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Materials & Design 51건

  1. [해외논문]   Thermophysical properties of Ni-containing single-phase concentrated solid solution alloys   SCIE

    Jin, K. (Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ) , Mu, S. (Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ) , An, K. (Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ) , Porter, W.D. (Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ) , Samolyuk, G.D. (Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ) , Stocks, G.M. (Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA ) , Bei, H. (Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA)
    Materials & Design v.117 ,pp. 185 - 192 , 2017 , 0264-1275 ,

    초록

    Abstract Temperature dependent thermophysical properties, including specific heat capacity, lattice thermal expansion, thermal diffusivity and conductivity, have been systematically studied in Ni and eight Ni-containing single-phase face-centered-cubic concentrated solid solution alloys, at elevated temperatures up to 1273K. The alloys have similar specific heat values of 0.4–0.5J·g −1 ·K −1 at room temperature, but their temperature dependence varies greatly due to Curie and K-state transitions. The lattice, electronic, and magnetic contributions to the specific heat have been separated based on first-principles methods in NiCo, NiFe, Ni-20Cr and NiCoFeCr. The alloys have similar thermal expansion behavior, with the exception that NiFe and NiCoFe have much lower thermal expansion coefficient in their ferromagnetic state due to magnetostriction effects. Calculations based on the quasi-harmonic approximation accurately predict the temperature dependent lattice parameter of NiCo and NiFe with Highlights Control thermophysical properties of concentrated solid solution alloys by varying compositional complexity. Magnetic state and possible short-range ordering affect the temperature dependence of specific heat in alloys. NiFe and NiCoFe alloys show strong magnetostriction effects at their ferromagnetic state. Cr is a critical alloying elements that dramatically reduces the thermal conductivity of these alloys Graphical abstract [DISPLAY OMISSION]

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  2. [해외논문]   CoCrFeNi(W1−xMox) high-entropy alloy coatings with excellent mechanical properties and corrosion resistance prepared by mechanical alloying and hot pressing sintering   SCIE

    Shang, Caiyun (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, PR China ) , Axinte, Eugen (Faculty of Machine Manufacturing & Industrial Management, Gheorghe Asachi Technical University of Iasi, Romania ) , Sun, Jun (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, PR China ) , Li, Xuting (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, PR China ) , Li, Peng (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, PR China ) , Du, Jianwei (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, PR China ) , Qiao, Pengchao (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, PR China ) , Wang, Yan (School of Materials Science and Engineering, University of Jinan, No. 336, West Road of Nan Xinzhuang, Jinan 250022, P)
    Materials & Design v.117 ,pp. 193 - 202 , 2017 , 0264-1275 ,

    초록

    Abstract The CoCrFeNiW and CoCrFeNiW 0.5 Mo 0.5 high-entropy alloy coatings (HEACs) have been prepared by mechanical alloying and vacuum hot pressing sintering (VHPS) technique on Q235 steel substrate. The microstructures, microhardness, wear resistance and corrosion resistance of HEACs were studied in detail. The final milling products for as-milled CoCrFeNi(W 1−x Mo x ) (x=0, 0.5) coating powders are the mixture of body-centered cubic (BCC) and face-centered cubic (FCC) solid solution phases, while order FCC phase exists for CoCrFeNiW. VHPS-ed CoCrFeNiW and CoCrFeNiW 0.5 Mo 0.5 HEACs are 600 and 650μm in thickness respectively, and bear a good metallurgical bonding to the substrate. Both HEACs comprise two FCC phases with a small amount of δ-NiW and σ-CoCr phases. The average microhardness values of CoCrFeNiW and CoCrFeNiW 0.5 Mo 0.5 HEACs reach 669 and 600HV respectively, which far exceed the substrate (160HV). And both coatings exhibit superior wear resistance than substrate under the same wear conditions. The corrosion resistance in 3.5% NaCl solution of the coatings is improved compared with substrate. Especially, Mo addition remarkably enhances corrosion resistance as reflected by the lowest corrosion current density and more positive corrosion potential as well as a reduction in average corrosion rate. Highlights Mechanically alloyed CoCrFeNi(W 1−x Mo x ) coating powders are mixture of BCC/FCC phases. High-quality HEA coatings (HEACs) were fabricated on Q235 via hot pressing sintering. HEACs exhibit good metallurgical bonding to Q235 and uniformly distributed grains. CoCrFeNiW HEAC has the better HV and wear resistance compared to Mo addition. Corrosion resistance in 3.5% NaCl for HEACs is greatly improved than Q235. Graphical abstract [DISPLAY OMISSION]

