首页期刊导航|Journal of Alloys and Compounds
期刊信息/Journal information
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
正式出版
收录年代

    Development of Ti-Mo-Fe alloys combining different plastic deformation mechanisms for improved strength-ductility trade-off and high work hardening rate

    Barucca G.Giguere N.Brodusch N.Gauvin R....
    16页
    查看更多>>摘要：? 2022 Elsevier B.V.Titanium-based biomaterials are the gold standard for orthopedic implants; however, they are not generally suitable for the manufacture of intravascular stents. Their low strength-ductility trade-off and low work hardening rate are their main limitations. However, Ni-free alloys are desirable for such application in order to avoid allergic reactions caused by the high Ni-content materials currently applied. Therefore, in this study, three alloys of the Ti-Mo-Fe system (Ti-8Mo-2Fe, Ti-9Mo-1Fe and Ti-10.5Mo-1Fe) were designed to present high strength-ductility compromise and high work hardening rate. Their microstructures, mechanical properties and plastic deformation mechanism were investigated. Athermal ω precipitates were observed in the β matrix of all solution-treated alloys. In the solution-treated β matrix of the Ti-9Mo-1Fe alloy, additional nanometer-sized α" particles were detected by transmission electron microscopy (TEM). Although the combined TWIP/TRIP effects were expected by the design method on the Ti-8Mo-2Fe and Ti-9Mo-1Fe alloys, no TRIP effect was actually observed. In fact, stress-induced martensitic (SIM) transformation occurred mainly at the {332}<113> twins/matrix interfaces for all the strained microstructures and acted as a localized stress-relaxation mechanism, delaying the fracture. Based on the electron backscatter diffraction (EBSD) analyses, in the Ti-8Mo-2Fe and Ti-10.5Mo-1Fe alloys, the formation of a dense network of {332}<113> twins was responsible for their high and steady work hardening rates (1370 and 1120 MPa) and large uniform elongations (22% and 34%). The absence of SIM α" as the primary mechanism of plastic deformation and solid solution hardening of Fe resulted in their high strengths (yield strength of 772 and 523 MPa). In Ti-9Mo-1Fe, the formation of mechanical twinning was hindered, resulting in limited strain-hardening capability and low uniform elongation (6%). The nanometer-sized α" particles in its β matrix along with the athermal ω precipitates are thought to impair the mechanical twinning and the ductility of this alloy.
      原文链接:
    • NSTL
    • Elsevier

    Successive ionic layer adsorption and reaction processed CuSCN for efficient inverted perovskite solar cells

    Wei J.Guo X.Yang H.Liu A....
    7页
    查看更多>>摘要：? 2022 Elsevier B.V.Copper thiocyanate (CuSCN) is a promising inorganic hole transport material for perovskite solar cells (PSCs) due to its wide-bandgap, low cost, high carrier mobility and good transmittance. However, there are limited reports about CuSCN application in PSCs mainly due to its inferior solubility. Here, we prepared high-quality CuSCN films through a simple solution method named successive ionic layer adsorption and reaction (SILAR). Using SILAR method, high-quality CuSCN films could be obtained on ITO (indium tin oxide) substrate with good morphology and photoelectric properties. As a result, efficient inverted PSCs were fabricated with SILAR-prepared CuSCN and the efficiency can be increased from 11.10 % to 18.71 %.
      原文链接:
    • NSTL
    • Elsevier

    Extraordinary upconversion enhancement in hybrid metasurface by simultaneous excitation/emission band match

    Su X.Bao Q.Zhan S.Liu Y....
    8页
    查看更多>>摘要：? 2022Lanthanide doped upconversion nanoparticles (UCNPs) suffers a significant challenge of low quantum efficiency, which seriously limited their applications in photovoltaic device and bioimaging. In this work, we proposed a plasmonic pattern/UCNPs/metal film hybrid metasurface with ultrahigh upconversion enhancement factor. The plasmonic absorption bands can be precisely controlled to simultaneously match both the excitation and the emission wavelength of UCNPs. By constructing the efficient coupling between the local field and the UCNPs, the upconversion fluorescence can be enhanced by 4–6 orders of magnitude. It's worth noting that such strategy almost covered the two major types of lanthanide doped UCNPs, which were sensitized by Yb3+ (excited under 980 nm) and Nd3+ (excited under 808 nm). The emission enhancement factor was found to be sensitive to the structural parameters and refractive index of the surroundings. Based on this effect, an upconversion intensity and spectra shift dual-mode sensing to environment refractive index can also be achieved. The proposed hybrid metasurface provided an effective way to achieve highly efficient upconversion emission, and the results can also be helpful in solar cells and biological detection.
      原文链接:
    • NSTL
    • Elsevier

    Construction of an all-solid-state Z-scheme Ag@Ag3PO4/TiO2-(F2) heterostructure with enhanced photocatalytic activity, photocorrosion resistance and mechanism insight

