Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
Impact factor:6.155

The journal has been awarded the excellent periodical in China, and its articles are covered by SCI, EI, CA, SA, JST, RJ, CSA, MA, EMA, AIA etc., PASCAL web. ISI web of Science,SCOPUS.

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      15 January 2020, Volume 37 Issue 0 Previous Issue    Next Issue
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    Research Article
    Improving WC-Co coating adhesive strength on rough substrate: Finite element modeling and experiment
    Adnan Tahir, Guang-Rong Li, Mei-Jun Liu, Guan-Jun Yang, Cheng-Xin Li, Yu-Yue Wang, Chang-Jiu Li
    J. Mater. Sci. Technol., 2020, 37 (0): 1-8.  DOI: 10.1016/j.jmst.2019.07.033
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    The adhesive strength in a coating-substrate system is of primary importance for the coating lifetime in service. However, the underlying mechanism is not fully understood due to the complex internal structure of composite coatings. In this study, the effect of substrate roughness on the adhesive strength of WC-Co coatings was investigated by experiment and simulation. Results show that the adhesive strength is significantly affected by the roughness. In the case of the Ra<2 μm, the adhesive strength is approximately 35-46 MPa. When the Ra is 4 μm, the adhesive strength increases to nearly 60 MPa. A finite element model was developed to correlate the roughness with adhesive strength. It is found that the predicted values are well consistent with the experimental data. In addition, with the increase of the roughness, the residual stress would be changed from concentrated state to widespread state, which decreases the critical stress to result in crack propagation. That’s why a larger roughness can cause a higher adhesive strength. This study gives understanding on the mechanism of adhesive strength affected by roughness, which contributes to the parameter optimization with better performance.

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    Hydrophobic epoxy resin coating with ionic liquid conversion pretreatment on magnesium alloy for promoting corrosion resistance
    Liting Guo, Changdong Gu, Jie Feng, Yongbin Guo, Yuan Jin, Jiangping Tu
    J. Mater. Sci. Technol., 2020, 37 (0): 9-18.  DOI: 10.1016/j.jmst.2019.06.024
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    A hydrophobic epoxy resin coating with an environmental-friendly deep eutectic solvent (DES)-based conversion pretreatment was proposed to enhance the corrosion resistance of magnesium alloys. The hydrophobic epoxy resin coatings on the AZ31B magnesium alloy with and without the DES-based conversion pretreatment were thoroughly compared. It is found that the DES-based conversion film on the AZ31B magnesium alloy is mainly composed of MgH2, MgO and MgCO3. Furthermore, the conversion film possesses porous structure, which provides more anchor points for the following epoxy resin coating. However, without the DES-conversion pretreatment, the epoxy resin is difficult to be attached on the substrate during the dip-coating process. The double layered hybrid coating system promotes the corrosion resistance of the magnesium alloys significantly, which can be ascribed to the unique architecture and component including the hydrophobicity of the surface layer, the dense and interlocked epoxy resin, and the corrosion resistant DES-based conversion pretreatment.

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    Impregnation approach for poly(vinylidene fluoride)/tin oxide nanotube composites with high tribological performance
    Min Su Park, Jin Kyu Kim, Tong-Seok Han, Jung Tae Park, Jong Hak Kim
    J. Mater. Sci. Technol., 2020, 37 (0): 19-25.  DOI: 10.1016/j.jmst.2019.07.038
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    We report a composite material with the high tribological performance, which consists of one-dimensional SnO2 nanotubes (ST) and a high molecular weight poly(vinylidene fluoride) (PVDF) matrix in terms of nano-impregnation. Dissolution of PVDF in N,N-dimethylformamide (DMF) resulted in a facile penetration of PVDF into the inner hollow voids of ST, leading to the close contact. Interaction between PVDF and ST results in a beneficial effect on the chain arrangement of PVDF, providing an α-phase with better tribological property. Upon ST incorporation, the friction coefficient decreased by 85.0% to 0.408, and the specific wear rate decreased by 69.1% to 0.412, demonstrating the pivotal role of ST as a self-lubricating material due to a large interactive area and PVDF chain rearrangement.

