Surface tension of molten Al-Si alloy at temperatures ranging from 923 to 1123 K |
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Authors: | Lei Dou ZhangFu Yuan JianQiang Li Jing Li XiaoQiang Wang |
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Institution: | (1) Department of Energy and Resources Engineering, College of Engineering, Peking University, Beijing, 100871, China;(2) State Key Laboratory of Multi-phase Complex System, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100080, China;(3) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China |
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Abstract: | The surface tension of molten AlSi20 alloy has been measured by using the sessile drop method at 923–1123 K under argon atmosphere
in both heating-up and cooling processes. The result shows that the surface tension of this alloy decreases as long as temperature
increases. The results of surface tension and contact angles in heating-up process have differences from those obtained in
cooling process, because the metal microstructures have some changes at different temperatures based on the metal genetic
theory. The surface tension of molten AlSi20 alloy and that of molten pure aluminum have been compared as well, and the temperature
coefficient of AlSi20 alloy is slightly lower than that of Al. The result has been analyzed by the linear scanning analysis
with ESEM. The concentration of silicon in most region of the bulk is lower than that of the surface and the addition of Si
to pure Al decreases the surface tension of molten pure Al.
Supported by the National Natural Science Foundation of China (Grant Nos. 50474043 and 50711140385) |
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Keywords: | surface tension Al-Si alloy sessile drop method |
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