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|Type:||Artigo de periódico|
|Title:||High Cooling Rate Cells, Dendrites, Microstructural Spacings And Microhardness In A Directionally Solidified Al-mg-si Alloy|
|Abstract:||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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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