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    Influence of minor Ce additions on the microstructure and mechanical properties of Mg-1.0Sn-0.6Ca alloy
    Yanfu Chai, Chao He, Bin Jiang, Jie Fu, Zhongtao Jiang, Qingshan Yang, Haoran Sheng, Guangsheng Huang, Dingfei Zhang, Fusheng Pan
    J. Mater. Sci. Technol., 2020, 37 (0): 26-37.  DOI: 10.1016/j.jmst.2019.07.036
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    The microstructure and mechanical properties of Mg-Sn-Ca-Ce alloys with different Ce contents (0.0, 0.2, 0.5, 1.0 wt%) were studied at room temperature. Ce additions to ternary Mg-Sn-Ca alloy resulted in grain refinement as well as a change in the category of second phase from CaMgSn to (Ca, Ce)MgSn and Mg12Ce. The volume fraction of second phase increased with rising Ce content, which aggravated the restriction of DRXed grain growth during the extrusion process and eventually led to texture weakening of as-extruded Mg-Sn-Ca based alloys. In terms of plasticity, owing to vigorously activated basal slip and homogeneous distributed tensile strain in tension, the tensile ductility of as-extruded alloys reached the maximum value of 27.6% after adding 0.2 wt% Ce, which enhanced by about 26% than that of ternary Mg-Sn-Ca alloy. However, further Ce additions (0.5 and 1.0 wt%) would coarsen the second phase particles and then impair ductility. The tension-compression yield asymmetry of as-extruded Mg-Sn-Ca ternary alloy was alleviated greatly via Ce additions, due to the joint effects of grain refinement, increased amount of strip distributed second phase particles and texture weakening.

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    Dual effect of Cu on the Al3Sc nanoprecipitate coarsening
    Y.H. Gao, L.F. Cao, J. Kuang, J.Y. Zhang, G. Liu, J. Sun
    J. Mater. Sci. Technol., 2020, 37 (0): 38-45.  DOI: 10.1016/j.jmst.2019.07.035
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    It is generally considered that the Al3Sc nanoprecipitates are highly thermal stable, mainly due to quite slow Sc diffusion in the α-Al matrix. In this paper, we demonstrate in an Al-Cu-Sc alloy that the Cu atoms have dual effect on the coarsening of Al3Sc nanoprecipitates. On the one hand, the Cu atoms with high diffusivity tend to accelerate the Al3Sc coarsening, which results from the Cu-promoted Sc diffusion. On the other hand, some Cu atoms will segregate at the Al3Sc/matrix interface, which further stabilizes the Al3Sc nanoprecipitates by reducing the interfacial energy. Competition between these two effects is tailored by temperature, which rationalizes the experimental findings that the coarsening kinetics of Al3Sc nanoprecipitate is greatly boosted at 300 °C-overaging while significantly suppressed at 400 °C-overaging.

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    Oxidation behaviors of TA15 titanium alloy and TiBw reinforced TA15 matrix composites prepared by spark plasma sintering
    Dongjun Wang, Hao Li, Wei Zheng
    J. Mater. Sci. Technol., 2020, 37 (0): 46-54.  DOI: 10.1016/j.jmst.2019.07.037
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    The purpose of this study is to investigate the oxidation behaviors of the TA15 titanium alloy and TiBw/TA15 composite with network microstructure in the temperature range of 873-1073 K. The results show that the oxidation kinetics of the TA15 titanium alloy and TiBw/TA15 composite follows different laws at various oxidation temperatures. Moreover, the effective activation energy Q for oxidation of the TA15 titanium alloy and TiBw/TA15 composite is determined to be 299 ± 19.9 kJ/mol and 339 ± 8.31 kJ/mol at the temperature of 973-1073 K, respectively. The experimental achievements of oxidation kinetics and oxide scales formed in the test temperatures indicate that the TiBw/TA15 composite exhibits a higher oxidation resistance than TA15 titanium alloy. A schematic diagram of oxidation mechanism is established to further reveal the oxidation process for TiBw/TA15 composite at elevated temperatures.

