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通过光学显微镜、扫描电镜研究了含长周期相(LPSO)铸态Mg-Zn-Y合金的显微组织。并对铸态Mg-Zn-Y合金进行了电磁屏蔽性能研究。结果表明:该合金的显微组织主要由树枝晶状α-Mg相和晶界处的LPSO相组成,且随着Zn、Y元素含量的增加,该合金的晶粒尺寸明显减小,LPSO相体积分数增加。随着Zn、Y元素含量不断增加,合金的电导率和电磁屏蔽性下降。此外合金的电磁屏蔽性能随频率的提高而下降。Mg_(97)Zn_1Y_2合金的电导率和电磁屏蔽性能最优,分别为18.5 MS/m和f=100 Hz,SE=96 d B;f=1500 Hz,SE=84 d B。
The microstructure of as-cast Mg-Zn-Y alloy with long period phase (LPSO) was studied by optical microscope and scanning electron microscope. The electromagnetic shielding performance of as-cast Mg-Zn-Y alloy was also studied. The results show that the microstructure of the alloy mainly consists of the dendritic α-Mg phase and the LPSO phase at the grain boundary. With the increase of the contents of Zn and Y, the grain size of the alloy decreases obviously. The LPSO phase The volume fraction increases. With the increasing of Zn and Y, the conductivity and electromagnetic shielding of the alloy decrease. In addition, the electromagnetic shielding properties of the alloy decrease with increasing frequency. The conductivity and electromagnetic shielding properties of Mg_ (97) Zn_1Y_2 alloy were the best, 18.5 MS / m and f = 100 Hz, SE = 96 dB respectively; f = 1500 Hz and SE = 84 dB.