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通过X射线衍射(XRD)、扫描电镜(SEM)及能谱分析、电化学腐蚀等测试手段,研究了AZ91D合金加入(0%,0.5%,1%,2%,3%)Sm以后,合金的微观组织及耐腐蚀性能的变化。结合镁合金的腐蚀机理,其结果表明,随着稀土Sm含量的逐渐增加,合金中的第二相Mg17Al12逐渐断裂,体积分数也随之减少,并撑不连续分布,同时稀土Sm与Al结合形成白亮的颗粒状的Al3Sm相;合金的耐腐蚀性能随着Sm含量的增多而增强。
The effects of the addition of 0%, 0.5%, 1%, 2% and 3% Sm on the wear resistance of AZ91D alloy were studied by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy and electrochemical corrosion tests. The microstructure and corrosion resistance of the changes. Combined with the corrosion mechanism of magnesium alloy, the results show that with the increasing of Sm content, the second phase Mg17Al12 in the alloy gradually breaks down, the volume fraction also decreases and sustains discontinuous distribution, and the combination of rare earth Sm and Al forms White bright granular Al3Sm phase; the corrosion resistance of the alloy increases with the increase of Sm content.