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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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    (162931)Decorating tungsten oxide on g-C_3N_4 nanosheet as Z-scheme heterogeneous photocatalyst for efficient hydrogen evolution

    Haibing CheLiyang XiaoWenyuan Zhou
    8页
    查看更多>>摘要:Here a facile hydrothermal method was developed to prepare heterogeneous photocatalyst constructed by decorating nanorod-assembled orbicular WO_3-0.5 H_2O on the surface of porous carbon nitride nanosheets. By integrating two martials with synergetic effect according to their bandgap structure, as-obtained catalyst exhibits well-suppressed recombination of the photoexcited carriers by formation of Z-scheme bandgap structure. It, together with the increased surface areas, contributes to the significantly improved photo-catalytic performance. As a result, the heterogeneous photocatalyst reveals a hydrogen generation rate of 3100 umol-g~(-1)-h~(-1) under visible light irradiation, accounting for an approximately 16 times higher than that of pristine graphite carbon nitride. Accordingly, as proposed strategy provides a new opportunity to explore advanced catalysts with superior properties for renewable energy utilization.

    (162711)Interdiffusion behaviors between NiCrFe alloy and low-/medium-/high-entropy alloys

    Juan ChenJinkun XiaoLijun Zhang
    10页
    查看更多>>摘要:Six groups of fcc solid/solid diffusion couples, including Ni-Cr-Fe/ low-entropy (pure Ni, and NiCo, NiCr, and NiCoCr) alloys, Ni-Cr-Fe/ medium-entropy (CoCrNi) alloys, and Ni-Cr-Fe/ high-entropy (CoCrFeNi) alloys, were prepared, and their composition profiles were experimentally measured. Concentration-dependent interdiffusion and tracer diffusion coefficients in fcc Ni-Co-Cr-Fe system at 1473 K were retrieved with the aid of High-throughput Determination of Interdiffusion Coefficients (HitDIC) software and their reliability was validated. In most cases, D_(CrCr)~(Ni)> D_(FeFe)~(Ni)> D_(CoCo)~(Ni). The comprehensive comparison between the inter-diffusivities/tracer diffusivities in the NiCo, NiCr, NiCoCr low-entropy, CoCrNi medium-entropy, and CoCrFeNi high-entropy alloys and those reported data available in the literatures indicates that the inter-diffusivities Co, Cr, and Fe in low-entropy alloys are the largest than those in the other two types of alloys. While the tracer diffusivity in Co-Cr-Fe-Ni HEAs may have no sluggish phenomenon when the absolute temperature is used.

    (163077)Fabrication and properties of symmetrical W/Si_3N_4/W functionally graded materials by spark plasma sintering

    Zhilei WeiSiyu LiuDangui Liu
    10页
    查看更多>>摘要:Si_3N-4 ceramics have shown promising application prospects as the sealing materials for liquid metal batteries (LMBs). However, the joining of Si_3N-4 to the metal shell of LMBs is rather difficult because of the non-wetting property and mismatch of their thermal expansion coefficients (CTEs). Herein, to solve the above issue, W/Si_3N-4 functionally graded materials (FGMs) were designed and fabricated via the spark plasma sintering (SPS) process. The effects of layer numbers and layer components on the phase composition, structure, and thermal stress of the FGMs were systematically investigated using both experimental and simulation methods. W/Si_3N-4 FGMs, with optimal layer numbers, were then utilized for fabricating symmetrical W/Si_3N-4/W FGMs. The thermal stress of the products can be effectively reduced by adjusting the MgO content of the central Si_3N-4 layer. As a result, the optimal product displayed good interface bonding between two adjacent layers and also exhibited high flexural strength (943.9 MPa) and electrical resistivity (2.0 × 10~(12) Ω cm). This route for the fabrication of symmetrical W/Si_3N-4/W FGMs exhibits the advantage of high efficiency, and the products with excellent properties can be used as sealing materials for LMBs.

