Agradecimentos: The authors acknowledge the financial support provided by FAPESP-São Paulo Research Foundation, Brazil (Grants 2012/08494-0, 2013/23396-7 and 2014/25809-0), CNPq (The Brazilian Research Council) and CAPES-COFECUB (Grant 857/15)

Transient unidirectional solidification experiments have been carried out with an Al–3 wt%Mg–1 wt%Si alloy under cooling rates () 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 > 2 K/s and the dendritic...

Transient unidirectional solidification experiments have been carried out with an Al–3 wt%Mg–1 wt%Si alloy under cooling rates () 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 > 2 K/s and the dendritic region with < 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

FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP

2012/08494-0; 2013/23396-7; 2014/25809-0

COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ

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