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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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    X-ray diffraction reinvestigation of the Ni-Pt phase diagram

    Popov A.A.Varygin A.D.Plyusnin P.E.Korenev S.V....
    10页
    查看更多>>摘要：The Ni-Pt phase diagram was corrected in the range of 15–85 at.% Pt and in the temperature range of 400–525 °C using powder X-ray diffraction data. To reduce the time required to achieve the equilibrium state, Ni-Pt alloys, consisting of 80–140 nm nanocrystalline particles (nanoalloys) were used as initial samples. The nanoalloys were synthesized by thermolysis of specially prepared multicomponent precursors. Phase transformations in the system at high temperatures were studied in situ by X-ray diffraction. The boundary positions of Ni1?xPtx (A1), Ni3Pt (L12), NiPt (L10), NiPt3 (L12) single-phase regions were corrected.
      原文链接:
    • NSTL
    • Elsevier

    Magneto-electric [CCI/CTO]@PANI composites: Structural, magnetic, morphological, and microwave absorption performance in 2–18 GHz frequency range

    Su Y.Li Z.Sun S.Mohammed J....
    10页
    查看更多>>摘要：In this research, we reported a novel low-cost and efficient composite consisting of corroded carbonyl iron (CCI), calcium copper titanate (CTO) and polyaniline (PANI). The XRD analysis shows that the CTO sample exhibits a pure crystalline phase with an orthorhombic structure, while the amorphous peak of PANI appears at 25.4°, corresponding to the (200) crystal plane. Morphological investigations have shown that the pitching corrosion has successfully altered the smooth surface of the carbonyl iron and that the CTO sample exhibits a near cubic shape. The formation of a continuous network of the [CCI/CTO]@PANI composite is also evident in the FESEM images. The electromagnetic (EM) wave absorption capability of the [CCI/CTO]@PANI composite was investigated at the 2–18 GHz range. The [CCI/CTO]@PANI composite sample with 30 wt% and thickness of 2 mm exhibits reflection loss (RL) of ?22.0 dB at 14 GHz with a bandwidth of 6.5 GHz covering the range 11.5?18.0 dB which is more than the entire bandwidth of the Ku band.
      原文链接:
    • NSTL
    • Elsevier

    Review of vanadium-based layered compounds

    Reisinger G.R.Richter K.W.
    19页
    查看更多>>摘要：In this systematised review, we present a bibliographic analysis of the literature available on vanadium-based layered compounds. The keywords are not entirely standardised for all publications and topics covered. Numerous different synthesis approaches are presented in literature. The most common approaches involve mineralisers and annealing conditions above 800 °C for several days or weeks in the case of misfit layer compounds and below 60 min and below 650 °C for ferecrystals. We standardise all available structural data regarding the -lattice parameters (including sub/superlattices), misfit parameters and stacking, and compare them to each other. Furthermore, we show research possibilities for further investigations in this field of study (e.g. templated growth mechanism, phase equilibria, twelvefold symmetry).
      原文链接:
    • NSTL
    • Elsevier

    Modeling and evaluation of sintered microstructure and its properties for rSOFC fuel electrodes by coarse-grained molecular dynamics

    Miao H.Yang X.Yuan J.Wu Y....
    13页
    查看更多>>摘要：Degradation is one of the major issues affecting rSOFC (reversible solid oxide fuel cell) performance in both fuel cell and electrolysis mode operation. Defect and even damage appeared on electrode microstructure may be associated with thermal stress and strain distribution appearing in the electrode sintering process. It is necessary to investigate interactions and sintering process between material particles/clusters. A bottom-up modeling approach employing CG-MD (coarse-graining molecular dynamics) method is developed to model the sintering process for the material particles in rSOFC fuel electrodes. Based on the reconstructed porous electrode, various microstructural and thermal-mechanical properties are further evaluated for, e.g., porosity, triple-phase boundary length, and stress distribution. The effects of the material composition, sintered temperature, pressure and nanoparticle size are also investigated and discussed.
      原文链接:
    • NSTL
    • Elsevier

    The synthesis of lead-free double perovskite Cs2Ag0.4Na0.6InCl6 phosphor with improved optical properties via ion doping

