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Journal of Alloys and Compounds
Elsevier Science S.A.
Journal of Alloys and Compounds

Elsevier Science S.A.

0925-8388

Journal of Alloys and Compounds/Journal Journal of Alloys and CompoundsSCIISTPEI
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    Fabrication of high performance supercapacitors based on ethyl methyl imidazolium bis(trifluoromethylsulfonyl) imide (EMIMTFSI)-decorated reduced graphene oxide (rGO)

    Mohsenipour A.Mozaffarian M.Pazuki G.Naji L....
    10页
    查看更多>>摘要：In this paper, we outline the construction of symmetric supercapacitors comprised of reduced graphene oxide (rGO) and hydrophobic ionic liquid (IL) (1-ethyl-3-methylimidazolium bis(trifluoromethyl sulfonyl)imide (EMIMTFSI) acting as physical spacer and electrolyte between rGO plates. To increase the porosity and interlayer spacing between the graphene plates, different solvents are analyzed by Hansen solubility parameters’ approach (HSP). Accordingly, the solubility performances of two solvents, namely Tween 80 and N, N-dimethylformamide (DMF), coupled with rGO and IL, are deemed to offer the most beneficial results, and they are the solvents used in this study to develop rGO/Tween 80/IL and rGO/DMF/IL electrodes. The comparison of the electrodes’ performances shows that the consumption of 80 wt percent IL would deliver the optimum electrochemical performance and capacitance results. At room temperature, the prepared rGO/Tween 80/IL80% and rGO/DMF/IL80% deliver capacitances of 375 and 213 F/g, respectively. The maximum energy density of rGO/Tween 80/IL electrode is 187.5 Wh/kg at a power density of 1125 W/kg, while for the rGO/DMF/IL electrode the maximum energy density reaches 106.5 Wh/kg at a power density as high as 639 W/Kg. The supercapacitors prepared based on rGO/Tween 80/IL80% and rGO/DMF/IL80% electrodes show capacitance retention of 90% and 84% after 10,000 charge-discharge cycles, respectively. This design approach eliminates the need for the prevalant stand-alone type of electrolyte in supercapacitors, and instead, the electrolyte is incorporated as a component of electrode's structure.
      原文链接:
    • NSTL
    • Elsevier

    Plasma electrolytic oxidation of cold spray kinetically metallized CNT-Al coating on AZ91-Mg alloy: Evaluation of mechanical and surficial characteristics

    Zhang Y.Wang Q.Ye R.Ramachandran C.S....
    10页
    查看更多>>摘要：The cold-spray kinetically metallized (CS) carbon nanotube-aluminum (CNT-Al) and pure Al coatings were treated using plasma electrolytic oxidation (PEO) process to obtain CNT-Al+PEO and Al+PEO duplex coatings on AZ91 Mg alloy, respectively. The phase composition, microstructure, mechanical properties, wear and corrosion resistance of the PEO ceramic coatings were studied. The results showed that the PEO ceramic coating was mainly composed of α-Al2O3 and γ-Al2O3, moreover, the small amount of CNT was also retained during the PEO process. The mechanical properties and wear resistance of the PEO ceramic coatings were significantly improved compared to the respective CS coatings. In particular, the hardness and elastic modulus of the PEO-CNT coating reached 13.9 GPa and 185.4 GPa, which were 21.0% and 23.4% higher than the respective CS coating. Moreover, the wear rate of the PEO-CNT coating was only 4.83 × 10?5 mm3/N·m with a relatively low coefficient of friction of 0.65, which were 59.8% and 15.6% lower than the corresponding CS coating. The corrosion current density of the PEO-treated CNT-Al coating was 3.734 × 10?6A/cm2, which was similar to the untreated CS coating. In short, the PEO treatment greatly improves the mechanical properties and wear resistance of the CS CNT-Al coating.
      原文链接:
    • NSTL
    • Elsevier

    From magnetic cluster glass state to giant vertical magnetization shift induced by ferromagnetic cluster growth in SrFe0.25Co0.75O2.63

    Chennabasappa M.Toulemonde O.Pautrat A.
    6页
    查看更多>>摘要：A charge ordering phenomenon within the crystallographic sites as following Sr4(Fe0.143+Co0.363+)48h(Fe0.114+Co0.144+Co0.253+)48fO10.52 was previously reported thanks to neutron diffraction coupled with Mossbauer spectroscopy studies. Such distribution supports a natural magnetic layered structure combining both in-plane ferromagnetic super-exchange interactions mainly on the octahedron “8 f” sub-layer alternating and in-plane antiferromagnetic super-exchange interactions on the “8 h” sub-layer containing tetrahedral sites and five-fold symmetry polyhedra (i.e. squared based pyramid and/or trigonal bipyramid). Because of the interfacial magnetic interactions between the two types of layers, we report a detailed study of the intriguing magnetic properties. AC magnetic susceptibility shows a frequency dependent peak suggesting a cooperative character due to inter-cluster interactions resulting in a magnetic cluster glass state. When temperature decreases and/or applied magnetic field increase, the ferromagnetic clusters growth is promoted and results in a large vertical hysteretic shift on the Field Cooled magnetization isotherm in relation with minor loop.
      原文链接:
    • NSTL
    • Elsevier

