The compatibilities of polymer blends, Polypropylene(PP) and Polyamide12(PA12), was simulated by molecular dynamics(MD) simulations. Density, cohesive energy density (CED),and solubility parameters(δ) of pure substan...
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The mesoscale simulation of polymer blends, Polypropylene (PP) and Polyamide12 (PA12), was calculated by Mesoscopic Dynamic method(MesoDyn). The free energy density, the order parameters and the density profiles were ...
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In this work, we use Mesoscopic Dynamic (MesoDyn) density function simulation to study the compatibility of polymer blends. The mesoscale model for Poly (methyl methacrylate) (PMMA) and Poly (ethylene oxide) (PEO) wer...
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We use advanced first principles calculation based on density functional theory to reveal the electrical structure and elastic property of bcc Fe-Mn-C alloys. Results indicate that the solid solution of interstitial C...
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One of the fundamental requirements in the phases of design and manufacture of any welded product is the reduction of residual stresses and strains. These stresses and strains can cause substantial changes in the geom...
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Buckling of thin walled welded structures is one of the most common failure modes experienced by these structures in-service. The study of such buckling, to date, has been concentrated on experimental tests, empirical...
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＜正＞Cubic（3C）-SiC films were grown on Si（100）substrate by chemical vapor deposition（CVD）.Silicon carbide（Si C）is a wide gap semiconductor *** the high temperature,it still maintains the low intrinsic carrier...
＜正＞Cubic（3C）-SiC films were grown on Si（100）substrate by chemical vapor deposition（CVD）.Silicon carbide（Si C）is a wide gap semiconductor *** the high temperature,it still maintains the low intrinsic carrier concentration,high break down electric field,high saturated electron drift velocity,high
Commercially pure nickel (Ni) was thermomechanically processed to promote an increase in Σ3 special grain boundaries. engineering the character and chemistry of Σ3 grain boundaries in polycrystalline materials can h...
Commercially pure nickel (Ni) was thermomechanically processed to promote an increase in Σ3 special grain boundaries. engineering the character and chemistry of Σ3 grain boundaries in polycrystalline materials can help in improving physical, chemical, and mechanical properties leading to improved performance. Type-specific grain boundaries (special and random) were characterized using electron backscatter diffraction and the segregation behavior of elements such as Si, Al, C, O, P, Cr, Mg, Mn, B, and Fe, at the atomic level, was studied as a function of grain boundary character using atom probe tomography. These results showed that the random grain boundaries were enriched with impurities to include metal oxides, while Σ3 special grain boundaries showed little to no impurities at the grain boundaries. In addition, the influence of annealing time on the concentration of segregants on random grain boundaries was analyzed and showed clear evidence of increased concentration of segregants as annealing time was increased.
This paper presents the results of structural investigations and results of tribological and microhardness tests of the coating obtained by electron beam cladding of a Ni-Cr-Si-Fe-B self-fluxing alloy on low-carbon st...
This paper presents the results of structural investigations and results of tribological and microhardness tests of the coating obtained by electron beam cladding of a Ni-Cr-Si-Fe-B self-fluxing alloy on low-carbon steel. After electron beam treatment high-quality dense layer with a thickness of 1.2-1.8 mm was obtained. The structure of the coating consisted of dendrite crystals based on y-Ni-solid solution and eutectic with complex composition. Microhardness of the coating achieves 370 HV. Wear-resistance of the coating obtained by electron-beam cladding technique was 1.6-fold higher than that of low-carbon carburized steel.
Heat treatments of the HVOF sprayed chromium oxide coating were performed in chamber electric furnace. Effects of heat treatment temperature on dry tribological properties and wear mechanism of the coating were studie...
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Heat treatments of the HVOF sprayed chromium oxide coating were performed in chamber electric furnace. Effects of heat treatment temperature on dry tribological properties and wear mechanism of the coating were studied by microhardness testing machine, scanning electron microcopy (SEM), energy-dispersive spectroscopy (EDS) and friction wear testing machine. Results indicate that comprehensive wear & friction resistance of the coating after heat treatment at 500°C were the best under the experimental condition in this paper. Heat treatment doesn't alter wear mechanism of the coating. The main wear mechanisms of the coating were abrasive wear and slight spalling at 10 N load, but at 25 N load, spalling was the main wear mechanism and abrasive wear also exist.
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