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The influence of K addition on the Fe-containing intermetallic compounds in Fe-rich AA319 Al alloys has been investigated. At 0.5wt.% Fe level, K modifies the platelet β-Al 5 FeSi compound into the Chinese script α-Al 8 Fe 2 Fi compound. Moreover, K addition modifies the eutectic Si simultaneously.
The influence of Li addition on the Fe-containing intermetallic compounds in Al-6.5%Si-3.5%Cu-1%Fe cast alloys (in wt%) has been investigated. Li successfully modifies the morphology of the β-Al 5 FeSi phase from coarse intersected and branched platelets into finer and independent ones.
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