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Composites provide improved combinations of mechanical properties of raw materials. Two novel interpenetrating phase composites (IPCs) have been fabricated by infiltrating unsaturated polyester resin and ZA8 zinc alloy into porous stainless steel fiber preforms, respectively. In this study, Charpy impact tests are conducted to characterize the impact properties. The fractographs are examined to distinguish...
The ozone generation process in the tubular ozonizer powered by high voltage pulses was investigated. The decrease in energy efficiency of the process along discharge gap, i.e. the decrease related with ozone concentration increase, was shown. The effect of power density and gas residence time in the discharge gap on energy efficiency of the process was analyzed. The boundary value of energy efficiency...
The adsorption of ammonia molecules (NH3) on the surfaces of (4,4) boron nitride nanotubes (BNNTs), in presence and absence of applied static electric field (SEF, 0.03-z and 0.04-z) and ionic field (IF) of Be+2, Mg+2, Ca+2, Sr+2 and Ba+2 has been investigated using density functional theory (DFT). The changes in geometric and electronic structures of all adsorption configurations were analyzed to...
In this study, relationship between dynamic compression behavior and microstructure of 6005 aluminum alloy artificially aged at elevated temperatures in the range of 180 °C to 330 °C for 0.5 h was investigated. Dynamic compression response at strain rates from 1200 s−1 to 2700 s−1 was studied using a modified split Hopkinson pressure bar system. It was observed that aging temperature has profound...
Nb2O5/Ag/ZnO multilayer electrodes with excellent optical and electrical properties were deposited by magnetron sputtering at room temperature, where the Ag films were obtained under argon mixed with small amounts of oxygen. The oxygen content could influence the morphology of Ag which plays a crucial role in electrical and optical performance of Nb2O5/Ag/ZnO electrodes. The optimized Nb2O5/Ag/ZnO...
In the present study, a multilayer reflective optical filter consisting of 24 alternate layers of SiO2 and TiO2 was designed and fabricated on BK7 glass substrate using Ion Assisted electron beam Deposition (IAD) technique. The spectroscopic characterization of the filter was carried out in Vis-NIR range with Universal Measurement Accessory (UMA) to measure its optical performance at normal and oblique...
Calcium-magnesium-alumina-silicate (CMAS) attack has been considered as one of the significant failure mechanisms for thermal barrier coatings (TBCs). In this study, CMAS corrosion behavior of Ba2DyAlO5 is investigated at 1300 °C and 1350 °C for 0.5 h, 4 h, 12 h and 24 h. The results indicated that Ba2DyAlO5 had high resistance to CMAS infiltration for prolonged durations (24 h), ascribed to the rapid...
In present work, effect of Nb content on martensitic transformation and damping behavior of (Ti50Ni38Cu12)100-xNbx (x = 0, 5, 10, 15at.%) shape memory alloys was investigated by means of X-ray diffraction, differential scanning calorimetry and dynamic mechanical analysis. As a result, the transformation sequence of TiNiCuNb alloys is found to be B2→B19→B19′ upon cooling. Two different damping peaks...
Present work describes a correlation among microstructure, texture, tensile flow and work hardening behavior of alloy 43Ni-29Fe-18W-10Co in as-cast condition prepared by induction melting technique. The microstructure of the alloy exhibit single fcc (γ) phase along with the characteristic dendritic features. The bulk texture of the as-cast alloy displays the presence of triclinic sample symmetry and...
The effects of Ce addition on the Cu-Mg-Fe alloy hot deformation process were investigated through the isothermal compression tests using the Gleeble-1500D thermo-mechanical simulator at 500–850 °C temperature range and 0.001–10 s−1 strain rate range. The interaction of work hardening, dynamic recovery and dynamic recrystallization during plastic deformation was studied, and the constitutive equations...
Novel elastomer/modified carbon nanotube nanocomposites were prepared by melt mixing ethylene vinyl acetate (EVA) matrix with dye-grafted multiwalled carbon nanotubes (MWCNTs, CNTs in short). The latter were prepared by spontaneous reactions of diazotized Azure A (AA-N2+), Neutral Red (NR-N2+) and Congo Red (CR-N2+) dyes with CNTs in water at RT. The dispersion of the dye-modified CNTs was facilitated...
NiC/Ti and Ni/Ti multilayer samples were fabricated by direct-current (DC) magnetron sputtering technique for investigating the effects of C atoms on their microstructure, interfaces and composition. Both multilayers consist of 10-nm-thickness Ti layers and 8.5-nm-thickness Ni or NiC layers, respectively. Grazing incidence X-ray reflectivity (GIXR) was performed to characterize the layer thicknesses...
Platinum decorated heterogeneous catalysts for methanol oxidation reaction have crucial importance for the commercial sustainability of Direct Methanol Fuel Cells (DMFC). In this study, TiO2/ZnO/Pt nanocomposite film was fabricated as a promising electrocatalytic surface to enhance methanol oxidation in alkaline medium. Firstly, an TiO2/ZnO layer was prepared via DC sputtering followed by electrodeposition...
In the present study, hybrid composites consisting of a hypoeutectic aluminum-silicon (Al-Si) matrix with silicon carbide (SiCp) (10 wt%) and various reduced graphene oxide (RGO) (0.3–0.7 wt%) contents were fabricated using a combined solution-mixing and powder metallurgy (PM) route. The tribological behaviors of these composites against a GCr15 steel ball were studied under dry sliding-wear conditions...
This paper presents an investigation of design and development of low elastic modulus porous biodegradable Mg-Zn-Mn-HA composite for orthopedic applications via mechanical alloying and spark plasma sintering (MA-SPS) technique. The effect of MA-SPS process parameters like milling time, sintering temperature and sintering pressure have been studied on the structural porosity, elastic modulus and hardness...
The luminescence characteristics of Eu3+ doped Y2O3 in the presence and absence of Bi3+/Ga3+ trace ions prepared by the sol-gel combustion method were investigated. The results revealed that, the Bi3+ and Ga3+ ions have a significant influence on the excitation position and emission bands intensity of Eu3+ doped Y2O3. The cathodoluminescence (CL) intensity of the Y2O3:Eu3+ incorporated with Bi3+/Ga...
The structural evolution from the (inter)metallic to the oxide-stoichiometric regime within oxygen-gradient Al0.25Cr0.75-based coatings was investigated by transmission electron microscopy (TEM). Grain refinement of the (inter)metallic Cr(Al) structure — induced by the addition of oxygen to the growth process — is less significant than for the higher Al-containing Al0.50Cr0.50-based coatings. Our...
In the current research, nanoclay particles modified carbon paste surface employed to determine sunset yellow (SY), a well-known azo food dye in nano level. With several astonishing characteristics such as strong adsorption, large surface area, and simple surface modification, the modifier grabbed some interest. The surface features of the modifier were premeditated by SEM (Scanning electronic microscopy)...
The goal of this paper was to investigate the structural/mechanical properties of arc-ion-plated Ti film deposited at ultralow temperature (166 K, LT-Ti film) and its effect as an interlayer on the wear resistance of sputtered WS2 film. The results revealed that the LT-Ti film mainly exhibited ω-phase structure due to the insufficient mobility of Ti adatoms at LT surface, while the α-phase was predominated...
The effect of intercritical annealing on the microstructure and mechanical properties of a low carbon steel with the chemical composition (wt%) of 0.12C–1.11Mn-0.16Si is studied. The cold rolled martensite and ferrite-pearlite microstructure are considered as the starting microstructures for producing dual phase (DP) steels. It is revealed that intercritical annealing of cold-rolled martensite is...
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