-rich zone.The solute redistribution of Cu in primary(Co)phase was found to depend upon both the undercooling and composition of Co-rich zone.Stokes migration is shown to be the main dynamic mechanism of droplet movement during liquid phase separation.The solute redistribution and phase separation of liquid ternary Co-35%Cu-32.5%Pb immiscible alloy have been investigated using glass fluxing method. A bulk undercooling of 125 K was achieved and the macrosegregation pattern was characterized by a top Co-rich zone and a bottom Cu-rich zone. The average solute contents of the two separated zones decreased with the increase of undercooling, except for the solute Pb in Cu-rich zone. With the enhancement of undercooling, a morphological transition from dendrites into equaxied grains occurred to the primary α（Co） phase in Co-rich zone. The solute redistribution of Cu in primary α（Co） phase was found to depend upon both the undercooling and composition of Co-rich zone. Stokes mi- gration is shown to be the main dynamic mechanism of droplet movement during liquid phase separation.

关 键 词：solute redistribution phase separation MACROSEGREGATION UNDERCOOLING rapid solidification 

分 类 号：TG111.4[金属学及工艺—物理冶金]