Microstructure and Electromagnetic Shielding Properties of Mg-Zn-Ce-Y-Zr Alloys

Journal Article · Sat Sep 15 04:00:00 EDT 2018 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-018-3611-4· OSTI ID:22860247

Liu, Lizi; Chen, Xianhua; Wang, Hui ^[1]; Pan, Fusheng ^[2]; Wang, Jingfeng ^[1]

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1. Chongqing University, College of Materials Science and Engineering (China)
2. Chongqing University, National Engineering Research Center for Magnesium Alloys (China)

Microstructure and electromagnetic interference shielding properties of extruded Mg-Zn-Ce-Y-Zr alloys were systematically investigated. A bimodal grain structure of fine recrystallized grains and deformed grains was observed in the alloys. Yttrium (Y) and cerium (Ce) refined the recrystallized grains. Mg-Zn-Ce phase, Mg{sub 3}Zn{sub 3}Y{sub 2} phase and a few precipitates containing Zn and Zr were observed. Y and Ce additions changed the texture of the alloys. When the total rare earth content reached 4 wt.%, the texture was remarkably weaker than other studied alloys. The shielding capacity increased first and then decreased with Y contents. The value of shielding effectiveness for the extruded Mg-5Zn-1Ce-2Y-0.6Zr alloys reached 79-118 dB in the frequency range of 30 MHz-1.5 GHz, which was significantly higher than that of some aluminum alloys. The addition of Y and Ce is effective in improving the shielding capacity in Mg alloys. The electrical conductivity and second phases in the alloys were important in enhancing shielding effectiveness. The texture and precipitation exerted significant effect on electrical conductivity. In addition, subsequently aging treatment evidently improved shielding effectiveness.

• OSTI ID: 22860247
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 9 Vol. 27; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY SYSTEMS
CERIUM COMPOUNDS
ELECTRIC CONDUCTIVITY
INTERFERENCE
MAGNESIUM COMPOUNDS
MAGNETIC PROPERTIES
MICROSTRUCTURE
PRECIPITATION
TEXTURE
YTTRIUM COMPOUNDS
ZINC COMPOUNDS
ZIRCONIUM COMPOUNDS