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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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    Effects of silicon composition on glass formation, crystallization behavior, phase evolution and magnetic properties of the melt-spun Mn-Si-B ribbons

    Luo, TingYang, YuanzhengWang, GuotaiXu, Jia...
    7页
    查看更多>>摘要：The glass formation, crystallization behavior, phase precipitation, and magnetic properties for a series of melt-spun Mn93-xSixB7 (x = 15, 20, 25, 30) amorphous ribbons were investigated. For x = 15 and 20 amorphous alloys, the crystallization shows one-stage behavior but different precipitated phases. For x = 25 amorphous alloy, a two-stage crystallization behavior occurs, in which the first and second crystallized peaks precipitate the Mn5Si3 and Mn2B, respectively. The broad maximum peak emerges at the temperature-dependent magnetization M(T) curves, indicating the amorphous alloys' spin glass (SG) behavior. Furthermore, the nanocrystalline and amorphous composite structure (NACS) consisting of the single nanocrystalline Mn5Si3 and amorphous phase can be achieved for the amorphous Mn93-xSixB7 alloy with x = 25 by controlling the annealing temperature and duration. The magnetic transitions of the NACS sample significantly differ from the counterpart of its amorphous state. The amorphous alloy undergoes the magnetic phase transition from SG into a paramagnetic state at about 20 K. In comparison, the annealed NACS sample first transforms the SG into a ferromagnetic state at about 15 K and then into a paramagnetic state around 300 K. The difference could attribute to the coupling effect between the nanocrystalline Mn5Si3 with the amorphous phase. (C)& nbsp;2022 Published by Elsevier B.V.
      原文链接:
    • NSTL
    • Elsevier

    High-temperature deformation behavior and processing maps of a novel AlNbTi3VZr1.5 refractory high entropy alloy

    Yu, ZhenxiangXie, BijunZhu, ZhengwangXu, Bin...
    11页
    查看更多>>摘要：High-temperature deformation behaviors of a nonequiatomic novel AlNbTi3VZr1.5 refractory high entropy alloy were studied. Hot compression tests were carried out at different temperatures ranging from 1100 to 1250 celcius and various strain rates from 0.001 to 1 s(-1). The true stress-true strain curves indicated obvious sharp drops in the flow stress after reaching peak stress. This may be caused by either dislocation unlocking from a substitutional solute atmosphere or destroying short-range ordered structures. Flow stress analysis was investigated by introducing the Arrhenius constitutive relation. The apparent activation energy (Q) for high-temperature deformation was calculated to be 228.1 kJ/mol. The processing maps show that the best processing window was determined at 1200-1250 ?degrees C and 10-0.75 to 1 s(-1). Detailed microstructure evolution characterization with EBSD analysis shows that the occurrence of discontinuous dynamic recrystallization along grain boundaries is the main softening mechanism of the AlNbTi3VZr1.5 RHEA during the hot compression deformation. The size and volume percentage of dynamically recrystallized grains increase as the Z parameter decreases. (C)& nbsp;2022 Published by Elsevier B.V.
      原文链接:
    • NSTL
    • Elsevier