    Dynamic mechanical properties and microstructure evolution of AlCoCrFeNi2.1 eutectic high-entropy alloy at different temperatures

    Song W.Song K.Hu M.
    17页
    查看更多>>摘要：The dynamic mechanical properties of the AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) fabricated by drop-casting (DC) and suction-assisted casting (SC) are investigated under different strain rates and temperatures using Split Hopkinson Pressure Bar (SHPB) system. Microstructure analysis is conducted through SEM, EBSD and TEM to reveal the deformation and fracture mechanisms of the present EHEA. The yield strength and flow stresses for both the DC alloy and SC alloy increase with increasing strain rate, but decrease with increasing temperature. A mixture of ductile and brittle fracture morphologies exists in both the DC and SC EHEAs. Moreover, the SC alloy displays more shear dimples on the fracture surface, while brittle fracture features become dominant for the DC alloy. Abundant accumulation of dislocations in the quasi-static test produces slip traces in the FCC lamellar phase which further enhances the plasticity of the SC alloy. Meanwhile, the dislocation cells formed by high-density dislocation tangles at high strain rates, leading to apparent work hardening and strain rate sensitivity of the SC alloy. The adiabatic shear band (ASB) forms in the SC alloy before shear failure and the adjacent twisted and curved lamellar structures play a significant role in preventing shear localization. Overall, the SC alloy exhibits a stronger strain rate effect and better ductility than the DC alloy.
      原文链接:
    • NSTL
    • Elsevier

    Simultaneous improvements of effective magnetic permeability, core losses and temperature characteristics of Fe-Si soft magnetic composites induced by annealing treatment

    Liu X.Wang J.Yang T.Xu J....
    9页
    查看更多>>摘要：In this paper, silicone-resin coating Fe-Si soft magnetic composites (SMCs) with high magnetic permeability, low core losses and good temperature/frequency stability were successfully fabricated. Microstructural characterizations suggest that the thin, continuous and heat-resistant silicone-resin coatings are constructed surrounding magnetic particles. The effective permeability of SMCs is significantly improved to 139.7 and 153.6 when the stress relief annealing temperatures increase to 700 °C and 800 °C, and meanwhile their core losses are obviously reduced to 657 mW/cm3 and 632 mW/cm3 (0.1 T/50 kHz), respectively. Loss-separation analyses confirm that hysteresis losses predominate in the total core losses within quite wide frequency ranges that depend on annealing temperatures, and higher temperature annealing can more effectively decrease hysteresis losses due to larger residual stress relaxation, which contributes to the simultaneous improvements of permeability and core losses. However, for the SMCs annealed at 800 °C, due to partially decomposed silicone-resin coatings, the strong eddy-current effects at high frequency region will cause sharply increased core losses and slightly decreased frequency stability of permeability. Noticeably, the temperature-dependent behaviors of core losses and permeability of Fe-Si SMCs can be also effectively tuned by optimizing annealing treatment.
      原文链接:
    • NSTL
    • Elsevier

    Multicolor and white light upconversion luminescence in α-NiMoO4:Yb3+/Ln3+ (Ln = Tm, Ho, Tm/Ho) nanoparticles

    Ray S.K.Hur J.Joshi B.Ramani S....
    13页
    查看更多>>摘要：In this study, α-NiMoO4:Yb3+ (15 mol%)/Ln3+ (Ln = Tm, Ho, Tm/Ho) phosphors with different doping concentrations of Tm3+ and Ho3+ (0.25, 0.50, 0.75, and 1.00 mol%) were successfully synthesized using a microwave hydrothermal method. Nanorods and attachment of nanoparticles (pebble and sphere) in nanorods were observed in host and doped samples, respectively. According to high-resolution transmittance electron microscopy (HRTEM) images, the interplanar spacings of the samples of 0.22 nm (040), 0.27 nm (?222), 0.35 nm (?112), and 0.61 (110) were well matched with the planes of X-ray diffraction (XRD) patterns. X-ray photoelectron spectroscopy (XPS) and TEM elemental mapping confirmed the incorporation of dopant ions and the uniform distribution of the elements in the samples. By changing the dopant species and concentration, multicolor (blue, green, and red) and white emissions could be achieved in the α-NiMoO4:Yb3+/Ln3+ (Ln = Tm, Ho, Tm/Ho) phosphors under 980 nm laser diode (LD) excitation. The generation of various colors and white light was further confirmed by the CIE color coordinates. The photon process and energy transfer mechanism from Yb3+ to Tm3+ and Ho3+ are also described. Finally, MTT (3-[4,5-dimethylthiazole-2-yl]?2,5-diphenyltetrazolium bromide) assay revealed the non-cytotoxic nature of the samples at low concentrations (below 0.125 mg/mL) in bovine skeletal muscle cells. These findings open the potential application of α-NiMoO4:Yb3+/Ln3+ (Ln = Tm, Ho, Tm/Ho) phosphors for multicolor bio-imaging, color displays, and white light sources.
      原文链接:
    • NSTL
    • Elsevier

