Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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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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      10 August 2016, Volume 32 Issue 8 Previous Issue    Next Issue
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    Orginal Article
    Effects of Stress Level and Stress State on Creep Ductility: Evaluation of Different Models
    Wen Jian-Feng,Tu Shan-Tung,Xuan Fu-Zhen,Zhang Xue-Wei,Gao Xin-Lin
    J. Mater. Sci. Technol., 2016, 32 (8): 695-704.  DOI: 10.1016/j.jmst.2016.02.014
    Abstract   HTML   PDF

    The last few decades have witnessed an increasing emphasis on the development of strain-based approach for predicting the creep life or damage of components operating at elevated temperatures. Creep ductility, as a key parameter in this approach, may vary with a number of factors including strain rate, state of stress, operating temperature, material microstructure, etc. The present paper, however, is focused on reviewing the state-of-the-art understanding of the effects of stress level and stress state on the creep ductility. Mechanisms involving the void growth and coalescence are presented to describe the role of stress level in the variation of uniaxial creep ductility. The prediction capacity of existing empirical ductility models is also assessed in light of uniaxial test data. On the other hand, a vast body of multiaxial creep test data, collected from open literature, is utilized to examine the influence of the state of stress on the creep ductility. Then, a variety of multiaxial ductility factor models are introduced and evaluated with the available experimental data. Finally, a brief discussion on the dependence of creep ductility on the stress triaxiality and Lode parameter, predicted by numerical methods, is provided.

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    Superelasticity and Tunable Thermal Expansion across a Wide Temperature Range
    Hao Y.L.,Wang H.L.,Li T.,Cairney J.M.,Ceguerra A.V.,Wang Y.D.,Wang Y.,Wang D.,Obbard E.G.,Li S.J.,Yang R.
    J. Mater. Sci. Technol., 2016, 32 (8): 705-709.  DOI: 10.1016/j.jmst.2016.06.017
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    Materials that undergo a reversible change of crystal structure through martensitic transformation (MT) possess unusual functionalities including shape memory, superelasticity, and low/negative thermal expansion. These properties have many advanced applications, such as actuators, sensors, and energy conversion, but are limited typically in a narrow temperature range of tens of Kelvin. Here we report that, by creating a nano-scale concentration modulation via phase separation, the MT can be rendered continuous by an in-situ elastic confinement mechanism. Through a model titanium alloy, we demonstrate that the elastically confined continuous MT has unprecedented properties, such as superelasticity from below 4.2?K to 500?K, fully tunable and stable thermal expansion, from positive, through zero, to negative, from below 4.2?K to 573?K, and high strength-to-modulus ratio across a wide temperature range. The elastic tuning on the MT, together with a significant extension of the crystal stability limit, provides new opportunities to explore advanced materials.

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    Warpage and Shrinkage Optimization of Injection-Molded Plastic Spoon Parts for Biodegradable Polymers Using Taguchi, ANOVA and Artificial Neural Network Methods
    Oliaei Erfan,Shiroud Heidari Behzad,Mohammad Davachi Seyed,Bahrami Mozhgan,Davoodi Saeed,Hejazi Iman,Seyfi Javad
    J. Mater. Sci. Technol., 2016, 32 (8): 710-720.  DOI: 10.1016/j.jmst.2016.05.010
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    In this study, it is attempted to give an insight into the injection processability of three self-prepared polymers from A to Z. This work presents material analysis, injection molding simulation, design of experiments alongside considering all interaction effects of controlling parameters carefully for green biodegradable polymeric systems, including polylactic acid (PLA), polylactic acid-thermoplastic polyurethane (PLA-TPU) and polylactic acid-thermoplastic starch (PLA-TPS). The experiments were carried out using injection molding simulation software Autodesk Moldflow® in order to minimize warpage and volumetric shrinkage for each of the mentioned systems. The analysis was conducted by changing five significant processing parameters, including coolant temperature, packing time, packing pressure, mold temperature and melt temperature. Taguchi's L27 (35) orthogonal array was selected as an efficient method for design of simulations in order to consider the interaction effects of the parameters and reduce spurious simulations. Meanwhile, artificial neural network (ANN) was also used for pattern recognition and optimization through modifying the processing conditions. The Taguchi coupled analysis of variance (ANOVA) and ANN analysis resulted in definition of optimum levels for each factor by two completely different methods. According to the results, melting temperature, coolant temperature and packing time had significant influence on the shrinkage and warpage. The ANN optimal level selection for minimization of shrinkage and/or warpage is in good agreement with ANOVA optimal level selection results. This investigation indicates that PLA-TPU compound exhibits the highest resistance to warpage and shrinkage defects compared to the other studied compounds.