    (163032)Auto-combustion synthesis of Sr_2Fe_2O_5/Dy_3Fe_5O_(12) nanocomposite using Hordeum vulgare L extract: Preparation, structural analysis and evaluation of its photocatalytic and electrochemical behaviors

    Mahin BaladiQahtan A. YousifMovlud Valian
    12页
    查看更多>>摘要:Due to the increase in pollution, and incredibly polluted water resources, access to safe water has become one of the major human activities in the present age. Also, existing organic compounds from industrial wastewater in water sources are a concern for human health. So in this work, Sr_2Fe_2O_5/Dy_3Fe_5O_(12) (SFO/DFO) nanocomposite were fabricated via a green auto-combustion sol-gel method using Hordeum vulgare L extract as a natural fuel. Proper control over the dimensions and morphology of nanocomposite was achieved by changing the parameters consisting of fuel types (natural and chemical) and calcination temperature. The results showed that every parameter affects the particle size and morphology of products, and by controlling these factors, the optimum sample can be obtained. The photocatalytic ability of SFO/ DFO nanocomposite was performed for the destruction of organic dyes. This nanocomposite was used to investigate the photocatalytic properties under UV light in the aqueous solution of methylene blue (MB), Erythrosine, and acid red dyes. The results of the photocatalytic process showed 82% discoloration for the methylene blue (MB). Three compounds, including Ethylenediaminetetraacetic acid, 1,4-Benzoquinone, and Benzoic acid, were used as scavengers to investigate the mechanism of the photocatalytic process. The results showed that the mechanism of the photocatalytic process proceeds through hydroxide radicals, which Benzoic acid scavenges. The electrochemical redox behavior of MB on SFO/DFO/CPE (carbon-paste electrode) was studied using cyclic voltammetry (CV). Besides, according to the VSM result, SFO/DFO nanocomposite is ferromagnetic.

    (162977)Microstructure changes and mechanical properties of U-2Nb alloy induced by shot peening treatment

    Fangfang LiYawen ZhaoXianglin Chen
    9页
    查看更多>>摘要:The microstructure changes and mechanical properties of dual-phase U-2 Nb alloy subjected to shot peening treatment (SPT) were investigated. SPT induced severe plastic deformation in the U-2 Nb alloy surface, and a gradient nanostructure was formed on the surface with the grain size ranging from nanocrystallization structure to coarse grains from the surface to the matrix. The results showed that both the α phase with an orthorhombic crystal structure and the y phase with a body-centered cubic structure in the surface layer of the U-2 Nb alloy were refined to nanocrystals with an average nanocrystallization structure size of 63 nm. Due to the concentration of stress at the α/γ interface and grain size effect, the refinement of the α phase matrix occurred before y phase. Furthermore, dislocation slipping caused by deformation, rather than deformation twinning, played a key role in the grain refinement of U-2 Nb alloy. Microhardness and tensile tests showed that both surface microhardness and tensile strength were improved after SPT.

    (162902)Elastic and plastic anisotropy in a refractory high entropy alloy utilizing combinatorial instrumented indentation and electron backscatter diffraction

    Abheepsit RaturiKrishanu BiswasN.P. Gurao
    13页
    查看更多>>摘要:A comprehensive study was carried out to predict the elastic and plastic anisotropy of the non-equiatomic Mo_(15)Nb_(35)Ta_(35)V_5W_(10) Refractory High Entropy alloy (RHEA) using a high throughput combinatorial approach employing instrumented micro-indentation with electron backscatter diffraction (EBSD). The Levenberg-Marquardt optimization algorithm was utilized to determine elastic stiffness constant (C_(11) =267, Q2 = 115 and C44 = 52 ) for accessing elastic anisotropy. The anisotropy in plastic deformation of <001>, <011> and <111> orientated grains can be attributed to the activation of the different {112} < 111> slip system along with cross slip and the conservative movement of jogs on the screw dislocation. The spatial distribution of misorientation on <001>, <011> and <111> orientated grains as well as slip plane trace analysis, indicates that symmetry in misorientation pattern results from the flow of material along < 111 > slip direction on the indented surface. The results of the present investigation clearly indicate that the anisotropy in the elastoplastic behavior of novel RHEA is distinct from its constituent elements and that simple rule of mixtures is not sufficient to determine elastic modulus and lattice friction stress of RHEAs. Thus, high throughput experimental techniques are necessary to establish the structure-property linkages in novel multicomponent multi-principal RHEA compositions.

    (163022)Enhanced performance of solution-processed all-inorganic halide perovskite photodetectors by using bulk heterojunction and lateral configuration

