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研究了稀土Ce对AS31合金组织和力学性能的影响。结果表明,稀土Ce的加入改善了AS31合金中共晶Mg_2Si相的形态、尺寸和分布。随着稀土Ce加入量的增加,共晶Mg_2Si相的尺寸呈现先减小后增大的趋势。当Ce加入量为0.9%时,合金中共晶Mg_2Si相形貌由粗大汉字状转变为蠕虫状和颗粒状,其尺寸也减小到30μm左右,此时变质效果最佳。同时随着稀土Ce的增加,合金的抗拉强度和伸长率呈现先升高后下降的趋势,这与合金中共晶Mg_2Si相尺寸的变化一致。
The effect of rare earth Ce on the microstructure and mechanical properties of AS31 alloy was studied. The results show that the addition of rare earth Ce improves the morphology, size and distribution of eutectic Mg_2Si phase in AS31 alloy. With the addition of rare earth Ce, the size of eutectic Mg_2Si phase first decreases and then increases. When the amount of Ce added is 0.9%, the morphology of eutectic Mg_2Si phase in the alloy changes from coarse Chinese character to wormlike and granular, and its size is also reduced to about 30μm, and the metamorphic effect is the best. At the same time, with the increase of rare earth Ce, the tensile strength and elongation of the alloy first increased and then decreased, which is consistent with the change of the size of the eutectic Mg_2Si phase in the alloy.