Abstract
The morphological evolution of Fe-rich phases in the AlSi9Cu3Mg0.19(Fe) alloy has been investigated with various contents of Fe, Mn, and Cr. The results show that coarse Chinese script Fe-rich phases appear in the alloy with 0.6 wt% Fe combined with trace Mn, while the blocky Fe-rich phases appear combined with trace Cr. Under the coexistence of trace Mn and Cr, a large number of fine Chinese script Fe-rich phases could be visible in the low iron-bearing AlSi9Cu3Mg0.19(Fe) alloy (0.60 wt%). At high Fe level (1.30 wt%), numerous Fe-rich phases with hexagonal morphologies are observed with the trace Cr, while fish-bone and pentagonal morphologies of Fe-rich phases could be simultaneously observed with the addition of both Mn and Cr. The results reveal that the trace Mn and Cr promote the morphological evolution of Fe-rich phases. The morphology evolution mechanism of Fe-rich phases has been discussed by using the atom radius and electronegativity differences of Fe, Mn, and Cr.
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