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    Antibacterial Action of Chemically Synthesized and Laser Generated Silver Nanoparticles against Human Pathogenic Bacteria
    Zafar Nosheen,Shamaila Shahzadi,Nazir Jawad,Sharif Rehana,Shahid Rafique Muhammad,Ul-Hasan Jalees,Ammara Syeda,Khalid Hina
    J. Mater. Sci. Technol., 2016, 32 (8): 721-728.  DOI: 10.1016/j.jmst.2016.05.009
    Abstract   HTML   PDF

    Silver nanoparticles in the range of 10-40?nm were synthesized chemically and by laser ablation, employed for in vitro antibacterial action against human pathogenic bacterium. Their formation was evidenced by UV-visible spectrophotometer; particle size confirmed by atomic force microscopy, crystal structure determined by X-ray diffraction and chemical composition investigated by Fourier transform infrared spectroscopy. The calculated MIC (minimum inhibitory concentration) of chemically synthesized nanoparticles with 30-40?nm in size are 2.8?µg/mL, 4.37?µg/mL, 13.5?µg/mL and 2.81?µg/mL for E. coli, S. aureus, B. subtillis and Salmonella, respectively. Whereas laser ablated nanoparticles exhibit MIC of 2.10?µg/mL, 2.36?µg/mL and 2.68?µg/mL for E. coli, S. aureus and Salmonella, respectively.

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    A Green Biocompatible Fabrication of Highly Porous Functional Ceramics with High Strength and Controllable Pore Structures
    Xu Changlu,Liu Haoran,Yang Huilin,Yang Lei
    J. Mater. Sci. Technol., 2016, 32 (8): 729-732.  DOI: 10.1016/j.jmst.2016.07.002
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    A green biocompatible foaming method utilizing natural coconut oil and cornstarch was developed to fabricate highly porous functional ceramics with controllable strengths and pore structures. The porosity of Al2O3 ceramics prepared via this method reached 79.6%-86.9% while these ceramics maintained high compressive strengths of 2.2-5.5?MPa. More importantly, porous Al2O3 ceramic with a pore size gradient was also readily fabricated by casting serial layers of foams that were set for different time periods. The potential applications of porous Al2O3 and HA ceramics fabricated by this green foaming method including scaffolds for oil cleaning and cell culture, respectively, were also demonstrated.

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    Multiple-Sized Amphiphilic Janus Gold Nanoparticles by Ligand Exchange at Toluene/Water Interface
    Luo Kun,Xiang Yongdong,Wang Haiming,Xiang Li,Luo Zhihong
    J. Mater. Sci. Technol., 2016, 32 (8): 733-737.  DOI: 10.1016/j.jmst.2016.06.024
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    Amphiphilic Janus gold nanoparticles (GNPs) are prospected to encapsulate drug molecules in cancer therapy and to serve as heterogeneous catalysts at oil/water interfaces, where Janus GNPs with different sizes are required. In this work, multiple-sized precursor GNPs were synthesized by seeded growth method protected with tris(hydroxymethyl)phosphine oxide (THPO) ligand molecule, and a ligand exchange reaction with triphenylphosphine (PPh3) at the toluene/water interface was employed to prepare amphiphilic Janus GNPs. UV-vis and transmission electron microscopy (TEM) analyses indicate that the as-prepared GNPs are nanocrystals with average diameters of 2.3?nm, 9.5?nm, 16.1?nm and 18.8?nm, respectively. Contact angle, Raman and X-ray photonic spectroscopy (XPS) analyses reveal that the self-assembled GNP films exhibit hydrophilic on one side and hydrophobic on another, owing to the adsorption of hydrophilic ligands (THPO and THP) and a similar amount of hydrophobic ligands (PPh3 and PPh3O). Angle-resolved XPS analysis further demonstrates that the individual GNPs actually possess hydrophilic and hydrophobic compartments on the surface, which regularly packed by supramolecular interactions at toluene/water interface to form the self-assembled GNP films.