    Cathode materials of metal-ion batteries for low-temperature applications

    Pang, XiaowanAn, BaigangZheng, ShuminWang, Bao...
    21页
    查看更多>>摘要：Energy storage devices have been developed greatly in recent years. Developing forward, they are expected to operate stably in electric vehicles, electric grids, military equipment, and aerospaces in various climates. Unfortunately, these areas require batteries to be repeatedly and periodically exposed to sub-zero temperatures, even extremely low temperatures (-40 degrees C or lower). The low temperature reduces the kinetics of all the activation processes of the batteries, leading to increased impedance and polarization, and loss of battery energy and power, thus restricting their performance. Developing new cathode materials is one of the main strategies to alleviate the low-temperature restrictions. A conventional lithium-ion battery is the most attractive system, which is more adaptive to the practical low-temperature application now. Sodium ion batteries, magnesium-ion batteries, and zinc-ion batteries, which have the advantages of low cost and high safety, are considered potential substitutes for lithium-ion batteries, the electrochemical performance of these batteries at low-temperature has been conducted extensively. This review provides an overview of lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, and zinc-ion batteries that can work normally in low-temperature environments, with emphasis on various high-energy cathode materials, mainly including polyanionic compounds, layered oxides, spinel oxides, Prussian blue, and Prussian blue analogs. Specifically, we propose how the conventional low-temperature charge-transfer resistance can be overcome. However, these chemistries also present their own unique challenges at low temperatures. This article discusses the advantages and disadvantages of these materials, as well as the main challenges and strategies for applying them to batteries at low temperatures so that the batteries can still discharge efficiently.(c) 2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Sol-gel-based metal-oxide thin-film transistors for high-performance flexible NMOS inverters

    Park, Sang -JoonHa, Tae-Jun
    8页
    查看更多>>摘要：High-performance metal-oxide thin-film transistors (oxide-TFTs) with high-k zirconium dioxide (ZrO2) dielectric and indium-gallium-zinc oxide (IGZO) semiconducting films were developed on flexible polyimide substrates. The flexible IGZO-TFTs fabricated using a simple and effective sol-gel-based solution -process combined with oxygen-enriched consecutive annealing at 200 & DEG;C, exhibited a high field-effect mobility of 13.6 cm(2) V-1 s(-1) at 5 V, on/off ratio of 1.05 x 10(6), gate leakage current of 2.7 x 10(-11) A, and threshold voltage of 0.44 V. The effects of O-2 annealing on the film quality of the sol-gel-based ZrO2 and IGZO were investigated by analyzing the crystallinity, morphology, and degree of metal-oxygen bonding states. Temperature-dependent steady-state direct-current measurements over the temperature range of 90-300 K, and time-domain non-quasi-static transient measurements with a minimized resistance-capacitance time constant were performed. Thus, the activation energy, density of states, interface trap density, and velocity distribution were determined to investigate the charge transport mechanism responsible for the high performance of the oxide-TFTs proposed in this study. An enhancement-load-type N-channel metal-oxide semiconductor (NMOS) inverter consisting of two oxide-TFTs fabricated via O-2 annealing was demonstrated. The flexible NMOS inverter exhibited a high gain of 10.8 at 5 V and outstanding mechanical stability against 10,000 cycles of bending stresses at a strain of 30% without a passivation or buffer film.(c) 2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Synthesis and spark plasma sintering of solid-state matrices based on calcium silicate for Co- 60 immobilization

    Papynov, E. K.Belov, A. A.Azon, S. A.Buravlev, I. Yu...
    12页
    查看更多>>摘要：An effective sorption material for the immobilization of cobalt radionuclides into highly safe and reliable solid-state matrices is proposed. The resulting silicate sorbent CaSiO3 had an amorphous mesoporous structure (ABET 53 m2/g) and a sorption capacity Co ions of 3.32 mmol/g. The physico-chemical characteristics of the CaCoSi2O6 sample obtained after Co2+ ions sorption were studied using XRD, N2 and Ar adsorption-desorption, SEM-EDX and TG/DTA methods. Solid-state silicate matrices characterized by high density values (2.86-3.16 g/cm3), compressive strength (150-637 MPa) and Vickers microhardness (1.80-5.25 GPa) were obtained by spark plasma sintering (SPS). The sample obtained at 1000 degrees C had the lowest values of Co2+ ions leaching (RCo ~10-7 g/(cm2xday)) and diffusion coefficient (De 1.73 x10-17 cm2/s) from silicate matrices. Thus, the obtained CaCoSi2O6 silicate matrices saturated with Co ions comply with the regulatory requirements of GOST R 50926-96 and ANSI/ANS 16.1 for 60Co immobilization. (c) 2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    Original KGd2F7 nanocrystals in fluoro-oxide glass ceramics by Dy3+/Sm3+ co-doped for white light emission

