Abstract
Magnesium (Mg)–3% aluminum (Al) (in weight) alloy was modified by carbon (C) inoculation combining with strontium (Sr). The effects of trace 0.1% iron (Fe) addition and operating sequence of carbon-inoculation and Fe addition on the grain size of Mg–3%Al alloy were studied. The results reveal that the Sr addition could effectively suppress grain-coarsening resulted from the inclusion of Fe in the carbon-inoculated Mg–Al alloy. Sr addition could contribute to the formation of the duplex-phase particles that Al–C-rich phases coated on Al–Fe or Al–C–Fe-rich phases, regardless of the Fe addition sequence. These duplex-phase particles should be the potent substrates for α-Mg grains. Consequently, Sr addition could effectively subsidize the inhibiting effect of Fe on grain refinement and the active nuclei were maintained. In other words, Sr plays a counter role in the poisoning effect of Fe on the microstructure of Mg–3%Al alloy.
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