Effect of Zn content on electromagnetic interference shielding effectiveness of Mg–Zn alloys

Song, Kai; Pan, Fu Sheng; Chen, X.; Tang, Aitao; Pan, Hucheng; Luo, Siyi

doi:10.1179/1432891714z.000000000676

Cited by 12 publications

(17 citation statements)

References 31 publications

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“…Identifying strong peaks corresponding to Mg-Zn intermetallics is difficult as the fraction of these phases is lower. However, the peaks with lower intensities were observed and identified by comparing with the available literature [19,20] before heat treatment. The corresponding intensities were observed as decreased after heat treatment at 300 °C that indicates the reduced MgZn 2 phase.…”

Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Syam

Kondaiah²,

Akhil

et al. 2019

Koroze a Ochrana Materialu

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Magnesium and its alloys are now attracting a great attention as promising materials for several light weight engineering applications. ZE41 is a new Mg alloy contains Zinc, Zirconium and Rare Earth elements as the important alloying elements and is widely used in aerospace applications. In the present study, heat treatment has been carried out at two different temperatures (300 and 335 °C) to assess the effect of heat treatment on microstructure and corrosion behavior of ZE41 Mg alloy. The grain size was observed as almost similar for the unprocessed and heat treated samples. Decreased amount of secondary phase (MgZn2) was observed after heat treating at 300 °C and increased intermetallic phase (Mg7Zn3) and higher number of twins appeared for the samples heat treated at 335 °C. Microhardness measurements showed increased hardness after heat treating at 300 °C and decreased hardness after heat treating at 335 °C which can be attributed to the presence of higher supersaturated grains after heat treating at 300 °C. The samples heat treated at 335 °C exhibited better corrosion resistance compared to those of base materials and samples heat treated at 300 °C. From the results, it can be understood that the selection of heat treatment temperature is crucial that depends on the requirement i.e. to improve the microhardness or at the loss of microhardness to improve the corrosion resistance of ZE41 Mg alloy.

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Section: Resultsmentioning

confidence: 99%

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Syam

Kondaiah²,

Akhil

et al. 2019

Koroze a Ochrana Materialu

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“…Song et al . reported that increasing Zn content decreases the EMI SE of cast and solutionized alloys 17 . Subsequent studies revealed that converting the random texture of the alloy to basal texture improves SE.…”

Section: Introductionmentioning

confidence: 96%

Effect of secondary phase on the electromagnetic shielding effectiveness of magnesium alloy

Gao

Chen

Pan

et al. 2018

Sci Rep

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The microstructure, electrical conductivity, and electromagnetic interference (EMI) shielding effectiveness (SE) of Mg-xZn and Mg-xSn (x = 3,5) alloys prepared under different rolling and heat treatment conditions were systematically investigated to understand the effect of secondary-phase orientation on the electromagnetic-shielding property of magnesium alloys. Alloys were rolled to form basal textures and then subjected to different durations of solid-solution treatment and aging to induce the precipitation of secondary-phase particles along a specific direction. Experimental results indicated that in Mg-Zn and Mg-Sn alloys, secondary phases precipitated along directions perpendicular and parallel to the basal plane, respectively. When the direction of the incident electromagnetic wave is perpendicular to the basal plane, precipitates in Mg-Sn alloy parallel to the basal plane improve SE. The increment in SE is mainly attributed to the improvement in the reflection and multiple reflection losses of incident electromagnetic waves, which are caused by increasing the amounts of precipitates with specific orientations. Mg-5Sn alloy subjected to 16 h of solution treatment at 480 °C and 60 h of artificial aging at 170 °C for 60 h exhibited the maximum value of 107–89 dB and maximum increment in SE of 13 dB at 1200 MHz.

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“…This result suggests that the Cu-Zn coating can only sustain and use the EMI shielding application if the coating thickness is considered 100 µm. The addition of Zn improved the EMI shielding effectiveness significantly [ 43 ]. Moreover, as the frequency increased from 0.1 to 1 GHz, the shielding effectiveness of 100 µm Cu and Cu-Ni coatings decreased gradually, which is attributed to the decrease in reflection and increase in absorption loss of the electromagnetic waves.…”

Section: Resultsmentioning

confidence: 99%

“…The Al-Zn coating has been deposited by arc thermal spray process onto the steel plate as well as concrete substrate, which shows the significant improvement in EMI attributed to the reflection loss [ 41 , 42 ]. Zn content increases the shielding value in the T6 states of Mg-4Zn alloys [ 43 ]. Cu is the metal being used as EMI shielding materials owing to its high absorption capacity of radio and magnetic waves as well as electrical conductivity, which is identical to silver and is economical [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

2020

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Advancement in electronic and communication technologies bring us up to date, but it causes electromagnetic interference (EMI) resulting in failure of building and infrastructure, hospital, military base, nuclear plant, and sensitive electronics. Therefore, it is of the utmost importance to prevent the failure of structures and electronic components from EMI using conducting coating. In the present study, Cu, Cu-Zn, and Cu-Ni coating was deposited in different thicknesses and their morphology, composition, conductivity, and EMI shielding effectiveness are assessed. The scanning electron microscopy (SEM) results show that 100 µm coating possesses severe defects and porosity but once the thickness is increased to 500 µm, the porosity and electrical conductivity is gradually decreased and increased, respectively. Cu-Zn coating exhibited lowest in porosity, dense, and compact morphology. As the thickness of coating is increased, the EMI shielding effectiveness is increased. Moreover, 100 µm Cu-Zn coating shows 80 dB EMI shielding effectiveness at 1 GHz but Cu and Cu-Ni are found to be 68 and 12 dB, respectively. EMI shielding effectiveness results reveal that 100 µm Cu-Zn coating satisfy the minimum requirement for EMI shielding while Cu and Cu-Ni required higher thickness.

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Effect of Zn content on electromagnetic interference shielding effectiveness of Mg–Zn alloys

Cited by 12 publications

References 31 publications

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Effect of heat treatment on microstructure, microhardness and corrosion resistance of ZE41 Mg alloy

Effect of secondary phase on the electromagnetic shielding effectiveness of magnesium alloy

Electromagnetic Shielding Performance of Different Metallic Coatings Deposited by Arc Thermal Spray Process

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