    Ye, GuoquanFang, LizhiZhou, XiongXia, Haiping...
    9页
    查看更多>>摘要：Serial fluoro-oxide glass ceramics (GCs) containing 0.6 mol% Dy3+ and various Sm3+ from 0 mol% to 1.5 mol% co-doped novel KGd2F7 nanocrystals were firstly fabricated through high temperature melt-quenching method. Then the microscopic structure of the GCs was revealed by transmission electron microscopy (TEM). And the rare-earth ions (RE3+) of Dy3+ and Sm3+ were successfully doped in monoclinic-phase KGd2F7 nanocrystals, which can be verified by energy-dispersive X-ray spectroscopy (EDX) mappings. The photoluminescence spectra of the GCs were probed systematically utilizing 365 nm excitation light. The yellow (573 nm), green (486 nm), and red (648 nm) multiple emissions were observed in the co-doped GCs, and the intensity of red became stronger because of the higher Sm3+ doping concentrations. This contribution of multiple emissions is due to the co-absorption of both Dy3+ and Sm3+ for 365 nm and the presence of energy transfer (ET). Moreover, the ET between Dy3+ and Sm3+ was confirmed from the variations of emission spectra and measured decay curves of emissions. Furthermore, the maximum energy transfer efficiency (ETE) from Dy3+ to Sm3+ can reach ~60.34% and the internal quantum yield (QY) is computed to be around 31.82% upon excitation of 365 nm. The chromaticity coordinates (CIE (Commission Internationale de L'Eclairage)- 1931) of the GCs can be tuned effectively through changing activator con-centrations. Ideal white light emission is at the CIE (0.3357, 0.3342), which was achieved for 0.6 mol% Dy3+/ 0.9 mol% Sm3+ doped GCs sample. The results indicated that Dy3+/Sm3+ co-doped GCs with both high thermal and chemical-physical stabilities have strong potential application in white light-emitting diodes and fluorescent display devices. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier

    The effects of Zr content and hot rolling on the microstructure and mechanical properties of Zn-1.5Cu-1.0Ag-xZr alloys

    Jin, HualanYang, LeiLai, YonglaiLiu, Yong...
    9页
    查看更多>>摘要：In this work, Zn-1.5Cu-1.0Ag-xZr (x = 0, 0.1, 0.5, 1.0) alloys were used as raw materials to research the effects of Zr content and hot rolling on the microstructure and mechanical properties of the alloys. The results revealed that as-cast Zn-1.5Cu-1.0Ag alloy was composed of eta-Zn phase and (Ag, Cu) Zn4 phase. After Zr addition, Zn22Zr was precipitated in both as-cast and as-rolled Zn-1.5Cu-1.0Ag-xZr alloys, and a new phase of CuZn5 was observed in as-rolled Zn-1.5Cu-1.0Ag-xZr alloys, resulting in the second phase strengthening. It was demonstrated that the grain sizes of the as-rolled alloys were much smaller than those of as-cast alloys, while Zr had slight effects on the grain sizes. In addition, Zn-1.5Cu-1.0Ag-0.1Zr alloy has the best as cast and as-rolled mechanical properties, and the yield strength, ultimate tensile strength and elongation of above two alloys are 84.18 +/- 0.71 MPa, 117.79 +/- 0.52 MPa, 3.73 +/- 0.40% and 218.14 +/- 0.04 MPa, 244.83 +/- 0.57 MPa, 64.50 +/- 4.60%, respectively. Moreover, the strength and elongation of both as-cast and as-rolled Zn-1.5Cu-1.0Ag-xZr alloys increase initially and then decline with the increase of Zr content. (C)& nbsp;2022 Elsevier B.V. All rights reserved.
      原文链接:
    • NSTL
    • Elsevier