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

Liu, Lizi; Chen, Xianhua; Wang, Jingfeng; Qiao, Liang; Gao, Shangyu; Song, Kai; Zhao, Chaoyue; Liu, Xiaofang; Zhao, Di; Pan, Fusheng

doi:10.1016/j.jmst.2018.12.010

Cited by 82 publications

(27 citation statements)

References 38 publications

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“…Then the formation of W-phase should dependent on the Zn/ (Y, Ce) ratio which is calculated to be 0.92 and 1.72 in the Alloy III and Alloy IV, respectively. Such results are consistent with that reported by Lizi Liu et al [33]. Additionally, in case of T-phase, due to its lower eutectic reaction temperature and larger amounts of Zn element requirement, it only appears in Alloy IV.…”

Section: Effect Of Zn Addition On the Ternary Phase Formationsupporting

confidence: 93%

“…It is found that the Zn/Y weight ratio that required in precipitating the LPSO phase, the LPSO phase +W-phase and the W-phase is in the range of less than 0.6, 0.65∼0.85 and 0.85∼2.05, respectively [12,13]. However, in the recent, Lizi Liu et al report that the Zn/Y ratios in the range of 0.44∼0.53, 0.9∼1.0 and 2.32∼3.22 correspond to the formation of LPSO phase, W-phase+LPSO phase and W-phase+I-phase, respectively [33]. In the present work, based on the actual composition as shown in table 1, the actual Zn/Y weight ratio increasing with more Zn addition, which is 0.47, 1.28 and 2.38 respectively in the Alloy II, Alloy III and Alloy IV, can meet the requirements of chemical composition for forming LPSO phase, LPSO phase +W-phase and W-phase.…”

Section: Effect Of Zn Addition On the Ternary Phase Formationmentioning

confidence: 98%

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Effect of Zn addition on the microstructures and mechanical behaviors of As-cast Mg-2.5Y-1Ce-0.5Mn alloy

Zhang

Sun

Liu

et al. 2020

Mater. Res. Express

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The effect of Zn addition on the microstructures and mechanical behaviors of as-cast Mg-2.5Y-1Ce-0.5Mn alloy was investigated. Microstructure observation demonstrated that with the addition of 1wt%, 3wt% and 5wt% Zn, the ternary phases of LPSO phase, LPSO phase +W-phase and W-phase +T-phase (Mg-Zn-Ce) are precipitated orderly, and the volume fraction of eutectic phases increases. The results of tensile tests demonstrated that with increasing Zn addition, the yield strength s YS ( )of as-cast alloys increases continuously while the ultimate tensile strength s UTS ( )and elongation d ( ) increase nonlinearly. Based on the analysis of microstructure, nanoindentation results and deformation surfaces, it found that the s YS is increased by the increased volume fraction of hard ternary phases. The largest d in 1wt% Zn alloy is contributed from the LPSO phase with an excellent plastic accommodation while the insufficient accommodated role of LPSO phase and the easily broken W-phase deteriorate the ductility of 3wt% Zn alloy. The hard and brittle T-phase also damages the ductility, while the fine grains contribute to the moderate elongation in 5wt% Zn alloy. The s UTS mainly arises from a sustainable increase of strain hardening ability after yielding that associated with both the high yielding point and excellent ductility.

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Section: Effect Of Zn Addition On the Ternary Phase Formationsupporting

confidence: 93%

Section: Effect Of Zn Addition On the Ternary Phase Formationmentioning

confidence: 98%

Effect of Zn addition on the microstructures and mechanical behaviors of As-cast Mg-2.5Y-1Ce-0.5Mn alloy

Zhang

Sun

Liu

et al. 2020

Mater. Res. Express

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“…The electromagnetic shielding effect of materials can be characterized by the shielding effectiveness (SE) [4]. For high-frequency electromagnetic waves, some high-conductivity materials, such as copper, aluminum and magnesium, have a good SE, and for low-frequency electromagnetic waves, high-magnetic permeability materials have good effects, such as ferrite and steel [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg–9Li–3Al–1Zn Alloy Processed by Accumulative Roll Bonding

Wang

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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High electromagnetic shielding performance was achieved in the Mg-9Li-3Al-1Zn alloy processed by accumulative roll bonding (ARB). The microstructure, electromagnetic interference shielding effectiveness (SE) in the frequency of 30-1500 MHz and mechanical properties of the alloy were investigated. A model based on the shielding of the electromagnetic plane wave was used to theoretically discuss the EMI shielding mechanisms of ARB-processed alloy. Results indicate that the SE of the material increases gradually with the increase in the ARB pass. The enhanced SE can be attributed to the obvious microstructure orientation caused by ARB, and the alternative arrangement of alpha(Mg) phase and beta(Li) phase. In addition, with the increase in ARB pass, the number of interfaces between layers increases and the grain orientation of each layer tends to alignment along c-axis, which is beneficial to the reflection loss and multiple reflection loss of the incident electromagnetic wave.

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“…Generally, it requires different dielectric properties to meet diverse application requirements [1] . For example, capacitors require the high permittivity and low dissipation [2] , while a large dissipation with moderate permittivity is suitable for microwave absorption [3] . Moreover, the dielectric constant and dissipation in wave-transmitting materials are commonly small [4] .…”

Section: Introductionmentioning

confidence: 99%

Negative permittivity derived from inductive characteristic in the percolating Cu/EP metacomposites

Sun

Xin

et al. 2019

Journal of Materials Science & Technology

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Recently, increasing attention has been concentrated on negative permittivity with the development of the emerging metamaterials composed of periodic array structures. However, taking facile preparation into consideration, it is important to achieve negative permittivity behavior based on materials' intrinsic properties rather than their artificially periodic structures. In this paper, we proposed to fabricate the percolating copper/epoxy resin (Cu/EP) composites by a polymerization method to realize the negative permittivity behavior. When Cu content in the composites reached to 80 wt.%, the conductivity abruptly went up by three orders of magnitudes, suggesting a percolation behavior. Below the percolation threshold, the conductivity spectra conform to Jonscher's power law; when the Cu/EP composites reached to percolating state, the conductivity gradually reduced in 2 high frequency region due to the skin effect. It is indicated that the conductive mechanism changed from hopping conduction to electron conduction. In addition, the permittivity did not increase monotonously with the increase of Cu content in the vicinity of percolation threshold, due to the presence of leakage current. Meanwhile, the negative permittivity conforming to Drude model was observed above the percolation threshold. Further investigation revealed that there was a constitutive relationship between the permittivity and the reactance. When conductive fillers are slightly above the percolation threshold, the inductive characteristic derived from conductive percolating network leads to the negative permittivity. Such epsilon-negative materials can potentially be applied in novel electrical devices, such as high-power microwave filters, stacked capacitors, negative capacitance field effect transistors and coil-free resonators. In addition, the design strategy based on percolating composites provides an approach to epsilon-negative materials.

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

Cited by 82 publications

References 38 publications

Effect of Zn addition on the microstructures and mechanical behaviors of As-cast Mg-2.5Y-1Ce-0.5Mn alloy

Effect of Zn addition on the microstructures and mechanical behaviors of As-cast Mg-2.5Y-1Ce-0.5Mn alloy

Enhanced Electromagnetic Interference Shielding in a Duplex-Phase Mg–9Li–3Al–1Zn Alloy Processed by Accumulative Roll Bonding

Negative permittivity derived from inductive characteristic in the percolating Cu/EP metacomposites

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