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    Synergetic effect of graphene and Co(OH)2 as cocatalysts of TiO2 nanotubes for enhanced photogenerated cathodic protection
    Xiayu Lu, Li Liu, Xuan Xie, Yu Cui, Emeka E. Oguzie, Fuhui Wang
    J. Mater. Sci. Technol., 2020, 37 (0): 55-63.  DOI: 10.1016/j.jmst.2019.07.034
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    A layer of graphene (GR) particles was successfully deposited at the interface between Co(OH)2 nanoparticles and TiO2 nanotubes, aiming to improve the photoelectrochemical performance of the large-bandgap semiconductor TiO2. The obtained Co(OH)2/GR/TiO2 was extensively characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis absorption spectra and photoluminescence (PL) emission spectra. Electrochemical impedance spectra, photogenerated potential-time (E-t) photocurrent density-time (i-t) and i-E curves and open circuit potential (OCP) curves were measured to investigate the photoelectrochemical activities and photogenerated cathodic protection properties. The results revealed that Co(OH)2/GR/TiO2 exhibits excellent photoelectrochemical and photogenerated cathodic performance due to synergistic effect between Co(OH)2 and graphene. Co(OH)2 and graphene co-modified TiO2 photoanode could provide an effective protection for 304 stainless steel (304SS) in 3.5 wt% NaCl solution for 12 h, which would be promising for future practical applications in the field of marine corrosion protection.

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    Deformation behavior of a TiZr-based metallic glass composite containing dendrites in the supercooled liquid region
    Longjun Wu, Zhengwang Zhu, Dingming Liu, Huameng Fu, Hong Li, Aimin Wang, Hongwei Zhang, Zhengkun Li, Long Zhang, Haifeng Zhang
    J. Mater. Sci. Technol., 2020, 37 (0): 64-70.  DOI: 10.1016/j.jmst.2019.07.012
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    The deformation behavior of a TiZr-based bulk metallic glass composite (BMGC) was characterized in the supercooled liquid region (SLR) from 623 K to 693 K. It was observed that the alloy exhibits the deformation behavior from work softening at low temperatures to work hardening at high temperatures. The yield stress and overshoot stress decrease remarkably with the increase of temperature, accompanied by superplasticity. The results showed that the crystallization occurred in the amorphous matrix for the post-deformation samples and the volume fraction of the corresponding crystallization products increased with increasing testing temperature. It is implied that the work hardening behavior was closely associated with the crystallization of the amorphous matrix. The tensile stress can accelerate the crystallization of amorphous matrix and the martensitic transformation of dendrite phases, which implies that the thermal stability of the alloy decreases under tension. These findings shed light on designing new BMGCs with high mechanical performance as well as the good SLR formability.

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    Transfer-free CVD graphene for highly sensitive glucose sensors
    Shijing Wei, Yabin Hao, Zhe Ying, Chuan Xu, Qinwei Wei, Sen Xue, Hui-Ming Cheng, Wencai Ren, Lai-Peng Ma, You Zeng
    J. Mater. Sci. Technol., 2020, 37 (0): 71-76.  DOI: 10.1016/j.jmst.2019.07.039
    Abstract   HTML   PDF

    Chemical vapor deposition (CVD) graphene film is a promising electrode-modifying material for fabricating high-performance glucose sensor due to its high electrical conductivity and two-dimensional structure over large area. However, the use of typical metal-based CVD graphene suffers from the residue contamination of polymer transfer-support and heavy metal ions. In this work, we directly grew few-layer graphene on the SiO2/Si substrate without transfer process and then fabricated graphene-based glucose sensors by sequentially immobilizing glucose oxidase and depositing Nafion layer on its surface that was functionalized by oxygen-plasma treatment. Our transfer- and metal-free process shows distinct advantage over the common metal-CVD method in improving the electrochemical performance by eliminating the contamination of transfer-residue. Thus-obtained glucose sensor shows a high sensitivity (16.16 μA mM-1 cm-2) with a detection limit of 124.19 μM. This method is simple and promising for the development of highly sensitive glucose sensors.