    Peiyun TangShengyi YangJinming Hu
    8页
    查看更多>>摘要:Currently, ail-inorganic halide perovskites are widely investigated for their applications in optoelectronics due to their excellent physical and chemical properties. In this paper, solution-processed bulk-hetero-junction lateral photodetectors Ag/CsPbBr_3:ZnO/Ag were built to enhance device performance, in which the active CsPbBr_3 layer were surface-passivated by ZnO nanoparticles (NPs) in an optimized molar ratio. By optimizing the molar ratio of CsPbBr_3 to ZnO NPs (i.e. fcR=M_(CsPbBr_3)/M_(ZnO)). the photocurrent from the lateral photodetector was greatly enhanced and, the dark current was suppressed to as low as 10~(12) A due to the lateral configuration by employing a 50 pm-width active layer made through an interdigital mask. As a result, the On/Off current ratio of the lateral photodetector Ag/CsPbBr_3:ZnO/Ag reaches to more than 10~3 for an optimum molar ratio k_R= 1:1, and it is 300-folds higher than that of the control device Ag/CsPbBr_3/Ag, showing a maximum specific detectivity D* of 1.6 × 10~(11) Jones with a photoresponsivity of 3.8 mA/W under 16 pW/cm~2 405 nm illumination at - 5 V. In this way, it provides an efficient method for solution-processed high-performance photodetectors by combining bulk heterojunction and lateral configuration.

    (163055)Bi_2WO_6-wrapped 2D Ni-MOF sheets with significantly improved photocatalytic activity by a direct Z-scheme electron transfer

    Lin ChengMin XieYitong Sun
    11页
    查看更多>>摘要:Constructing Z-scheme heterojunction is considered to be a promising strategy to isolate photogenerated carriers and boost the activity of the photocatalysts. Here in, a novel Z-scheme Bi_2WO_6/Ni-MOF heterojunction with intimate interface was constructed via wrapping flowerlike Bi_2WO_6 on 2D Ni-MOF sheets. The resultant Bi_2WO_6/Ni-M0F heterojunction displayed superior photocatalytic performance with respect to methylene blue degradation under visible light illumination. When the content of Ni-MOF was 20 wt%, the Bi_2WO_6/Ni-M0F heterojunction achieved the highest activity, which was 24.0 and 6.4 folds that of the pristine Ni-MOF and Bi_2WO_6, respectively. The superior degradation performance was caused by the formation of a direct Z-scheme heterostructure between Ni-MOF and Bi_2WO_6, which boosted the separation of photoinduced carriers. The principal active species and possible photocatalytic mechanism were also explored. This study provides a pathway to design and fabricate efficient Z-scheme photocatalysts for environmental remediation.

    (162680)Alloy design strategy to improve fluidity of Zr-based bulk metallic glass for near-net-shape manufacturing

    Wook Ha RyuKyung Jun KimGeun Hee Yoo
    7页
    查看更多>>摘要:The near-net-shape manufacturing via casting has great potential to commercialize bulk metallic glasses (BMGs) for the complex-shaped structural material. However, it is difficult to cast BMGs with the excellent glass-forming ability (GFA) into the precise dimensions of complex shapes, because the slow kinetics of crystallization of the BMG is related to the high viscosity and low fluidity of the melt. In this study, to overcome this limitation, Zr-based BMG with excellent GFA, hardness, and significantly improved fluidity compared to Vitreloy 106 was systematically developed. Utilizing the ZrCuNi liquidus projection, it is possible to design BMG-forming alloy compositions with a low liquidus temperature (T_L) by compositional tuning in the ZrCuNiAl quaternary alloy system. We also propose an alloy design methodology that can simultaneously improve the key properties of Zr-based BMGs by minor addition. Interestingly, Ag can be added instead of Zr in ZrCuNiAl alloys, resulting in higher hardness and lowest T_L without deterioration of GFA. Thus, the addition of Ag can lead to a significant increase in flow length of about 40% compared to that of Vitreloy 106, because the T_L is a dominant factor that determines fluidity under various casting conditions. This study shed light on how to simultaneously improve the dimensional accuracy of BMG products and life span of casting facilities when manufacturing through various conventional casting methods, which should be important to fabricate macro to nano-sized industrial parts through BMGs.

    (163128)Nb_2O_5 quantum dots confined in multi-chamber yeast carbon for sodium ion hybrid capacitors

    Yue LianNing YangYongqing bai
    8页
    查看更多>>摘要:As a burgeoning energy storage equipment, more attention has been paid to sodium ion hybrid super-capacitor (Na-HSC) with large energy/power density and long cycle life. Anode materials with high Na~+ embedding rate are the key for its development. In this work, multi-chamber microspheres with Nb_2O_5 quantum dots (T-Nb_2O_5@YC) were prepared from yeast enriched with Nb~(5+) and by simple hydrothermal-carbonization. Na~+ half-cell and Na-HSC have excellent electrochemical performance. To be specific, Na+ half battery with T-Nb_2O_5@YC delivers up to 195.7 mA h g~(-1) and maintains 84% discharge capacity after 2000 cycles. Moreover, Na-HSC assembled with T-Nb_2O_5@YC as anode has high energy density (62.5 Wh kg~(-1)) and power density (1250 W kg~(-1)).