The influence of cooling rate on the chemical composition and morphological structure of Fe-rich intermetallics in a secondary Al-Si-Cu alloy has been investigated by using several analysis techniques such as optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and backscattered electron diffraction. Morphological, chemical composition and size evolution of a-Al(Fe,Mn,Cr)Si have been observed and characterized under different solidification conditions. By varying the cooling rate, α-Al(Fe,Mn,Cr)Si blocky crystals, as well as chinesescript, branched structures and dendrites form, while coarse β-Al(Fe,Mn)Si needles appear at lower cooling rates.
Evolution of Fe-rich compounds in a secondary Al-Si-Cu alloy: Influence of cooling rate
FABRIZI, ALBERTO;TIMELLI, GIULIO;FERRARO, STEFANO;BONOLLO, FRANCO
2015
Abstract
The influence of cooling rate on the chemical composition and morphological structure of Fe-rich intermetallics in a secondary Al-Si-Cu alloy has been investigated by using several analysis techniques such as optical microscopy, scanning electron microscopy, energy dispersive spectroscopy and backscattered electron diffraction. Morphological, chemical composition and size evolution of a-Al(Fe,Mn,Cr)Si have been observed and characterized under different solidification conditions. By varying the cooling rate, α-Al(Fe,Mn,Cr)Si blocky crystals, as well as chinesescript, branched structures and dendrites form, while coarse β-Al(Fe,Mn)Si needles appear at lower cooling rates.
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