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    Synthesis and characterization of nanosized Ti3AlC2 ceramic powder by elemental powders of Ti, Al and C in molten salt
    Huijun Liu, Ying Wang, Lingxu Yang, Ruijia Liu, Chaoliu Zeng
    J. Mater. Sci. Technol., 2020, 37 (0): 77-84.  DOI: 10.1016/j.jmst.2019.02.009
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    A simple method to synthesize high-content ternary carbide Ti3AlC2 nanoparticles from Ti, Al, and C starting elemental powders without ball milling in NaCl-KCl molten salt was reported. The effects of mass ratio of the salt to starting materials, temperature, reaction time, and Al molar ratio on preparation of Ti3AlC2 were investigated. The Ti3AlC2 formation is dramatically influenced by temperature and mass ratio of the salt to raw materials: a higher temperature and higher mass ratio of the salt to raw materials are more preferable for Ti3AlC2 powder formation. Homogenous Ti3AlC2 powder with particle size of ~100 nm is synthesized by 3Ti/Al/2C starting elemental powders in NaCl-KCl molten salt at 900 °C for 10 h, 950 °C for 5 h, or 1000 °C for 2 h, respectively, when the mass ratio of the salt to 3Ti/Al/2C starting materials is 10:1.

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    A new strategy for corrosion protection of porous stainless steel using polypyrrole films
    C. Garcia-Cabezon, C. Garcia-Hernandez, M.L. Rodriguez-Mendez, F. Martin-Pedrosa
    J. Mater. Sci. Technol., 2020, 37 (0): 85-95.  DOI: 10.1016/j.jmst.2019.05.071
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    In this work, a method to improve the protection against corrosion of porous sintered stainless steel is presented. It is based on the electrodeposition of polypyrrole (PPy) layers doped with a large size counterion such as dodecylbenzenesulphonic acid (DBSA), a conducting polymer with high corrosion resistance and good biocompatibility. The efficacy of PPy coating depends on the adequate adhesion between the metal substrate and the coating layer. The protection against corrosion has been tested using 316 L stainless steel (SS) powder sintered at different conditions to evaluate the effect of the sintering atmosphere (nitrogen and vacuum) and cooling rates (furnace and water) on corrosion resistance, while wrought 316 L SS has been used as reference material. In addition, two electrochemical deposition techniques have been tested to select the most adequate. Open circuit potential evolution, anodic polarization measurements and electrochemical impedance spectra have been used to evaluate corrosion protection in phosphate buffer saline medium. It has been evidenced that a more homogeneous and stable coating was obtained in the case of porous stainless steel. The corrosion potential shifted to nobler values and the anodic polarization branch became more stable. Coated porous samples have a good passivation performance with a lower stable passive current density and a higher breakdown potential. The transfer electronic resistance and the impedance module increase more than one order of magnitude. Therefore, the porosity of sintered stainless steel is seen as an advantage for the improvement of the adherence of the PPy coatings. The best corrosion protection is found for samples sintered in nitrogen and water-cooled.

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    Prospective
    Preparation and application of microfluidic SERS substrate: Challenges and future perspectives
    Jiuchuan Guo, Fanyu Zeng, Jinhong Guo, Xing Ma
    J. Mater. Sci. Technol., 2020, 37 (0): 96-103.  DOI: 10.1016/j.jmst.2019.06.018
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    Surface-enhanced Raman spectroscopy (SERS), as a highly sensitive molecular analysis technique, can realize fast and non-destructive detection of the information of molecular bonds to identify the component of analytes by “fingerprint” identification. The preparation of SERS substrates plays an extremely important role in the development of SERS technology and the application of SERS detection. By integrating SERS enhancement substrates into microfluidic chips, researchers have developed the microfluidic SERS chips which expand the function of microfluidic chips and provide an efficient platform for on-site biochemical analysis equipped with the powerful sensing capability of SERS technique. In this paper, we will first briefly give a review of the current microfluidic SERS-active substrates preparation technology and present the perspective on the application prospects of microfluidic SERS-active substrates. And then the challenges in the preparation of microfluidic SERS-active substrates will be pointed out, as well as realistic issues of using this technology for biochemical application.