    Effect of graphene oxide on properties of AZ91 magnesium alloys coating developed by micro-arc oxidation process

    Askarnia R.Sobhani M.Fardi S.R.Staji H....
    14页
    查看更多>>摘要：In this work micro-arc oxidation (MAO) process in the presence of an alkaline electrolyte with different amounts of graphene oxide (0, 10, 20 and 30 mg/L) has been applied on AZ91 magnesium alloys, successfully. Microstructure, phase evaluation, scratch test, corrosion behavior, bioactivity and antibacterial properties of fabricated ceramic coating were compared. The results reveal that in addition to the GO, composite coating contains MgO and Mg2SiO4 ceramics that were produced as a result of oxidation and electrolyte reaction with the Mg during MAO treatment. Addition of the GO into the electrolyte cause to reduction of the pores and cavities produced due to exhausting of the gas bubbles from the discharges channels in the MAO process. Coating with 20 mg/L of GO additive includes a uniform surface and the lowest pores in diameter in comparison with the other specimens that cause to clearly reduction of the corrosion current density to 0.24 A/m2. The damaged width of the scratch decreased from about 137 μm for non-added GO to 87 μm for sample 20GO due to strengthening of the ceramic coating by GO reinforcement. Hydroxyapatite phase has grown in a favorable composition over the coatings after soaking in the SBF solution, and the increasing of the GO addition cause to increasing of the antibacterial behavior of the ceramic coating against both of the S. aureus and E. coli bacteria.
      原文链接:
    • NSTL
    • Elsevier

    Low temperature study of phase equilibria in the Co–Ni–W ternary system: Evidence of a new intermetallic phase Co3W-D0a

    Bouliez N.Cury R.Andrieux J.Chiriac R....
    10页
    查看更多>>摘要：Tungsten heavy alloys (Co–Ni–W) of different compositions were prepared by powder metallurgy (solid sintering), heat treated at 800 °C and 1000 °C and subsequently analyzed. The experimental phase identifications and composition measurements emphasized discrepancies compared to the isothermal ternary sections simulated with commercial thermodynamic databases. The isothermal sections at 800 °C and 1000 °C were found more complex than expected since a new intermetallic phase appeared to be stable (D0a structure - Cu3Ti prototype). Likewise, an interpretation of phase equilibria evolution with temperature was established to reach agreement with high temperature data. Formation enthalpies associated with the new phase were obtained through first-principles calculations and supported experimental results as they confirmed the stabilizing role of Ni addition for the D0a structure.
      原文链接:
    • NSTL
    • Elsevier

    New layered quaternary BaCu6Sn2As4?x and BaCu6Sn2P4?x phases: Crystal growth and physical properties

    Wu H.Li S.Liu W.Ofenstein G.A....
    7页
    查看更多>>摘要：We report two new quaternary BaCu6Sn2As4?x and BaCu6Sn2P4?x phases with a new structure type, which are fully characterized by single crystal X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). These two phases crystallize in tetragonal cell with space group I4/mmm (#139) and Pearson symbol tI26. The refined lattice parameters are a = 4.164(1) ?, c = 24.088(3) ? for BaCu6Sn2As4?x, and a = 4.053(2) ?, c = 24.08(1) ? for BaCu6Sn2P4?x, respectively. They possess a distinct layered feature composed of Cu6Sn2Pnx (Pn = P, As) layers sandwiched by the Ba atoms. The Cu-Sn framework of the Cu6Sn2Pnx layer is closely related to the well-known Cu2Sb-type structure, and Pn atoms are found occupying two interstitial sites caused by close packing of Cu and Sn atoms or capped on the top of square nets formed by Cu atoms. The compounds are also characterized by electrical transport measurements down to 2 K.
      原文链接:
    • NSTL
    • Elsevier

    Crystallographic anisotropy of the superelastic and mechanical properties of the Ti–20Zr–3Mo–3Sn alloy evidenced by nanoindentation at the grain scale

    Fillon A.Laille D.Gloriant T.Zhou Y....
    8页
    查看更多>>摘要：Nanoindentation was combined with electron backscatter diffraction (EBSD) to investigate the crystallographic anisotropy of indentation responses of individual grains in the superelastic Ti2033 alloy. The high statistic of measurements from grains oriented over a large range of crystallographic directions facilitated a fundamental study covering the entire stereographic triangle of the β phase. For a highlighted visual effect, results were presented as inverse pole figure distribution maps of depth recovery, work recovery, indentation modulus and hardness. Results showed that the pronounced anisotropy behaviors of indentation modulus, depth and work recovery ratios resulted from the anisotropy in Young's modulus and in compressive lattice distortion between the bcc structure of β phase and the orthorhombic structure of the stress-induced α’’ martensite phase, respectively. However, orientation dependence was gone when plasticity occurred. The orientation-independency in indentation hardness was due to the various slip systems that might be activated within bcc crystals.
      原文链接:
    • NSTL
    • Elsevier