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Article Dans Une Revue Materials & Design Année : 2010

Microstructural development during transient directional solidification of hypermonotectic Al–Bi alloys

Résumé

Directional unsteady-state solidification experiments were performed with hypermonotectic Al–5.0 wt%Bi and 7.0 wt%Bi alloys. Thermal parameters such as the growth rate (v) and the thermal gradient (G) were experimentally determined by cooling curves recorded along the casting length. The predominant Bi-rich phase was characterized by droplets embedded in the aluminum matrix. Both the interphase spacing (k) and the Bi-rich particles diameter (d) were measured along the casting length. These microstructural features were correlated to the solidification thermal parameters: growth rate, cooling rate and thermal gradient. An experimental law expressing k as a function of both G and v was found to better represent the growth of hypermonotectic Al–Bi alloys. Moreover, it was found that the interphase spacing decreases with increasing alloy bismuth content.

Dates et versions

hal-01728621 , version 1 (11-03-2018)

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Adrina Silva, José Spinelli, Nathalie Mangelinck-Noel, Amauri Garcia. Microstructural development during transient directional solidification of hypermonotectic Al–Bi alloys. Materials & Design, 2010, 31 (10), pp.4584 - 4591. ⟨10.1016/j.matdes.2010.05.046⟩. ⟨hal-01728621⟩
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