Mn对镁合金中杂质元素Si分布的影响及作用

In the present work, the Mg-2.5%Mn alloy was fabricated by gas protection method through melting at 750 ℃ and keeping setting time at setting temperature. The effect of manganese on the distribution of silicon in as-cast magnesium alloy has been investigated by analysis of composition, microstructure, mechanical behavior and so on. The results revealed that the phase contained Si and Mn was formed by the reaction between Mn and Mg and settled to the bottom of the ingot. Therefore, the concentration of silicon in the bottom and top was 741 ppm and 130 ppm respectively, while in the middle section was nearly 0. In addition, the impurity Fe also can be reduced by addition of Mn. The experimental indicated that the alloying element-Mn-can effectively removal the impurities-Si and Fe-in Mg alloys by the present method.