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- Title
Effect of Li content on electromagnetic shielding effectiveness in binary Mg–Li alloys: a combined experimental and first-principles study.
- Authors
Wang, Jiahao; Du, Chunlin; Wu, Ruizhi; Xu, Lin; Feng, Jing; Zhang, Jinghuai; Hou, Legan; Liu, Meiduo; Liu, Bin
- Abstract
The electrical conductivity and electromagnetic interference (EMI) shielding effectiveness (SE) of the as-cast Mg–xLi (x = 4, 8, 12 wt%) are investigated by combining experiments and first-principles study. The experimental results show that the increase of Li content leads to the increase of the interference of solute atoms to the movement of free electrons, which reduces the electrical conductivity of Mg–Li alloy. The Mg–4Li alloy has the optimal electrical conductivity with a value of 8.2 MS/m. The calculated densities of states (DOS) show that α-Mg has the highest structural stability and electrical conductivity, which agrees well with the results of the experiments. The Mg–8Li alloy has better EMI SE at 600–1500 MHz, which is mainly due to the increase in absorption loss caused by the multiple reflections of electromagnetic (EM) waves by the α-Mg/β-Li dual-phase structure with different impedance relationships. The electronic charge density distribution of the α-Mg(0001)//β-Li(0 1 ¯ 1)//α-Mg(0001) layer also confirms this.
- Subjects
ELECTROMAGNETIC shielding; ELECTRIC conductivity; ALUMINUM-lithium alloys; BINARY metallic systems; ELECTROMAGNETIC interference; STRUCTURAL stability; DENSITY of states
- Publication
Journal of Materials Science: Materials in Electronics, 2022, Vol 33, Issue 7, p3891
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-021-07580-0