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    Research Article
    Enhanced protective coatings on Ti-10V-2Fe-3Al alloy through anodizing and post-sealing with layered double hydroxides
    Lei Liu, Liang Wu, Xiaobo Chen, Deen Sun, Yuan Chen, Gen Zhang, Xingxing Ding, Fusheng Pan
    J. Mater. Sci. Technol., 2020, 37 (0): 104-113.  DOI: 10.1016/j.jmst.2019.07.032
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    Anodic oxidation is a prevalent technique to introduce superior corrosion and wear resistance upon the surface of titanium (Ti) alloys, in which the selection of appropriate electrolytes and defect-sealing strategies is a key. This study aims to address such issues through anodizing Ti-10V-2Fe-3Al alloy in malic acid, followed by a post-sealing treatment with Mg-Al layered double hydroxides (LDHs). The characteristics of the samples were investigated using scanning electron microscopy (SEM), atomic force microscopy (AFM), glow discharge optical emission spectroscopy (GDOES), X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDS). SEM micrographs reveals that the anodic coating had a surface full of bulges and cracks, and was almost sealed by the following LDHs treatment. XRD pattern indicate that the anodic coating was mainly consisted of amorphous TiO2 with a small fraction of anatase, but its crystallization degree was increased through the post-sealing. Moreover, electrochemical and tribological measurements demonstrate that corrosion current density was 2.8 × 10-6, 2.0 × 10-7, 5.9 × 10-9 A cm-2, and wear rate was 1.45 × 10-3, 1.30 × 10-4 and 6.90 × 10-5 mm3 N-1 m-1 for respective bare Ti-10V-2Fe-3Al alloy substrate, anodized specimens without and with the LDHs post treatment. Finally, a plausible wear mechanism was proposed.

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    Improvement on compressive properties of lotus-type porous copper by a nickel coating on pore walls
    Hao Du, Chuanyu Cui, Housheng Liu, Guihong Song, Tianying Xiong
    J. Mater. Sci. Technol., 2020, 37 (0): 114-122.  DOI: 10.1016/j.jmst.2019.06.017
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    The aim of this work is to understand the effect of a thin coating on the compressive properties of the porous metal. In our work, the uniaxial compressive behavior and the energy absorption properties of the lotus-type porous copper deposited with Ni coatings with thickness from 3.9 to 4.8 μm on pore walls were investigated. It is found that the Ni coating on pore walls shows a clear enhancement effect on compressive properties of the lotus-type porous copper, in which the specific yield strength and the energy absorption per unit mass at densification strain increase from 5.27 to 7.31 MPa cm3 g-1 and from 11.50 to 18.21 J g-1 with the Ni coating, respectively. Furthermore, the enhancement appears to be insensitive to the coating thickness. It is considered that the resistance of the interface between the nickel coating and the pore walls to the dislocation slip plays an important role in the improvement on compressive properties of the lotus-type porous copper.

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    Improved interfacial wetability in Cu/ZnO and its role in ZnO/Cu/ZnO sandwiched transparent electrodes
    Mingshi Yu, Guancheng Wang, Rongrong Zhao, Enze Liu, Tonglai Chen
    J. Mater. Sci. Technol., 2020, 37 (0): 123-127.  DOI: 10.1016/j.jmst.2019.06.019
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    Oxide/metal/oxide (OMO) and its derivatives are considered as the promising alternatives to achieve high performance transparent electrodes (TEs). The percolation thickness and conductivity of the metal layer are very crucial for the optoelectrical properties of any OMO TE. Here, we report a facile method to promote the initial growth of the metal layer by improving the interfacial wettability between O-M interface. By subsequently combined with high-quality zinc oxide (ZnO) films, ZnO/Cu/ZnO TEs that have not only low sheet resistance (19.3 Ω/sq) but also enhanced thermal stability can be obtained, with a performance of an average transmittance of 84.4% over the visible spectral range of 400-800 nm.

