借助电子探针(EPMA)和X射线衍射仪(XRD)研究了Ce对AZ91镁合金铸态显微组织的影响。结果表明，少量的Ce 对α-Mg基体有明显地细化作用，β-Mg17Al12相变得弥散细小，而且组织中形成了针状或杆状的Al4Ce化合物。随Ce量的增加，β-Mg17Al12相数量逐渐减少，Al4Ce化合物变得粗大。利用能谱分析和液淬技术研究了铸态组织的细化机制。
The effect of cerium addition on the microstructures of AZ91 magnesium alloy has been studied. It was found that a small amount of cerium addition to AZ91 magnesium alloy produced a large decrease in the α-Mg grain size. With increasing Ce addition, the amount of β-Mg17Al12 phase was decreased, and its size became dispersed fine. In addition, the rod-shaped or needle-like Al4Ce phases mainly distributed at grain boundaries have been observed in the AZ91 alloys with Ce addition. The grain refinement mechanism was investigated using EDS analysis and water-quenched microstructural observation. The results showed that the grain refinement of the AZ91 alloys containing Ce was mainly attributed to the addition of Ce generated constitutional undercooling at solidification interface front, consequently, increase in the number of nucleation. In addition, its restricting growth effect on the α-Mg crystals can result in the further grain refinement.
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