Enhanced Electromagnetic Interference Shielding of Mg–Zn–Zr Alloy by Ce Addition
来源期刊：Acta Metallurgica Sinica2015年第4期
论文作者：Xian-Hua Chen Li-Zi Liu Juan Liu Fu-Sheng Pan
文章页码：492 - 498
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 Mg Zn2 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 d B 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 °C for 25 or 50 h led to a further increase of 7–10 d B 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.
Xian-Hua Chen1,2，Li-Zi Liu1，Juan Liu1，Fu-Sheng Pan1,2,3
1. College of Materials Science and Engineering,Chongqing University2. National Engineering Research Center for Magnesium Alloys,Chongqing University3. Chongqing Academy of Science and Technology
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 Mg Zn2 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 d B 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 °C for 25 or 50 h led to a further increase of 7–10 d B 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.
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