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    (NH4)3PW12O40-H3PO4 composites as efficient proton conductors at intermediate temperatures
    Xiaoxiang Xu, Shunhang Wei
    J. Mater. Sci. Technol., 2020, 37 (0): 128-134.  DOI: 10.1016/j.jmst.2019.06.022
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    (NH4)3PW12O40 and (NH4)3PW12O40-H3PO4 composites have been synthesized by precipitation method. Their phase compositions, thermal stability and morphologies have been investigated. The synthesized composites maintain the same structures as pure (NH4)3PW12O40 where phosphoric acid is preserved in residual space of the “spongy crystals” of (NH4)3PW12O40. FT-IR spectra confirm the strong interactions between phosphoric acid and Keggin ions. Pristine (NH4)3PW12O40 shows poor conductivity in air at high temperatures and strongly depends on water molecules for proton transport. The composites exhibit a much higher conductivity compared with pure (NH4)3PW12O40. The highest conductivity achieved is 0.14 S/cm at 170 °C where continuous channels based on phosphoric acid for proton transportation are probably established. Such high conductivity of (NH4)3PW12O40-H3PO4 composites implies promising applications in fuel cells and other electrochemical devices.

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    Binary Co-Ni oxide nanoparticle-loaded hierarchical graphitic porous carbon for high-performance supercapacitors
    Yin Liu, Cuili Xiang, Hailiang Chu, Shujun Qiu, Jennifer McLeod, Zhe She, Fen Xu, Lixian Sun, Yongjin Zou
    J. Mater. Sci. Technol., 2020, 37 (0): 135-142.  DOI: 10.1016/j.jmst.2019.08.015
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    Heteroatom doped graphitic porous carbon is highly desirable for electrochemical applications because of its excellent conductivity and high surface area. In this study, highly uniform Co-Ni oxide nanoparticle-loaded B, N-doped hierarchical graphitic porous carbon was prepared through a dual pyrolysis process. Graphene dispersed chitosan hydrogel was first used as a precursor to fabricate the porous carbon (GCS-C) at 700 °C. Co and Ni oxide nanoparticles were further anchored on the porous carbon through chemical reduction and calcined at high temperature. The structure of the porous carbon was optimized by the introduction of graphene to the chitosan hydrogel. The graphitic degree of the porous carbon was significantly improved by the Co and Ni species. The heteroatom B and N were found to be well doped in the composite. These features enable the composite to be an excellent candidate for supercapacitor electrodes. The composite demonstrates a high capacitance (1266.7 F g-1 at 1 A g-1) and excellent stability.

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    Influence of travel speed on microstructure and mechanical properties of wire + arc additively manufactured 2219 aluminum alloy
    Yinghui Zhou, Xin Lin, Nan Kang, Weidong Huang, Jiang Wang, Zhennan Wang
    J. Mater. Sci. Technol., 2020, 37 (0): 143-153.  DOI: 10.1016/j.jmst.2019.06.016
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    Wire + arc additive manufacturing (WAAM) was preliminarily employed to fabricate the 2219 aluminum alloy. The influence of the electric arc travel speed (TS) on the macro-morphology, microstructure, and mechanical properties were investigated. The results indicated that as the electric arc TS increased, the size and the volume fraction of equiaxed grain decreased. The high arc TS during WAAM also promoted the precipitation of the θ (Al2Cu) phase. The volume fractions of θ″ and θ′ phases reached maximum values when TS is 350 and 250 mm/min, respectively. The thermal cycle facilitated the precipitation of the θ′ phase. In addition, the micro-hardness and tensile strength of the alloy were analyzed, and the results indicated that samples fabricated at TS of 350 mm/min possessed finer equiaxed grain and exhibited higher ultimate tensile strength (273.5 MPa) and yield strength (182.9 MPa) compared to those fabricated at 250 mm/min.