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  3. [해외논문]   3D architectures of titania nanotubes and graphene with efficient nanosynergy for supercapacitors   SCIE

    Ponnamma, Deepalekshmi (Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar ) , Vijayan P, Poornima (Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar ) , Al Ali Al-Maadeed, Mariam (Materials Science and Technology Program, Qatar University, P.O. Box 2713, Doha, Qatar)
    Materials & Design v.117 ,pp. 203 - 212 , 2017 , 0264-1275 ,

    초록

    Abstract One dimensional titanium dioxide nanotubes (titania nanotubes or TNT) are grown on the surface of two dimensional graphene sheets by hydrothermal method so that desirable out of plane properties are obtained in the final three dimensional composite structure. The graphene oxide (GO) was first synthesized from the graphite precursor following the improved graphene oxide synthesis method and the metal oxide nanotubes, through hydrothermal method. The morphology analysis of the hybrid nanostructure illustrates the growth of nanotubes of titania on and in between the reduced GO layers and the structural details are investigated by infrared spectroscopy, X-ray photoelectron spectroscopy and Brunauer, Emmett and Teller (BET) surface area measurements. The dielectric properties illustrate the significance of this particular graphene-titania composite in fabricating supercapacitors as it exhibited a dielectric constant of 6.4×10 6 which is about three times more than that of the TNT. The electrochemical experiments in terms of cyclic voltammetry, Nyquist plots and charge discharge measurements further substantiate the applicability of the rationally designed nanostructure in fabricating supercapacitors. Highlights Hydrothermal growth of TiO 2 nanotubes on reduced graphene oxide sheets fabricates supercapacitors. The specific capacitance for the supercapacitor was 324F/g. The strengthened metal oxide-graphene interface ensures 98.5% specific capacitance even after 4500 charge discharge cycles. Graphical abstract [DISPLAY OMISSION]

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  4. [해외논문]   3D printing of large, complex metallic glass structures   SCIE

    Shen, Yiyu (Corresponding author.) , Li, Yingqi , Chen, Chen , Tsai, Hai-Lung
    Materials & Design v.117 ,pp. 213 - 222 , 2017 , 0264-1275 ,

    초록

    Abstract Metallic glasses (MGs) or amorphous alloys although have superior mechanical properties their products are limited to simple geometries such as foils/plates or rods with thin section-thickness due to the requirement of high cooling rates. In this study, 3D, large dimensions of amorphous structures with complex geometry are manufactured by our newly developed Laser Foil Printing (LFP) technology. Zr-based (LM105, provided by Liquidmetal Technologies, Inc.) amorphous foils of 100μm thickness are used as feedstock, and they are laser welded, layer-by-layer, to become 3D amorphous structures. Test results by X-Ray diffraction (XRD), differential scanning calorimetry (DSC), and micro-hardness confirm that the printed structures at selected process parameters achieve the same or better degree of amorphization as the raw foils. A mathematical model was developed to calculate the heating and cooling rates during structure manufacturing which helps the selection of process parameters. This study expands MG products to 3D arbitrary geometries with large dimensions due to the inherited advantages of the LFP technology which would open many potential applications. Highlights A novel additive manufacturing is used to fabricate 3D metallic glass structures. The amorphous structures manufactured cannot be fabricated by any existing method. The as-fabricated parts remain in a fully amorphous phase is confirmed. The structures are constructed by laser welding of amorphous foils layer-by-layer. Graphical abstract [DISPLAY OMISSION]

