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Fabrication of Cu-CuG nanocomposites with enhanced mechanical strength and reduced electrical resistivity

Publication date: March–April 2021

Source: Journal of Materials Research and Technology, Volume 11

Author(s): A.R. Eivani, A. Shojaei, N. Park, H.R. Jafarian

Republished by Plato

Published

on

open access

Abstract

Graphene was ball-milled with copper powder to acquire copper-graphene (CuG) powder. One and two percent of CuG in weight were added to stacking layers of fully annealed copper sheets and processed using 2, 4 and 6 cycles of accumulative roll bonding (ARB), leading to 2 mm thick copper-graphene nanocomposites with 20, 80 and 320 layers. With respect to the initially annealed copper sheet, the strength of the nanocomposites increased to the cost of significant loss in ductility. Reduced ductility was attributed to the low bonding quality in the form of existence of voids and the graphene chemistry which resulted in delamination and decohesion of the stacking sheets forming the nanocomposite during tensile tests. After 2 and 4 cycles of ARB, the electrical resistivity was increased which was attributed to the high density of defects and dislocations in addition to poor bonding between the stacking layers of the nanocomposite. Reduced electrical resistivity was achieved after 6 cycles of ARB which can be an indication of the improvement of the bonding at the interface of the nanoparticles with the matrix in addition to the reduction in voids at the interfaces of the stacking layers of sheets. Comparison between the nanocomposites with similarly fabricated multilayer sheets with no graphene addition indicated reduction in resistivity which demonstrates the positive effects of graphene on reducing resistivity. Mechanical strength, ductility and electrical resistivity were found to improve in the nanocomposite with 2% of CuG addition which was followed by further reduction in resistivity by full annealing.

Keywords

Copper

Graphene

Nanocomposite

Mechanical properties

Resistivity

© 2021 The Authors. Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785421000454?dgcid=rss_sd_all

Material

Corrigendum to “A facile way to modify carbon fibers and its effect on mechanical properties of epoxy compositesˮ [J Mater Res Technol 10 (2021) 164–174]

Publication date: March–April 2021

Source: Journal of Materials Research and Technology, Volume 11

Author(s): Hongwei He, Tao Zhang, Yongkang Yang

Republished by Plato

Published

on

ScienceDirect ® is a registered trademark of Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785421001472?dgcid=rss_sd_all

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Material

Fabrication and characterization of Au/Cr and Cr/Au Multilayered plasmonic nanofilms for sensing applications

Publication date: March–April 2021

Source: Journal of Materials Research and Technology, Volume 11

Author(s): Mohammed Shaban, Abdullah Almohammedi, Shreef Shaban, Mohamed Mourad, Khulood Abu Al-Ola, Waleed Osman

Republished by Plato

Published

on


Elsevier
Volume 11, March–April 2021, Pages 1868-1880
Journal of Materials Research and Technology

open access

Abstract

A highly sensitive/selective heavy metals and C2H2 gas-sensing structures utilizing plasmonic nanostructured films, mainly Au and Cr-based are fabricated using radio frequency magnetron sputtering. The chemical composition, morphological, and optical properties of the designed sensors are studied with various techniques. Scanning electron microscopy (SEM) images reveal the growth of winkle network Au and Cr nanostructured thin layers on glass substrates. To confirm the chemical compositions of the prepared Au and Cr nanostructures, Raman and energy-dispersive X-ray (EDX) spectra have been investigated. From 200 to 2500 nm, the optical transmission/reflection/absorption spectra have been studied. The spectra showed absorption band tuned from visible to infrared region with tuned optical band gap (Egop) from 1.94 eV for Au(4)/Cr(4) to 1.49 eV for Au(2)/Cr(2) versus 1.5 and 2.25 eV for Cr(4)/Au(4). The 4-layered Cr/Au/glass and Au/Cr/glass films are tested as Hg2+ sensors and C2H2 gas sensors. Heavy metals sensing property utilizing surface-enhanced fluorescence reveals high sensitivity upon the addition of Hg2+ ions (0.1–10 μM) and high selectivity against Cd2+ and Pb2+ (10 μM). The gas sensing sensitivity, detection limit, recovery time, and response time are estimated and presented at different gas concentrations. The sensitivity of the sensors reached 96.0% and 97.9% @100 sccm for Au/Cr/glass and Cr/Au/glass sensors, respectively. The Cr/Au/glass sensor (tres = 42 s, trecov = 58 s @20 sccm) showed smaller response and recovery times than the Au/Cr/glass sensor (tres = 52 s, trecov = 77.7 s @20sccm).

Keywords

C2H2 Gas sensor

Multilayered nanofilms

Surface plasmon

Electrical properties

RF sputtering

© 2021 The Authors. Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785421001009?dgcid=rss_sd_all

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Material

A new approach of predicting dynamic recrystallization using directly a flow stress model and its application to medium Mn steel

Publication date: March–April 2021

Source: Journal of Materials Research and Technology, Volume 11

Author(s): Mohd Kaswandee Razali, Man Soo Joun

Republished by Plato

Published

on


Elsevier
Volume 11, March–April 2021, Pages 1881-1894
Journal of Materials Research and Technology

open access

Abstract

We present a new approach of predicting the dynamic recrystallization (DRX) of an alloy steel during hot compression testing with an emphasis on higher solution accuracy and practicability than the Johnson-Mehl-Avrami-Kolmogorov (JMAK) model approach. We use not only an accurate closed-form function (CFF) flow stress model which allows to exclude modelling of the strain at 50% recrystallization but also an Avrami kinetics model with improved parameters formulated as the CFFs of state variables; this enhances generality, flexibility, and accuracy. Comparisons of the fitted and experimental flow stresses revealed that accuracy is excellent; the average and maximum errors are less than 2.83% and 4.61%, respectively. The average error of the fitted DRX volume fraction

(Xdrx)

values in our approach is 5.15% (standard deviation of 2.35%), which is considerably low. The comparison of the grain sizes predicted by the new approach with those by the JMAK model approach also showed that the former is closer to the experimental data than the latter.

Keywords

Dynamic recrystallization

Closed-form function

Flow stress model

Avrami kinetics model

Generality

Flexibility

© 2021 The Authors. Published by Elsevier B.V.

Source: https://www.sciencedirect.com/science/article/pii/S2238785421001526?dgcid=rss_sd_all

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