The Mg-3% Al melt was treated by carbon inoculation and Fe addition. The influence of Fe on the formation of nucleation was investigated. That Fe inhibited the grain refinement of the carbon-inoculated Mg-3%Al alloy or not was closely associated with the operating sequence of carbon inoculation and Fe addition. Under the condition of Fe addition firstly and then carbon inoculation, the Al4C3particles and the particles with duplex phase structure of Al4C3coated on Al-C-Fe or Al-Fe could be observed. Both kinds of particles should act as nucleating substrates for a-Mg grains, resulting in no obvious effect of Fe on refining efficiency of carbon inoculation. Under the contrary condition, the potency of Al4C3nucleating substrates was poisoned by transforming Al4C3into Al-C-Fe-rich intermetallic particles, resulting in grain-coarsening.
The effect of combined addition of Fe and Mn on carbon inoculation of Mg-3% Al alloy was investigated in the present study. The results show that a posioning effect could be found in the samples treated by the combination of carbon inoculation and combined addition of Fe and Mn regardless of the operating sequence of carbon inoculation and combined addition of Fe and Mn. The posioning effect was proposed to be due to the formation of Al-C-O-Mn-Fe-rich intermetallic compounds. These Al-C-O-Mn-Fe-rich intermetallic compounds, actually being Al-C-Mn-Fe phases, should not act as the potent nucleating substrates for -Mg grains, resulting in the grain-coarsening.
The Mg-3% Al melt was treated by carbon inoculation and Mn addition. The effects of Mn addition and addition sequence on the grain refinement were investigated. The effect of Mn on the grain refinement of Mg-3 %Al alloy by carbon inoculation was closely associated with the operating sequence of carbon inoculation and Mn addition.Mn has no obvious effect on the grain refinement under the condition that Mn pre-existed in the Mg-Al melt before carbon inoculation. However, Mn played an inhibiting role under the condition that the Mg-Al melt had been inoculated by carbon before Mn addition. The Al4C3 particles should act as potent nucleating substrates for Mg grains in the sample treated by carbon inoculation. However, the Al-C-Mn particles with Al4C3 coating film could be observed in the sample treated by Mn addition and then carbon inoculation. These particles with duplex phase structure should also act as potent nucleating substrates for Mg grains, resulting in grain refinement. The nucleating potency of most Al4C3 particles was possibly poisoned by the formation of Al-Mn-rich coating film or the Al-C-Mn intermetallic compound, resulting in grain coarsening in the samples treated by carbon inoculation before Mn addition.
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