    Niu M.Liu Y.Kong X.Zhang M....
    16页
    查看更多>>摘要：? 2022 Elsevier B.V.Photocatalysis is still a promising technology to alleviate the antibiotic residual problem of wastewater in the ecological environment. Herein, an all-solid-state Z-scheme Ag@Ag3PO4/TiO2-(F2) (TFAP) heterojunction photocatalyst was constructed using the hydrothermal method for the first time. The photocatalytic performance of TFAP nanocomposites for tetracycline hydrochloride (TCH) degradation was evaluated under simulated sunlight. The prepared materials were characterized by XRD, FE-SEM, TEM, BET, FT-IR, UV[sbnd]vis DRS, XPS, PL, and ESR measurements. The TFAP nanocomposites showed high degradation efficiency and excellent repeatability to TCH destruction. Among them, the (TFAP 1–1) nanocomposite has a lower bandgap energy (1.80 eV), a larger specific surface area (53.48 m2/g), and a lower electron-hole recombination rate. After 2.5 h of simulated sunlight irradiation, the degradation rate of the 200 mg/L (TFAP 1–1) nanocomposite (k = 0.0154 min?1) to 10 mg/L TCH reached 94.14%, which was much higher than that of the pure TiO2, TiOF2, and Ag3PO4 samples. The experimental results demonstrated that TiO2 was generated as an intermediate product during the chemical reaction process between Ag3PO4 and TiOF2. Additionally, Ag nanoparticles were formed in the Ag3PO4/TiO2/TiOF2 heterojunction system. An electric field was formed between Ag3PO4 and Ag, enhancing the visible light absorption ability. Because of the Schottky potential difference, the electrons accumulate in Ag nanoparticles, thus enhancing the photocorrosion resistance of Ag3PO4. Additionally, the localized surface plasmon resonance (LSPR) effect of Ag nanoparticles greatly promoted the separation of carriers at the interface of the heterojunction. The LSPR effect leads to the co-oscillation of free electrons, which leads to the strong absorption of electromagnetic energy and enhances the photocatalytic performance of the heterojunction. The Ag@Ag3PO4 nanocomposites acted as electron transport media for an all-solid-state Z-scheme TFAP heterojunction system. This study provides some in-depth insights into the structural design of Z-scheme heterojunctions, which have certain implications for other catalytic systems.
      原文链接:
    • NSTL
    • Elsevier

    Porous hybrid carbon nanofibers derived from metal-organic frameworks for high-performance supercapacitors

    Li Y.Wei Z.Chen X.Li S....
    8页
    查看更多>>摘要：? 2022 Elsevier B.V.In view of the current problem that MOFs (Metal-organic frameworks)-based carbon as electrode materials for supercapacitors have poor conductivity and single component. We design porous hybrid carbon nanofibers (C-ZIF-67 @PAN@ZIF-8) derived from 1D core-shell MOFs. They can combine the advantages of 1D carbon materials (high conductivity) with hybrid carbon materials (multiple components) showing excellent electrochemical performance. The specific capacitance can reach 320.8 F g?1 at a current density of 1 A g?1, which is higher than C-ZIF-8 (180.8 F g?1) and C-ZIF-8 @PAN (273.7 F g?1) in a three-electrode system. In addition, symmetrical supercapacitors are assembled with C-ZIF-67 @PAN@ZIF-8, which can provide very stable performance and almost no capacitance decay after 10,000 cycles at a current density of 5 A g?1. The supercapacitors also can offer a high energy density of 8.0 wh kg?1 at a power density of 250 w kg?1.
      原文链接:
    • NSTL

    Microstructure and mechanical properties of AlNbTiVZr system refractory high entropy alloys

    Jiang W.Jiang B.Wang Y.Wang X....
    8页
    查看更多>>摘要：? 2022 Elsevier B.V.To obtain refractory high entropy alloys (REHAs) with reasonable microstructure and excellent properties, the effects of Zr on the microstructure and mechanical properties of Al0.5NbTiV2Zrx and Al0.5Nb0.5TiV2Zrx (x = 0.5, 1.0, 1.5) RHEAs were investigated. The results show that Al0.5NbTiV2Zrx and Al0.5Nb0.5TiV2Zrx alloys have obvious identical changes with the change of Zr content. BCC structure is matrix phase, and the second phase is Laves phase. With the increase of Zr content, the BCC matrix phase decreases and the volume fraction of the Laves phase increases. Meanwhile, at room temperature, the compressive properties decrease with the increase of the volume fraction of the second phase. When the compression test temperature increases to 1073 K, the strength of the alloy decreases and its deformability increases. The yield strength of Al0.5NbTiV2Zr0.5 and Al0.5Nb0.5TiV2Zr0.5 alloys decreased to 635 MPa and 656 MPa respectively, and the compressive strain still exceeded 50 %. The ductile brittle transition temperature appears between 873 K and 1073 K, which is induced by the dislocation movement of the matrix. The mechanical properties of Al0.5Nb0.5TiV2Zr0.5 alloy at room temperature and high temperature exhibits the best mechanical properties.
      原文链接:
    • NSTL
    • Elsevier

    Exploration of correlation between the material characteristics of the copper layer on the electrical and thermal properties of REBCO tape and coil

