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Nucleating role of an effective in situ Mg_3P_2 on Mg_2Si in Mg-Al-Si alloys

机译:有效原位Mg_3P_2对Mg-Al-Si合金中Mg_2Si的成核作用

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摘要

Refinement and modification effects of the A1-3.5P master alloy on Mg_2Si phases in Mg-4Al-2Si alloys were studied in this work. Mg_2Si phases in Mg-4Al-2Si alloys can be modified well at 740°C with the addition of 1.5% A1-3.5P master alloy. The mean size of primary Mg_2Si decreases from about 70ìm to less than 15 ìm, and the morphology changes from coarse dendritic or equiaxed to polygonal shape. In addition, the amount of eutectic Mg_2Si obviously decreases and the morphology changes from coarse Chinese script to fine fiber shape. XRD and EPMA results show that a reaction between A1P and Mg occurs in the melt forming a new Mg_3P_2 phase which serves as the heterogeneous nucleation substrates of Mg_2Si.
机译:研究了Al-3.5P中间合金对Mg-4Al-2Si合金中Mg_2Si相的细化和改性作用。 Mg-4Al-2Si合金中的Mg_2Si相可以在740°C下加入1.5%的Al-3.5P中间合金进行很好的改性。初生Mg_2Si的平均尺寸从大约70μm减小到小于15μm,并且形态从粗大的树枝状或等轴变为多边形。另外,共晶Mg_2Si的含量明显减少,其形态从粗大的中文字变为细纤维状。 XRD和EPMA结果表明,AlP与Mg之间发生反应,形成新的Mg_3P_2相,该相作为Mg_2Si的异相成核基质。

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