Effects of Y and Zn additions on electrical conductivity and electromagnetic shielding effectiveness of Mg-Y-Zn alloys

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2019,（6）
• 页码范围: 1074-1080
• 页数: 7页
• 语种: 英文

摘要

Microstructure,electrical conductivity,and electromagnetic interference (EMI) shielding effectiveness (SE) of cast Mg-xZn-yY (x =2-5,y =1-10) alloys were systematically investigated to understand the effects of Zn and Y additions on electrical conductivity and electromagnetic shielding effectiveness of the alloys.Experimental results indicate that the electrical conductivity and SE of the Mg-xZn-yY alloys decrease with Y/Zn ratio.Electrical conductivity is the main factor that affects the electromagnetic shielding properties and the variation tendency of electromagnetic shielding properties of the Mg-xZn-yY alloys is consistent with conductivity.Valence of Y and Zn atoms,configuration of extranuclear electron and volumetric difference are main reasons for the variations in the electrical conductivity.A high density of second phase and the formation of semi-continuous network structure can also improve the SE value at high frequencies.