    Zhang H.Suo H.Ma L.Zhang Z....
    17页
    查看更多>>摘要：? 2022 Elsevier B.V.To achieve the approriate trade-off between the low charing delay and enough self-protection ability in the NI REBCO coil, the controllable Cu layer structure in REBCO tape is essential, which can cause required electrical and thermal properties in both the radial and circumferential direction. In this paper, the correlation between the material characteristics of the copper layer on the electrical and thermal properties of REBCO was explored by investigating the REBCO tape with different Cu layer thicknesses. The influence of charging decay, self-protection, and cold shrinkage stress on the REBCO coil performance was also evaluated based on three tapes. Three new findings showed the possible dominant factor on electrical and thermal properties in either radial or circumferential direction. Unlike the traditional electroplated layer, the Cu layer in the SP3 sample has piecemeal Cu grains, which may be the primary factor in significantly increasing the electrical resistivity and decreasing the thermal conductivity significantly. In the radial direction, the nonuniform top, bottom, and even side thickness of the Cu layer could increase the electrical resistivity and thermal conductivity. And the bad corner contact quality between the Cu and Ag/REBCO could be an important factor. Furthermore, the Cu layer purity may be significantly lower than previously thought. Using the electrical resistivity and thermal conductivity values of pure Cu as the Cu layer in the simulation could result in significant errors. This study provides possible directions for finding a method to control the properties of the Cu layer of REBCO commercial tape, which can better fit different application scenarios.
      原文链接:
    • NSTL
    • Elsevier

    Structural and optical properties of Nd doped LaPO4

    Jangir R.Srihari V.Singh R.Deshpande U....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.In this study, effect of Nd doping, as a dopant material on the structural, optical and electronic properties of lanthanum monazite structure has been studied. Pure and Nd:LaPO4 powders with varying Nd concentrations were prepared via conventional high-temperature solid-state reaction method. Compositional information obtained using Energy dispersive X-ray spectroscopy showed that within the detection limit, no impurities were present in the samples. Oxidation states of the elements were confirmed from X-ray photoelectron spectroscopy (La and Nd) and X-ray absorption near edge structure studies (La). X-ray diffraction showed the formation of monoclinic crystal structure without any phase impurity. Fourier transform infra-red spectroscopic measurements confirmed the substitution of Nd in LaPO4 matrix. We also report the first ever local structure analysis using Extended X-ray absorption fine structure which showed that the Nd atoms have successfully substituted La atoms in LaPO4 matrix. The bandgaps were obtained from Diffuse reflectance UV-Visible spectroscopy.
      原文链接:
    • NSTL
    • Elsevier

    High-performance BF-BT-based lead-free piezoceramics with local polar nanoregions of room-temperature ergodic state

    Fan G.Zeng F.Guo H.Wang F....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.The present work highlights the successful fabrication of the (1-x)(BF-BHT)-xLST lead-free piezoelectric ceramics by the conventional solid-state method. The composition (x = 0.03) was found with a high Curie temperature of Tc ~ 435 °C and a superior electric field-induced strain as high as 0.42 %. The piezoelectric force microscopy (PFM) and transmission electron microscopy (TEM) measurement revealed the existence of polar nano-regions (PNRs) due to the local compositional heterogeneity which is attributed to the introduced relaxor (La0.1Sr0.8)TiO3-δ. Moreover, the superior temperature stability of piezoelectric strain S*% with the maximum 31 % was obtained in the temperature range of 25–245 °C, indicating that the recipe possesses outstanding high-temperature reliability. The findings in this work provide a novel design philosophy to prepare high-performance BF-BT-based lead-free piezoceramics.
      原文链接:
    • NSTL
    • Elsevier

    High energy storage density and temperature stable dielectric properties of (1-x)Bi0.5(Na0.82K0.18)0.5Ti0.99(Y0.5Nb0.5)0.01O3-xNaNbO3 ceramics

    Yang F.Li Q.Zhang A.Jia Y....
    9页
    查看更多>>摘要：? 2022 Elsevier B.V.The development of lead-free ceramics with high energy storage density is critical due to the human health and environmental hazards of lead and the demand to miniaturize and integrate electronic devices. Nevertheless, the high applied electric field limits their use in integrated circuits. In this work, (1-x) Bi0.5(Na0.82K0.18)0.5Ti0.99(Y0.5Nb0.5)0.01O3-xNaNbO3 (BNKTYN-100xNN) ceramics were prepared, and excellent energy storage properties were obtained. It has revealed that NaNbO3 dopant reduces remanent polarization and increases relaxor degree. BNKTYN-9NN ceramics has high energy storage density (Wrec =1.6 J/cm3) and responsivity (ξ = Wrec/E = 145.5 J/(kV?m2)) under 110 kV/cm. Meanwhile, good temperature stability (20–120 °C) and fatigue resistance (105 cycles) were also obtained in BNKTYN-9NN ceramics. In addition, doping NaNbO3 suppresses the dielectric anomaly peak, and BNKTYN-9NN ceramics has excellent temperature-stable dielectric permittivity from 53° to 447°C. These results suggest that BNKTYN-100xNN ceramics are promising for energy storage equipment.
      原文链接:
    • NSTL
    • Elsevier