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    Powder metallurgy synthesis of porous Ni-Fe alloy for oxygen evolution reaction and overall water splitting
    Wenbo Li, Qingfeng Hu, Yunwei Liu, Mengmeng Zhang, Jiajun Wang, Xiaopeng Han, Cheng Zhong, Wenbin Hu, Yida Deng
    J. Mater. Sci. Technol., 2020, 37 (0): 154-160.  DOI: 10.1016/j.jmst.2019.06.021
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    Developing inexpensive and high efficient catalysts is essential for generating oxygen and hydrogen via water splitting. Herein, based on powder metallurgy, a Ni-Fe based compound (Ni8Fe2 alloy) with unique porous structure and controllable phase has been designed and synthesized. Without using a solvent or template, the alloy exhibits a porous structure with uniformly distributed multi-phase. The obtained Ni8Fe2 alloy exhibits an efficient oxygen evolution reaction (OER) performance and good long-term stability in alkaline electrolyte (i.e. 1.0 M KOH). Additionally, an alkaline water splitting device has been assembled using porous Ni8Fe2 alloy as both anode and cathode materials. The system requires a cell voltage of 1.65 V to reach the 10 mA cm-2 current density for overall water splitting and maintains good stability for 25 h. The efficient electrocatalytic performance of the Ni8Fe2 alloy is owing to the unique porous microstructure, increased active sites and accelerated charge transfer. Consequently, the reaction kinetics of OER are significantly promoted.

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    Synchronous optimization of strengths, ductility and corrosion resistances of bulk nanocrystalline 304 stainless steel
    S.G. Wang, M. Sun, S.Y. Liu, X. Liu, Y.H. Xu, C.B. Gong, K. Long, Z.D. Zhang
    J. Mater. Sci. Technol., 2020, 37 (0): 161-172.  DOI: 10.1016/j.jmst.2019.05.073
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    Structural materials usually suffer from several attacks during their service, such as tension, fatigue and corrosion. It is necessary to synchronously improve these properties for their lightweight and long-lifetime, but corrosion resistance and ductility are generally inverse correlation with strength, it is very difficult to simultaneously optimize all three properties. However, bulk nanocrystalline 304 stainless steel (BN-304SS) produced by severe rolling technology possessed the larger yield and ultimate tensile strengths with sufficient elongation (> 40%) during tensile test, the larger saturation stress and longer lifetime during low-cycle fatigue, the enhanced uniform and pitting corrosion resistances during five-day immersion test in 6 mol/L HCl, the lowered stress corrosion cracking (SCC) susceptibility with larger yield (~2.40 GPa) and ultimate tensile (~2.66 GPa) strengths, and enough elongation (> 30%) during stress corrosion in comparison with conventional polycrystalline 304 stainless steel (CP-304SS) counterpart. The uniform and pitting corrosion resistances of fractured BN-304SS were enhanced in comprsion with those of fractured CP-304SS during seven-day immersion test in 1 mol/L HCl. These results demonstrated the strengths, ductility and corrosion resistances of BN-304SS can be simultaneously optimized by severe rolling technology. These improved results of BN-304SS in different disciplines were understood by its valence electron configurations rather than traditional microstructural parameters.

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    In-situ synthesis of nanocrystalline TiC powders, nanorods, and nanosheets in molten salt by disproportionation reaction of Ti(II) species
    Lingxu Yang, Ying Wang, Ruijia Liu, Huijun Liu, Xue Zhang, Chaoliu Zeng, Chao Fu
    J. Mater. Sci. Technol., 2020, 37 (0): 173-180.  DOI: 10.1016/j.jmst.2019.08.017
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    A high-efficiency method is developed to in-situ synthesize nanocrystalline TiC powders, nanorods, and nanosheets by using equimolar ratio of Ti powder and acetylene black, multiwalled carbon nanotubes (MWCNTs), and graphene, respectively, as precursor in eutectic NaCl-KCl molten salt at 800-900 °C for 2-3 h. Higher temperature and longer duration are more beneficial for TiC preparation. In addition, mechanism of TiC formation was investigated by linear scan voltammetry. Results indicate that nanocrystalline TiC is in-situ synthesized by reaction between Ti atoms, which come from disproportionation reaction of Ti(II) species in the molten salt, and C atoms on the surface of carbon sources.

