Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition

作     者：Xian-Hua Chen Li-Zi Liu Juan Liu Fu-Sheng Pan 

作者机构：College of Materials Science and EngineeringChongqing University National Engineering Research Center for Magnesium AlloysChongqing University Chongqing Academy of Science and Technology 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2015年第28卷第4期

页      面：492-498页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by International Science & Technology Cooperation Program of China (Nos.2014DFG52810 and 2013DFA71070) National Natural Science Foundation of China (No.51474043) Chongqing Science and Technology Commission (No.CSTC2013JCYJC60001) Fundamental Research Funds for the Central Universities (Grant CDJZR13130086) 

主　　题：Magnesium alloys Ce Shielding effectiveness Electromagnetic interference Intermetallicparticles 

摘      要：The effects of Ce addition on microstructure and electromagnetic interference （EMI） shielding response of Mg- 6Zn-0.5Zr （ZK60） alloy have been investigated. Ce addition resulted in grain refinement and higher density of Mg-Zn-Ce and MgZn2 intermetallic particles in the alloy. In particular, this was substantially remarkable as the addition of Ce was up to 1.0 wt%. It is interesting to note that as-extruded ZK60 alloy with 1.0 wt% Ce addition exhibited an EMI shielding effectiveness （SE） exceeding 70 dB at the frequency range of 30-1,500 MHz, which was significantly higher than that of ZK60 alloy without Ce addition and reached the requirement of high protection. The superior SE was probably related to the increased reflection and multiple reflection of electromagnetic radiation induced by Ce addition. Direct artificial aging at 150 ℃ for 25 or 50 h led to a further increase of 7-10 dB in the SE of the alloy with 1.0 wt% Ce addition. The advantages of excellent shielding capacity and favorable mechanical strength make the Mg-Zn-Zr-Ce alloy an attractive shielding candidate material for a variety of technological applications.