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  5. [해외논문]   Low temperature superplastic-like deformation and fracture behavior of nano/ultrafine-grained metastable austenitic stainless steel   SCIE

    Sun, G.S. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ) , Du, L.X. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ) , Hu, J. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ) , Xie, H. (The State Key Laboratory of Rolling and Automation Northeastern University, Shenyang 110819, China ) , Misra, R.D.K. (Laboratory for Excellence in Advanced Steel Research, Department of Metallurgical, Materials and Biomedical Engineering, University of Texas at El Paso, 500W. University Avenue, El Paso, TX 79968, USA)
    Materials & Design v.117 ,pp. 223 - 231 , 2017 , 0264-1275 ,

    초록

    Abstract We describe here the low temperature superplastic-like deformation in a nano/ultrafine-grained metasable austenitic stainless steel tensile tested at a strain rate of 2.5×10 −4 s −1 and temperature of 600°C (~0.43 of the absolute melting point). The nano/ultrafine-grained structure was obtained via a combination of cold rolling (~93% in reduction), followed by reversion annealing treatments at 650°C for 10min, 30min, and 700°C for 2min, 5min, respectively, an approach previously adopted by Misra's group (references 11–16). The reversion of martensite to austenite was dominated by diffusional mechanism. The nano/ultrafine-grained steel exhibited superplastic-like behavior with maximum elongation approaching ~153% and strain rate sensitivity of ~0.22. Furthermore, tensile deformation behavior at 20°C and 600°C, and the corresponding fracture characteristics are discussed. Observations of fracture surface indicated that the fracture was characterized by line-up of voids along the striations, when tensile tested at 20°C. Whereas, the fracture surface at 600°C mainly consisted of uniform distribution of dimples. To further study the fracture mechanism during superplastic-like deformation, deformed structures from the longitudinal region close to the tip of the fracture surface were studied. The fracture surface of superplastic-like deformed steel was characterized by interlinkage of cavities. Highlights Nano/ultrafine-grained austenitic stainless steel with average grain size of ~150–300nm was obtained. Superplastic-like behavior of nano/ultrafine-grained austenitic stainless steel was observed at a 600°C (~0.43Tm). Fracture behavior during superplastic-like deformation was attributed to be controlled by interlinkage of cavities. Graphical abstract [DISPLAY OMISSION]

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  6. [해외논문]   Effect of Mn-doping on the structure and electric properties of 0.64Pb(In0.5Nb0.5)O3-0.36PbTiO3 ceramics   SCIE

    Qiao, Huimin (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, China ) , He, Chao (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, China ) , Wang, Zujian (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, China ) , Li, Xiuzhi (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, China ) , Liu, Ying (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian, Fuzhou 350002, China ) , Yang, Xiaoming (Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of) , Tailor, Hamel , Long, Xifa
    Materials & Design v.117 ,pp. 232 - 238 , 2017 , 0264-1275 ,

    초록

    Abstract In order to study the effect of defect dipoles on relaxor-based ferroelectrics, 0.64Pb(In 0.5 Nb 0.5 )O 3 -0.36Pb(Ti 1− x Mn x )O 3 ( x = 0−0.15) ferroelectric ceramics were synthesized using the two-step solid state reaction method. The phase structure, ferroelectric, piezoelectric and dielectric properties were investigated. Upon increasing the Mn content, the phase of the ceramics transforms from tetragonal to rhombohedral symmetry, the magnitude of remnant polarization and piezoelectric coefficient decreasing because of the hardening effect of the defect dipoles and the variation of composition. The coercive field, however, decreases from 22kV/cm to 12.5kV/cm with x ≤0.04 initially owing to a phase transition, and then increasing since the defect dipoles provided a driving and stabilizing force for domain stability. The stabilizing force also resulted in constricted hysteresis loops for samples with composition of x ≥0.04 after aging. The temperature dependence of dielectric properties showed that the Curie temperature decreased from 312°C ( x = 0) to 237°C ( x = 0.15), and the degree of relaxor behavior was enhanced with increase of Mn content. It indicates that the defect dipoles, confirmed by the existence of oxygen vacancies, play an important role in the electrical properties of Mn-doping PIN-PT ceramics. Highlights 0.64Pb(In 0.5 Nb 0.5 )O 3 -0.36Pb(Ti 1− x Mn x )O 3 ( x = 0−0.15) ceramics were synthesized by wolframite method. The phase structure was changed due to the Jahn-Teller distortion of Mn 3+ and decrease of PT content. The constricted hysteresis loops were observed in aged samples because of the intrinsic pinning effect. The coercive field decreased initially owing to phase transition and then increased due to the oxygen vacancies. Graphical abstract [DISPLAY OMISSION]

