High cooling rate cells, dendrites, microstructural spacings and microhardness in a directionally solidified Al–Mg–Si alloy - Archive ouverte HAL
Article Dans Une Revue Journal of Alloys and Compounds Année : 2015

High cooling rate cells, dendrites, microstructural spacings and microhardness in a directionally solidified Al–Mg–Si alloy

Résumé

Transient unidirectional solidification experiments have been carried out with an Al–3 wt%Mg–1 wt%Si alloy under cooling rates (T_ ) in the range 0.2–45 K/s. A reverse cells > dendrites transition is shown to occur with the high-cooling rate cellular region associated with T_ > 2 K/s and the dendritic region with T. < 0.8 K/s. Experimental growth laws correlating the cellular and dendritic spacings with the cooling rate are proposed. It is shown that the microhardness is directly influenced by both morphologies of the Al-rich matrix and by the relative fractions of Mg2Si and Fe bearing intermetallics that vary differently with the cooling rate.

Domaines

Matériaux
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Dates et versions

hal-01726098 , version 1 (07-03-2018)

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Citer

Crystopher Brito, Guillaume Reinhart, Henri Nguyen-Thi, Nathalie Mangelinck-Noel, Noé Cheung, et al.. High cooling rate cells, dendrites, microstructural spacings and microhardness in a directionally solidified Al–Mg–Si alloy. Journal of Alloys and Compounds, 2015, 636, pp.145 - 149. ⟨10.1016/j.jallcom.2015.02.140⟩. ⟨hal-01726098⟩
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