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    High performance Sm-Co powders obtained by crystallization from ball milled amorphous state
    Jinkui Fan, Qiang Zheng, Rui Bao, Jianhong Yi, Juan Du
    J. Mater. Sci. Technol., 2020, 37 (0): 181-184.  DOI: 10.1016/j.jmst.2019.04.041
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    Isotropic Sm-Co nanoparticle powders with high coercivity were prepared by high-energy ball milling followed by optimal annealing at different temperatures. The covercivity increased monotonically with increasing of the annealing temperature and a highest coercivity of 31.2 kOe was obtained. The sample with an optimal energy product of 17.0 MGOe still had a coercivity of 18.2 kOe. The evolution of phase, particle size, mechanism of coercivity and other related magnetic properties were analyzed. The excellent performance is attributed to nanoscale size grains below 15 nm and good exchange coupling between nanoparticles.

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    Graphene oxide effects on the properties of Al2O3-Cu/35W5Cr composite
    Xiaohui Zhang, Yi Zhang, Baohong Tian, Yanlin Jia, Ming Fu, Yong Liu, Kexing Song, Alex.A. Volinsky, Xiao Yang, Hang Sun
    J. Mater. Sci. Technol., 2020, 37 (0): 185-199.  DOI: 10.1016/j.jmst.2019.08.014
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    Graphene oxide (GO) nanosheets were dispersed into premixed powders (Cu-0.4 wt% Al/35W5Cr) by wet grinding and vacuum freeze-drying process. The 0.3 wt% GO/Al2O3-Cu/35W5Cr and 0.5 wt%GO/Al2O3-Cu/35W5Cr composites, used for electrical contacts, were fabricated by vacuum hot-pressing sintering. The microstructure was analyzed by field emission scanning electron and transmission electron microscopy. In addition, the Raman spectroscopy and X-ray photoelectron spectroscopy were used to investigate the structural changes of GO before and after sintering. The arc erosion behavior was investigated by the JF04C electrical contact testing apparatus. Consequently, the Al2O3 nanoparticles were evenly dispersed in the matrix, causing dislocation tangles. GO was converted to reduced graphene oxide after sintering. A group of carbon atoms combined with Cr forming Cr3C2 in situ during sintering, which enhanced the interface bonding. Compared with the Al2O3-Cu/35W5Cr composite, the tensile strength of the two contact materials containing 0.3 wt% GO and 0.5 wt% GO was increased by 45% and 34%, respectively. Finally, pips and craters were present on the anode and cathode surfaces, respectively. Tungsten has undergone re-sintering during arcing and formed needle-like structures. Compared with Al2O3-Cu/35W5Cr, the GO/Al2O3-Cu35W5Cr composites have better welding resistance. The final mass transfer direction of the two composites was from the cathode to anode.

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    Microbiologically influenced corrosion of 304L stainless steel caused by an alga associated bacterium Halomonas titanicae
    Yuqiao Dong, Yassir Lekbach, Zhong Li, Dake Xu, Soumya El Abed, Saad Ibnsouda Koraichi, Fuhui Wang
    J. Mater. Sci. Technol., 2020, 37 (0): 200-206.  DOI: 10.1016/j.jmst.2019.06.023
    Abstract   HTML   PDF

    Algae are reported to be corrosive, while little is known about the role of the algae associated bacteria in the corrosion process. In the present study, Halomonas titanicae was isolated from a culture of an alga strain, Spirulina platensis, and identified through 16S rRNA gene analysis. Corrosion behavior of 304L stainless steel (SS) coupons in the presence and absence of H. titanicae was characterized by using electrochemical measurements and surface analysis. The results showed that H. titanicae significantly accelerated the corrosion rate and decreased the pitting potential of 304L SS in the biotic medium. After removal of the corrosion products and biofilms, severe pitting corrosion caused by H. titanicae was observed. The largest pit depth after 14 d reached 6.6 μm, which was 5.5 times higher than that of the sterile control (1.2 μm). This is the first report revealing that an alga associated bacterium can induce microbiologically influenced corrosion (MIC), and a further concern is raised that whether algae play a role in the MIC process.

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ISSN: 1005-0302
CN: 21-1315/TG
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