    Peng K.Yu L.Min X.Hu M....
    9页
    查看更多>>摘要：Lead-free double perovskite (DP) phosphors with nontoxicity and excellent moisture, light, and heat stability are promising alternatives to lead halide perovskites for wide uses in optoelectronic applications. As known, their photoluminescence (PL) quantum yield (PLQY) is low in normal. Here, the optical properties of orange-emitting Cs2Ag0.4Na0.6InCl6 DP via doping Bi3+, Sm3+, or Mn2+ ions in the host lattices are proposed and remarkably enhanced. For the Bi3+-doping, the optical band gap of the Cs2Ag0.4Na0.6In1?xBixCl6 DP could be tuned from 3.82 to 2.74 eV and the optimized sample shows a markedly high PLQY of 97.33%. Sm3+-doped Cs2Ag0.4Na0.6InCl6 microcrystals (MCs) are endowed with broad emission derived from self-trapped excitons (STEs) of host. The orange-red emissions at 570, 608, and 655 nm from the transitions of 4G5/2 to 6HJ (J = 5/2, 7/2, and 9/2) of Sm3+, are demonstrated the first observation of PL from the Sm3+-doped lead-free halide DP. The Mn2+-doped Cs2Ag0.4Na0.6InCl6 MCs show dual emission peaks centered at 538 nm and 618 nm, owing to the STEs emission of Cs2Ag0.4Na0.6InCl6 host and 4T1 → 6A1 transition of Mn2+, respectively. It is interesting that the PLQY of Cs2Ag0.4Na0.6InCl6 MCs is dramatically enhanced from 21% to 41% via doping Mn2+.
      原文链接:
    • NSTL
    • Elsevier

    Elastic and structural properties of Mg25Al75 binary metallic glass under different cooling conditions

    Samiri A.Khmich A.Hassani A.Hasnaoui A....
    14页
    查看更多>>摘要：Molecular dynamics (MD) simulations based on the embedded atomic method (EAM) are used to study the annealing effect on elastic and structural behavior for different cooling rates of binary Mg25Al75metallic glasses (MGs). Firstly, we examine the cooling rates effect (5×1011K/s, 1012K/s, 5×1012K/s and 1013K/s) on the atomic locale structure of Mg25Al75MG through a variety of local structure analysis methods such as bond angle distribution (BAD), total and partial radial distribution function (RDF), Voronoi tessellation analyses (VTA) and coordination numbers (CNs). Our results confirm that the Mg25Al75 glass formation is proved by a splitting of the second peak in the RDF upon quenching process. The<0,0,12,0>,<0,1,10,2> and<0,2,8,4> Voronoi polyhedrons (VPs) have been depicted as the most dominant polyhedrons in the system, and we have found that the <0,0,12,0>,<0,1,10,2> clusters increase while the <0,2,8,4> cluster decreases as a function of the decrease of the cooling rate. Via the Went-Abraham parameter, our numerical results show an increase of the glass transition temperature (Tg) with increasing of cooling rate. Finally, we heat-treated the binary Mg25Al75MG samples at the aging temperature 450 K during period varying from 0 to 5 ns for four different quenching rates. We observed that the elastic constants C11and C44 increase while C12decreases as the annealing time increases and the quenching rate decreases. This has been correlated with the elastic moduli, where Young's modulus (E), bulk modulus (B) and shear modulus (G) increase, which suggests the improvement of the elastic behavior, the resistance to compression and the resistance to the shear bands (SBs), respectively. We also found that at the atomic level in the short-range order (SRO), the <0,0,12,0>and<0,1,10,2> clusters and the degree of the five-fold symmetry increase as a function of the increase of annealing time.
      原文链接:
    • NSTL
    • Elsevier

    Stress-induced formation of μ-TCP phase during the early-stage interdiffusion process in the NiCrAlY/NiAlCoCrW model coating/superalloy system at ambient temperature

    Zhang Y.Zhang L.Deng C.Li Q....
    9页
    查看更多>>摘要：In this paper, two model NiCrAlY/NiAlCoCrW coating/superalloy diffusion couples, cp0 and cp15, were prepared and subjected to annealing at 1173 K for 40 h under no stress and a uniaxial compressive stress of 15 MPa, respectively. No noticeable microstructural evolution occurred in cp0, while apparent interdiffusion zones and especially a number of TCP phases developed across the interface in cp15. The TCP precipitates, majorly consisting of Ni, Cr, Co and W, were identified as μ phase. Moreover, μ-TCP phase precipitated as small granular particles along the interface perpendicular to the loading axis, while as large needle-like ones on both coating and superalloy sides parallel to the loading direction. The formation of μ-TCP phase with complex morphologies at such early stage of interdiffusion process due to the coupled effect of compressive stress and ambient temperature may seriously reduce the creep lifetime of the coating/superalloy system.
      原文链接:
    • NSTL
    • Elsevier

