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将无水FeCl3直接添加到Mg-3Al合金熔体中进行孕育处理,研究了Fe元素对合金的晶粒细化现象和机理。结果表明,高纯Mg-3Al合金存在“本能晶粒细化”现象,当引入Fe元素时,微量的Fe可引起合金晶粒的明显粗化,但当Fe元素含量较高时,Fe的存在又能引起合金晶粒的再次细化。分析表明,Fe元素能够与高纯熔体中的含碳晶核相互作用,降低晶核的形核能力,这是Fe元素引起合金晶粒粗化的主要原因,但之后的晶粒细化现象与Al-Fe颗粒的析出无关,而更可能是形核能力已降低的形核相随着Fe含量的增加其点阵结构和参数再次发生了明显的改变,并再次成为合金凝固时的主要晶核。
The anhydrous FeCl3 was directly added into the melt of Mg-3Al alloy for inoculation, the grain refinement phenomenon and mechanism of Fe alloy were studied. The results show that there exists a phenomenon of “intrinsic grain refinement” in high purity Mg-3Al alloy. When Fe is introduced, a trace amount of Fe can cause significant coarsening of the alloy grains. However, when Fe content is high, Fe The existence of the alloy grain can cause the refinement again. The results show that the Fe element can interact with the carbon-containing nuclei in the high-purity melt to reduce the nucleation ability of the nuclei, which is the main reason for the grain-coarsening of the alloy by Fe element. However, the grain refinement It is more likely that the nucleation phase with reduced nucleation ability has nothing to do with the precipitation of Al-Fe particles. The lattice structure and parameters again changed obviously with the increase of Fe content, and again became the main crystal during the solidification of the alloy nuclear.