The role of AlTi5B1 grain refinement and the cooling rate on the formation behaviour of Fe-rich compounds in secondary AlSi8Cu3 alloys have been studied. Metallographic and thermal analysis techniques have been used to characterize the precipitation behaviour of Fe-bearing precipitates. The results indicate how the Al- Ti-B grain refinement can influence the precipitation sequence of Fe-bearing phases by promoting the crystallization of β-Al5FeSi over α-Al15(FeMn)3Si2 in the microstructure. The formation of β-Al5FeSi intermetallics occurs nucleating from TiB2 particles, the efficiency of which seems to be further affected by the cooling rate.
The influence of AlTi5B1 grain refinement and the cooling rate on the formation behaviour of Fe-rich compounds in secondary AlSi8Cu3 alloys
RAKHMONOV, JOVID;TIMELLI, GIULIO;BONOLLO, FRANCO
2016
Abstract
The role of AlTi5B1 grain refinement and the cooling rate on the formation behaviour of Fe-rich compounds in secondary AlSi8Cu3 alloys have been studied. Metallographic and thermal analysis techniques have been used to characterize the precipitation behaviour of Fe-bearing precipitates. The results indicate how the Al- Ti-B grain refinement can influence the precipitation sequence of Fe-bearing phases by promoting the crystallization of β-Al5FeSi over α-Al15(FeMn)3Si2 in the microstructure. The formation of β-Al5FeSi intermetallics occurs nucleating from TiB2 particles, the efficiency of which seems to be further affected by the cooling rate.
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