    Low-temperature superplasticity of ultrafine-grained near β titanium alloy

    Ratochka I.V.Naydenkin E.V.Mishin I.P.Lykova O.N....
    9页
    查看更多>>摘要：Studies of the low-temperature superplasticity (SP) of ultrafine-grained (UFG) near β alloy Ti-5Al-5V-5Mo-1Cr-1Fe at a temperature of 823 K (～0.42 Tm) in the range of strain rates (2.0–6.9)·10?3 s?1 have been carried out. It is shown that for an UFG alloy with an average grain size of d ～ 0.17 μm, obtained by the method of multi-axial pressing, the value of the relative elongation to failure exceeds 950% at a strain rate of 2·10?3 s?1. Annealing of the UFG alloy at a temperature of 873 K for 1 h does not cause a noticeable increase in the average grain size (d ～ 0.23 μm), but leads to the transition of a part of grain boundaries to a more equilibrium state and a decrease in elongation to failure by more than 3 times in the range of strain rates. The study of the evolution of the microstructure under tension at a rate of 2·10?3 s?1 showed that in both states of the alloy up to an elongation of 150%, the average size of the elements of the grain-subgrain structure practically does not change, which is due, among other things, to the appearance of new grains less than 100 nm in size during the SP deformation. It is shown that the significantly lower elongation to failure of the UFG Ti-5Al-5V-5Mo-1Cr-1Fe alloy subjected to annealing may be due to the hindered accommodation of grain boundary sliding during the SP deformation by intragranular dislocation slip because of the transition of individual grain boundaries to an equilibrium state. The preservation of the UFG structure of the alloy with high strength characteristics under conditions of low-temperature superplasticity creates good prerequisites for obtaining high-strength products of complex shape in the regime of SP forming.
      原文链接:
    • NSTL
    • Elsevier

    First-principles study of the alloying effects on the structural stability and mechanical properties of L12-Pt3Hf

    Yao X.Guo Y.-F.Mao Y.
    9页
    查看更多>>摘要：L12-structure Pt3Hf alloy has potential application in the high temperature field due to its higher melting point and superior strength. As a candidate strengthening phase for designing Pt-based superalloys, the improvement of stability and mechanical properties of L12-Pt3Hf is crucial for its application. In this work, the alloying effect on the elastic properties, stacking fault energy, yield behavior and ductility of L12-Pt3Hf are investigated by using the first-principles methods. The results indicate that the dislocation dissociation bounding with a superlattice intrinsic stacking fault (SISF) is energetically favored, thus the yield stress anomaly (YSA) is absence in L12-Pt3Hf. V, Mo and W may change the deformation mode of L12-Pt3Hf, and they have a positive effect on improving the ductility. The analysis of electronic structure reveals that adding alloying elements close to or belonging to half-filled d-orbital is beneficial to improve the ductility of L12-Pt3Hf.
      原文链接:
    • NSTL
    • Elsevier

    Wearable biomolecule smart sensor based on Au@PB NPs with high electrochemical activity

    Zhang W.Meng F.Qin Y.Zhang M....
    8页
    查看更多>>摘要：Wearable biosensors have aroused great interest because of their potential to provide continuous and real-time physiological information through dynamic and fast response to biochemical markers in biological fluids. When the wearable sensor is used for fluid detection, required to sensors own high sensitivity and low detection limit since the complex substrate and trace amount of target. Therefore, prepared high response nanomaterials play a crucial for fabrication of wearable sensors. In our work, Prussian blue nanomaterials with core-shell structure was successfully synthesized via using Au NPs as catalyst, as prepared core-shell structural Au@PB NPs exhibited high electrochemical activity, wonderful water solubility and high stability. Then combined with screen printing technology to construct highly stable flexible sensors for the detection of biomarkers with sensitivities 301.5 μA·mM?1·cm?2 and 29.3 μA·mM?1·cm?2 respectively. Furthermore, combined with microfluidic technology, it is expected to be used in health management monitoring and clinical application on a large scale.
      原文链接:
    • NSTL
    • Elsevier