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  7. [해외논문]   Thermal stability of UV light emitting boron nitride nanowalls   SCIE

    Merenkov, Ivan S. (Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev ave., Novosibirsk 630090, Russia ) , Burovihina, Alena A. (Saint-Petersburg State University, 7-9 Universitetskaya nab., St. Petersburg 199034, Russia ) , Zhukov, Yuri M. (Saint-Petersburg State University, 7-9 Universitetskaya nab., St. Petersburg 199034, Russia ) , Kasatkin, Igor A. (Saint-Petersburg State University, 7-9 Universitetskaya nab., St. Petersburg 199034, Russia ) , Medvedev, Oleg S. (Saint-Petersburg State University, 7-9 Universitetskaya nab., St. Petersburg 199034, Russia ) , Zvereva, Irina A. (Saint-Petersburg State University, 7-9 Universitetskaya nab., St. Petersburg 199034, Russia ) , Kosinova, Marina L. (Nikolaev Institute of Inorganic Chemistry SB RAS, 3 Acad. Lavrentiev ave., Novosibirsk 630090, Russia)
    Materials & Design v.117 ,pp. 239 - 247 , 2017 , 0264-1275 ,

    초록

    Abstract Thermal stability of the boron nitride nanowalls (BNNWs) obtained by plasma-enhanced chemical vapor deposition (PECVD) from borazine (B 3 N 3 H 6 ), in oxidative (air) and inert (argon) atmospheres was studied. The annealing caused the sample surface oxidation with the replacement of nitrogen atoms by oxygen in the hexagonal h-BN structure, which led to a destruction of the layered structure. Strong UV light emission with a broad band ranging from 300 to 500nm at room temperature was detected. Changes in composition, morphology, structure and luminescent properties of the samples before and after annealing in different atmospheres are reported. The BNNWs obtained at 700°C from B 3 N 3 H 6 -NH 3 mixture were stable at the temperatures up to 1100°C and improved their luminescence properties after annealing. Due to high thermal stability and luminescence the present BNNWs may find applications in the optical devices operating at high temperatures. Highlights h-BN nanowalls obtained from B 3 N 3 H 6 -NH 3 were stable in the Ar atmosphere up to 1100°C. A reaction with O 2 in the Ar atmosphere led to forming of oxidized h-BNO nanowalls. Annealing in dry air resulted in degradation and complete evaporation of the samples. Luminescent properties of h-BN nanowalls can be improved by inert annealing at 1100°C. Graphical abstract [DISPLAY OMISSION]

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  8. [해외논문]   Controlling the work hardening of martensite to increase the strength/ductility balance in quenched and partitioned steels   SCIE

    Findley, K.O. (G.S. Ansell Department of Metallurgical and Materials Engineering, Colorado School of Mines, Golden, CO, USA ) , Hidalgo, J. (Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands ) , Huizenga, R.M. (Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands ) , Santofimia, M.J. (Department of Materials Science and Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands)
    Materials & Design v.117 ,pp. 248 - 256 , 2017 , 0264-1275 ,

