Solutal Convection of Liquid Al-3.5wt%Li during Its Upward Solidification
Si-Cheng Zhao1,2**, Qiu-Sheng Liu3, Henri Nguyen-Thi4, Bernard Billia4
1Department of Mechanics, School of Civil Engineering, Beijing Jiaotong University, Beijing 100044 2Jiangsu Key Laboratory of Engineering Mechanics, Southeast University, Nanjing 210096 3Key Laboratory of Microgravity, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080 4IM2NP, UMR CNRS 6137, Université d'Aix-Marseille, 13397 Marseille Cedex 20, France
Abstract：The onset of solutal convection during the directional solidification of Bridgman type of liquid Al-3.5 wt%Li is studied. Based on the analysis of a liquid-inhomogeneous-porous-double-layer system, a bimodal feature of neutral stability curve is found. The pulling rate is ascertained as the governing parameter for the mode transition, i.e., it determines whether the microstructure in the mushy layer is related to convection after the system destabilizes.
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2016, Vol. 33 
