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采用金相显微镜 、扫描电镜（ＳＥＭ）和力学性能检测等方法，研究了微量Ｓ ｃ对Ａｌ－５％Ｍｇ合金显微组织、力学性能和断口形貌的影响。结果表明，添加０．１７％Ｓｃ的合金铸态组织得到显著细化，枝晶组织在相当程度上得到消除，直到５７ ５℃合金仍然保持着大量的变形组织；添加钪的合金在高温退火后可以保留较高的强度，但合金塑性比普通Ａｌ－Ｍｇ合金要低。
The effects of trace S c on the microstructure, mechanical properties and fracture morphology of Al-5% Mg alloy were studied by means of optical microscope, scanning electron microscopy (SEM) and mechanical properties testing. The results show that the as-cast microstructure of the alloy containing 0.17% Sc is remarkably refined, and the dendritic structure is largely eliminated until a large amount of deformation structure is retained at 575 ° C. After the alloy with scandium is annealed Higher strength can be retained, but the plasticity of the alloy is lower than that of ordinary Al-Mg alloy.