    초록

    Abstract The role of retained austenite on tensile behavior in quenched and partitioned (Q&P) steels has been studied extensively, but the deformation behavior of martensite, which comprises the majority of Q&P microstructures, has received less attention. In this investigation, martensite properties were varied through heat treatment in a low carbon Q&P steel consisting of retained austenite and martensite. Additional conditions were produced by reheating the Q&P steel to 450°C for 30min or to 700°C followed immediately by quenching. The reheated microstructures contained similar fractions of retained austenite as the non-reheated Q&P microstructures, but reheating tempered the martensite, thereby decreasing martensite dislocation density. The reheated conditions had a lower yield stress and initial work hardening rate than the non-reheated Q&P condition. However, the reheated conditions had a greater work hardening rate at larger strains and greater uniform strain due to less stable retained austenite. Furthermore, the tensile strength of the condition reheated to 450°C was nearly equal to the non-reheated condition. In addition to retained austenite to martensite transformation, the early stage work hardening rate of martensite is critical to ductility and is dependent on martensite dislocation density, which can be decreased through tempering. Highlights Martensite tempering was varied in a quenched and partitioned steel. Work hardening behavior at small strains depends on martensite dislocation density. Tensile ductility is impacted by small strain work hardening rate in Q&P steels. The strength of martensite in Q&P steels is reduced due to carbon partitioning. Graphical abstract [DISPLAY OMISSION]

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  9. [해외논문]   Preparation and characterization of high-temperature resistant ZrC-ZrB2 nanocomposite ceramics derived from single-source precursor   SCIE

    Chen, Shugang (Corresponding author.) , Gou, Yanzi , Wang, Hao , Jian, Ke , Wang, Jun
    Materials & Design v.117 ,pp. 257 - 264 , 2017 , 0264-1275 ,

    초록

    Abstract In order to prepare ZrC-ZrB 2 nanocomposite ceramics with high temperature stability from single-source precursors, the reactions of ZrCl 4 , allyl amine, allyl-MgCl and borane were employed to synthesize suitable precursors. The meliorated ZrNCB precursor had favorable solubility and higher ceramic yield (68.8wt%), which was then transformed to ZrC-ZrB 2 ceramics at different temperatures. The main phase of the ceramics was amorphous at 1000°C. As the temperature increased, the amorphous phases started to crystallize, resulting in the appearance of ZrC and ZrB 2 peaks. The content of ZrC and ZrB 2 phases was relatively high in the nanocomposite ceramics at 1600°C (over 80wt%). The ZrC-ZrB 2 nanocomposite ceramics showed good high temperature stability up to 2000°C. Oxidation test indicated that an oxide layer was formed on the ceramic surface at 1700°C under air to prevent further oxidation of the ceramics. With excellent high temperature and oxidation resistances, the ZrC-ZrB 2 nanocomposite ceramics have potential application for advanced rocket engines and nuclear industry. Highlights Precursors were synthesized by reactions of allyl amine, ZrCl 4 , borane and the Grignard reagent (allyl-MgCl). Ceramization processes of the ZrNCB precursors were analyzed and ZrC-ZrB 2 ceramics were obtained. The obtained nanocomposite ceramics have good high-temperature stability up to 2000°C with dense and nano scaled structure. The ZrC-ZrB 2 ceramics also have excellent stability at 1700°C under air due to the oxidation layer formed on the surface. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  10. [해외논문]   In situ micromechanical testing of tungsten micro-cantilevers using HR-EBSD for the assessment of deformation evolution   SCIE

    Ast, Johannes (Corresponding author.) , Mohanty, Gaurav , Guo, Yi , Michler, Johann , Maeder, Xavier
    Materials & Design v.117 ,pp. 265 - 266 , 2017 , 0264-1275 ,

    초록

    Abstract In situ mechanical testing in combination with direct observation and analysis holds the key to enhanced understanding of deformation mechanisms in materials. Due to its high precision, good spatial resolution and practicality in scanning electron microscopes, electron backscatter diffraction is a powerful technique for probing the surface of crystalline materials. This paper reports in situ micro-cantilever experiments on single crystal tungsten performed inside a scanning electron microscope in combination with high angular resolution electron backscatter diffraction. The evolution of stresses reaching values in the GPa range, as well as the distribution of geometrically necessary dislocations were analysed in the loaded state, revealing the details of deformation behaviour. Graphical abstract [DISPLAY OMISSION]

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