Comparative study of the influence of natural convection on directional solidification of Al–3.5 wt% Ni and Al–7 wt% Si alloys |
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| Authors: | B.H. Zhou, H. Jung, N. Mangelinck-Noë l, H. Nguyen-Thi, B. Billia, Q.S. Liu,C.W. Lan |
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| Affiliation: | aL2MP, UMR 6137, Université Paul Cézanne (Aix-Marseille III), Marseille, France;bInstitute of Mechanics, NML/CAS, Chinese Academy of Sciences, Beijing, China;cDepartment of Chemical Engineering, National Taiwan University, Taipei, China |
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| Abstract: | We present numerical simulations of thermosolutal convection for directional solidification of Al–3.5 wt% Ni and Al–7 wt% Si. Numerical results predict that fragmentation of dendrite arms resulting from dissolution could be favored in Al–7 wt% Si, but not in Al–3.5 wt% Ni. Corresponding experiments are in qualitative agreement with the numerical predictions. Distinguishing the two fragmentation mechanisms, namely dissolution and remelting, is critical during experiments on earth, when fluid flow is dominant. |
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| Keywords: | Solidification Mushy zone Natural convection Dendrite fragmentation |
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