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    Preparation of a Crosslinked Chitosan Coated Calcium Sulfate Whisker and Its Reinforcement in Polyvinyl Chloride
    Cui Jiayang,Cai Yangben,Yuan Wenjin,Lv Zhongfei,Xu Shiai
    J. Mater. Sci. Technol., 2016, 32 (8): 745-752.  DOI: 10.1016/j.jmst.2016.06.006
    Abstract   HTML   PDF

    A calcium sulfate whisker (CSW) coated with glutaraldehyde crosslinked chitosan (GACS) was prepared to reinforce polyvinyl chloride (PVC) in this study. The results show that the optimum concentration of both chitosan (CS) and glutaraldehyde (GA) is 0.05?wt%. The tensile strength, impact strength, flexural modulus and vicat softening temperature of the PVC composite with 12?wt% of modified CSW are increased by 17.5%, 40.4%, 0.8% and 3.8% compared with those of the PVC composite with 12?wt% of unmodified CSW, and by 2.9%, 42.4%, 27.1% and 6.8% compared with those of pure PVC, respectively. The dynamic mechanical analysis results indicate that the modified CSW/PVC composite exhibits much higher storage modulus and glass transition temperature than those of unmodified CSW/PVC composite and pure PVC. In addition, the modified CSW/PVC composite also demonstrates good thermal properties with a high rapidest decomposition temperature (Trpd) and char residue. The scanning electron microscopy images of tensile-fractured surfaces show that the modified CSW has a strong interfacial adhesion with PVC matrix.

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    Multifunctional Reduced Graphene Oxide Hydrogel as Drug Carrier for Localized and Synergic Photothermal/Photodynamics/Chemo Therapy
    Chang Guanru,Li Shikuo,Huang Fangzhi,Zhang Xiuzhen,Shen Yuhua,Xie Anjian
    J. Mater. Sci. Technol., 2016, 32 (8): 753-762.  DOI: 10.1016/j.jmst.2016.06.014
    Abstract   HTML   PDF

    To combine localized drug release with multimodal therapy for malignant tumor, a composite hydrogel as an integrative drug delivery system was facilely prepared. The system contains spinach extract (SE), reduced graphene oxide (rGO) and gold nanocages (AuNCs). SE conduces to the formation of hydrogel, and also serves as a green material for improving the biocompatibility of hydrogel, and a natural photosensitizer for killing tumor cells under laser radiation (660?nm). AuNCs show obvious photothermy and can enhance the generation of cytotoxic singlet oxygen (1O2). The composite hydrogel shell on tumor cells exhibits several competitive advantages including enhanced antitumor effect by retaining the high concentration of drugs around cancer cell, excellent PDT/PTT compatibility as well as high loading and controllable release of fluorouracil (5-FU) for synergetic multimodal treatment. The survival rate of HeLa cells incubated with 5-FU loaded hydrogel under NIR radiation for 10?min sharply decreases to 1.2%, indicating remarkably improved antitumor effects. These results demonstrate that the hydrogel is an excellent delivery carrier for localizable, NIR-responsive and combined PTT/PDT/Chemo synergetic antitumor.

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    Synthesis, Characterization and Electrochemical Study of Graphene Oxide-Multi Walled Carbon Nanotube-Manganese Oxide-Polyaniline Electrode as Supercapacitor
    Ghasem Hosseini Mir,Shahryari Elham
    J. Mater. Sci. Technol., 2016, 32 (8): 763-773.  DOI: 10.1016/j.jmst.2016.05.008
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    The synthesis of graphene oxide-multi walled carbon nanotube-manganese oxide-polyaniline namely (GMMP) nanocomposite for application in supercapacitor devices was investigated. Morphology of the nanocomposites was studied by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray microanalysis (EDX). The electrochemical properties of nanocomposite based electrodes were investigated by cyclic voltammetry (CV), galvanostatic charge-discharge and electrochemical impedance spectroscopy (EIS) techniques in 0.5?mol/L Na2SO4. The specific capacitances of 173.00, 127.85, 87.50, 58.65 and 12.00 (mF cm-2) were obtained for GMMP, GMP (GO-MWCNT-PANI), GMM (GO-MWCNT-MnO2), GM (GO-MWCNT) and G (GO) at a scan rate of 10?mV?s-1, respectively. Also, GMMP nanocomposite retained 90% initial capacitance after 200 cycle of charge-discharge. The good electrochemical response of this nanocomposite is due to the combination of the electrical double layer capacitance of GO and MWCNT and the gradual introduction of pseudo-capacitance through the redox processes of PANI, -COOH, -OH (in MWCNT-COOH, GO-COOH and GO-OH) and MnO2. This revealed the synergistic effect of PANI, MnO2, -OH -COOH on the carbon based support.

