Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions

doi:10.1088/1009-1963/15/4/036

中国物理B ›› 2006, Vol. 15 ›› Issue (4): 872-877.doi: 10.1088/1009-1963/15/4/036

• 8000 CROSSDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY • 上一篇下一篇

Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions

曹崇德

Department of Applied Physics, Northwestern Polytechnical University,Xi'an 710072, China

收稿日期:2005-11-08 修回日期:2005-12-19 出版日期:2006-04-20 发布日期:2006-04-20

Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions

Cao Chong-De (曹崇德)

Department of Applied Physics, Northwestern Polytechnical University,Xi'an 710072, China

Received:2005-11-08 Revised:2005-12-19 Online:2006-04-20 Published:2006-04-20

摘要/Abstract

摘要： The metastable liquid phase separation and rapid solidification behaviours of Co_61.8Cu_38.2 alloy were investigated by using differential thermal analysis (DTA) in combination with glass fluxing, electromagnetic levitation (EML) and drop tube techniques. It is found that the liquid phase separation process and the solidification microstructures intensively depend on the experimental processing parameters, such as undercooling level, cooling rate, gravity level, liquid surface tension and the wetting state of crucible. Large undercooling and surface tension difference of the two liquids tend to facilitate further separation and cause severe macrosegregation. On the other hand, rapid cooling and low gravity effectively suppress the coalescence of the minority phase. Severe macrosegregation patterns are formed in the bulk samples processed by both DTA and EML. In contrast, disperse structures with fine spherical Cu-rich spheres homogeneously distributed in the matrix of Co-rich phase have been obtained in drop tube.

Abstract: The metastable liquid phase separation and rapid solidification behaviours of Co_61.8Cu_38.2 alloy were investigated by using differential thermal analysis (DTA) in combination with glass fluxing, electromagnetic levitation (EML) and drop tube techniques. It is found that the liquid phase separation process and the solidification microstructures intensively depend on the experimental processing parameters, such as undercooling level, cooling rate, gravity level, liquid surface tension and the wetting state of crucible. Large undercooling and surface tension difference of the two liquids tend to facilitate further separation and cause severe macrosegregation. On the other hand, rapid cooling and low gravity effectively suppress the coalescence of the minority phase. Severe macrosegregation patterns are formed in the bulk samples processed by both DTA and EML. In contrast, disperse structures with fine spherical Cu-rich spheres homogeneously distributed in the matrix of Co-rich phase have been obtained in drop tube.

Key words: crystal growth, metastable phase separation, undercooling, rapid solidification

中图分类号: (Phase equilibria)

64.75.-g

64.60.My (Metastable phases) 81.30.Bx (Phase diagrams of metals, alloys, and oxides) 81.30.Fb (Solidification)

曹崇德. Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions[J]. 中国物理B, 2006, 15(4): 872-877.

Cao Chong-De (曹崇德). Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions[J]. Chinese Physics, 2006, 15(4): 872-877.

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Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions

Metastable phase separation and rapid solidification of undercooled Co-Cu alloy under different conditions

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