Refining Effect of a New Al3Ti1B1RE Master Alloy on Al Sheets Used for Can Manufacture and Behavior of Rare Earths in Master Alloy
来源期刊：JOURNAL OF RARE EARTHS2003年第5期
论文作者：傅高升 陈文哲 钱匡武
Key words：matel materials; Al sheets used for can manufacture; grain refinement; Al3Ti1B1RE master alloy; refining mechanism; rare earths;
Abstract: The refining effect of Al3Ti1B1RE master alloy on Al sheets used for pressure can manufacture and the behavior of mixed rare earths (RE) in master alloy were investigated with XRD, OM, SEM and EDAX. It is found that the refining effect of the refiner on the material has superiority over foreign or domestic Al5Ti1B refiner, and the refiner still retains its refining ability for 6 h after adding it to molten Al, thus improving the strength and plasticity of the material remarkably. The excellent refining effect and stability of AlTiBRE refiner result from that RE can lower the surface energy of molten Al and improve the wetting characteristics of molten Al on refinement nuclei such as TiAl3, TiB2, etc., thus giving full play to the effect of heterogeneous nucleation and impeding the congregating tendency of TiB2 phase in molten Al. At the same time, RE gathering in front of solid/liquid interface are also easy to cause composition supercooling in molten Al, thus impeding the growth of α-Al grains and promoting α-Al nucleation on refinement nuclei. In addition, RE also play certain role in purification and grain refinement, or modification, especially their effect of purification can improve the metallurgical quality of AlTiBRE master alloy.
傅高升1，陈文哲2，钱匡武2
(1.Department of Mechanical Engineering, Fuzhou University, Fuzhou 350002, China;
2.College of Materials Science and Engineering, Fuzhou University, Fuzhou 350002, China)
Abstract:The refining effect of Al3Ti1B1RE master alloy on Al sheets used for pressure can manufacture and the behavior of mixed rare earths (RE) in master alloy were investigated with XRD, OM, SEM and EDAX. It is found that the refining effect of the refiner on the material has superiority over foreign or domestic Al5Ti1B refiner, and the refiner still retains its refining ability for 6 h after adding it to molten Al, thus improving the strength and plasticity of the material remarkably. The excellent refining effect and stability of AlTiBRE refiner result from that RE can lower the surface energy of molten Al and improve the wetting characteristics of molten Al on refinement nuclei such as TiAl3, TiB2, etc., thus giving full play to the effect of heterogeneous nucleation and impeding the congregating tendency of TiB2 phase in molten Al. At the same time, RE gathering in front of solid/liquid interface are also easy to cause composition supercooling in molten Al, thus impeding the growth of α-Al grains and promoting α-Al nucleation on refinement nuclei. In addition, RE also play certain role in purification and grain refinement, or modification, especially their effect of purification can improve the metallurgical quality of AlTiBRE master alloy.
Key words:matel materials; Al sheets used for can manufacture; grain refinement; Al3Ti1B1RE master alloy; refining mechanism; rare earths;
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