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    Influence of the Accumulative Roll Bonding Process Severity on the Microstructure and Superplastic Behaviour of 7075 Al Alloy
    Hidalgo-Manrique P.,Orozco-Caballero A.,Cepeda-Jiménez C.M.,Ruano O.A.,Carreño F.
    J. Mater. Sci. Technol., 2016, 32 (8): 774-782.  DOI: 10.1016/j.jmst.2016.06.004
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    The 7075 Al alloy was processed by accumulative roll bonding (ARB) at 350?°C using 2:1, 3:1 and 4:1 thickness reductions per pass (Rp) up to 8, 6 and 3 passes, respectively. Microstructural examinations of the processed samples revealed that ARB leads to a microstructure composed of equiaxed crystallites with a mean size generally lower than 500?nm. It was found that, due to both the stored energy throughout the processing and the particle pinning effect, the alloy is affected by discontinuous recrystallisation during the inter-pass heating stages, the precise microstructural evolution being dependent on Rp. Mechanical testing of the ARBed samples revealed that the main active deformation mechanism in the ARBed samples in the temperature range from 250 to 350?°C at intermediate and high strain rates is grain boundary sliding, the superplastic properties being determined by both the microstructure after ARB and its thermal stability.

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    Enhanced Strength and Ductility Due to Microstructure Refinement and Texture Weakening of the GW102K Alloy by Cyclic Extrusion Compression
    Lin Jinbao,Wang Xinyi,Ren Weijie,Yang Xuexia,Wang Qudong
    J. Mater. Sci. Technol., 2016, 32 (8): 783-789.  DOI: 10.1016/j.jmst.2016.01.004
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    The cyclic extrusion compression (CEC) was applied to severely deform the as-extruded GW102K (Mg-10.0Gd-2.0Y-0.5Zr, wt%) alloy at 350, 400, and 450?°C, respectively. The microstructure, texture, and grain boundary character distribution of the CECed alloy were investigated in the present work. The mechanical properties were measured by uniaxial tension at room temperature. The crack initiation on the longitudinal section near the tensile fracture-surface was investigated by high-resolution scanning electron microscopy (SEM). The result shows that the microstructure was dramatically refined by dynamic recrystallization (DRX). The initial fiber texture was disintegrated and obviously weakened. The 8-passes/350?°C CECed alloy exhibited yield strength of 318?MPa with an elongation-to-fracture of 16.8%, increased by 41.3% and 162.5%, respectively. Moreover, the elongation-to-fracture of the 8-passes/450?°C CECed alloy significantly increased more than 3 times than that of the received alloy. The cracks were mainly initiated at twin boundaries and second phase/matrix interfaces during tensile deformation. The microstructure refinement was considered to result in the dramatically enhanced of the strength and ductility. In addition, the texture randomization during CEC is beneficial for enhancing ductility. The standard positive Hall-Petch relationships have been obtained for the CECed GW102K alloy.

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    Influence of Temperature on Stacking Fault Energy and Creep Mechanism of a Single Crystal Nickel-based Superalloy
    Tian Sugui,Zhu Xinjie,Wu Jing,Yu Huichen,Shu Delong,Qian Benjiang
    J. Mater. Sci. Technol., 2016, 32 (8): 790-798.  DOI: 10.1016/j.jmst.2016.01.020
    Abstract   HTML   PDF

    The influence of temperatures on the stacking fault energies and deformation mechanism of a Re-containing single crystal nickel-based superalloy during creep at elevated temperatures was investigated by means of calculating the stacking fault energy of alloy, measuring creep properties and performing contrast analysis of dislocation configuration. The results show that the alloy at 760?°C possesses lower stacking fault energy, and the stacking fault of alloy increases with increasing temperature. The deformation mechanism of alloy during creep at 760?°C is γ′ phase sheared by <110> super-dislocations, which may be decomposed to form the configuration of Shockley partials plus super-lattice intrinsic stacking fault, while the deformation mechanism of alloy during creep at 1070?°C is the screw or edge super-dislocations shearing into the rafted γ′ phase. But during creep at 760 and 980?°C, some super-dislocations shearing into γ′ phase may cross-slip from the {111} to {100} planes to form the K-W locks with non-plane core structure, which may restrain the dislocations slipping to enhance the creep resistance of alloy at high temperature. The interaction between the Re and other elements may decrease the diffusion rate of atoms to improve the microstructure stability, which is thought to be the main reason why the K-W locks are to be kept in the Re-containing superalloy during creep at 980?°C.

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