Applied Mechanics and Materials Vol. 618

Abstract: The thermodynamic and thermo-elastic properties of ductility intermetallic compounds DyCu with B2 structure are investigated with molecular dynamics. The calculated structure properties are in reasonable agreement with the available experimental and previous calculated data. At the whole range 0-900K, the elastic constants decrease with increasing temperature, and satisfy the stability criterions for DyCu compound. The value of B/G ratio for DyCu is greater than 1.75 implying the DyCu intermetallics are ductile, and increases with elevating temperature. Our results mean that the ductility of DyCu can be improved by increasing temperature.

Abstract: The modified resins, as antibacterial coating materials, have attracted wide attention. Two steps to obtain resins: cuprous oxide collosol particle was prepared by reduction of Copper acetate solution, using hydrazine as the reducing agent, then oleic acid was added to the system as the covered agent; silicone and cuprous modified acrylic resin was successfully synthesized by solution polymerization with the monomers of acrylic acid (AA), butyl acrylate (BA), methyl methacrylate (MMA), vinyl triethoxy silane (VTES) and the as-prepared oleic acid coated Cu₂O sol, using the azobisisobutyronitrile (AIBN) as the initiator. The samples were characterized by X-ray Photoelectron Spectroscopy (XPS) and FTIR analysis. The effects of silicone content on the properties of polymer coatings were investigated by contact angle analysis.

Abstract: For the bulk amorphous Fe_24+xCo_24-xCr₁₅Mo₁₄C₁₅B₆Y₂(X=0, 2, 4, 6 and 17) alloy, the corresponding corrosion properties associated with glass forming ability (GFA) have been carried out. Neutral salt spray corrosion test results show that the Fe₂₈Co₂₀Cr₁₅Mo₁₄C₁₅B₆Y₂ alloy has the minimum corrosion rate, followed by Fe₂₆Co₂₂Cr₁₅Mo₁₄C₁₅B₆Y₂, Fe₂₄Co₂₄Cr₁₅Mo₁₄C₁₅B₆Y₂, Fe₃₀Co₁₈Cr₁₅Mo₁₄C₁₅B₆Y₂, Fe₄₁Co₇Cr₁₅Mo₁₄C₁₅B₆Y₂ and Ti6Al4V alloys. Specifically, the Fe₂₈Co₂₀Cr₁₅Mo₁₄C₁₅B₆Y₂ alloy with the highest GFA also has the best corrosion resistance. With the increasing of Co addition, the corrosion resistance of the FeCo-based bulk metallic glasses is first increases and then decreases, which has the same trend of GFA with the change of Co elements. Furthermore, corrosion morphology are different for FeCo-based BMGs with different Co content.

Abstract: At present, our country norms on the permeability of concrete is mainly determined by its strength, without considering the influence of admixtures on the permeability. This paper studies the permeability of different strength concrete rules of different kinds and dosage of admixture. The results show that, the permeability of concrete is closely related to the w/b, but also it has a strong correlation with admixture dosage, the relevance between the permeability of concrete and the kinds of admixture is relatively small. The results of this paper can provide some reference value to the relevant standards of durability in our country.

Abstract: High temperature low cycle fatigue properties and fracture behavior of Inconel 625 nickel-base superalloy welding joint at 760^oC were investigated under fully reversed total strain-controlled mode. The fatigue life and cyclic stress-strain data were analyzed to determine the individual strain fatigue parameters. It is noted that the welding joint exhibits the cyclic strain hardening and stability. The fatigue cracks initiate predominantly on the free surface of fatigue specimens and propagate in an intergranular mode or a mixed transgranular and intergranular mode.

Abstract: As microfluidic systems transition from research tools to disposable clinical devices, new substrate materials are need to meet both the regulatory requirement as well as the economics of disposable devices. In this paper, a commercial ultraviolet (UV)-curiable material (bisphenol A based epoxy acrylate, BABEA) was introduced as a new manufacturing material for facile fabrication of epoxy-functionalized microfluidic devices by UV-initiated copolymerization. X-ray photoelectron spectroscope (XPS) results indicated the existence of epoxy groups on the surface of poly (BABEA-co-GMA), which allowed for binding protein through an epoxy-amino group reaction. Poly (BABEA-co-GMA) is highly transparent in visible range, and of high replication fidelity. A fabrication procedure was proposed for manufacturing BABEA based epoxy-functionalized micro-zone plates. The fabrication procedure was very simple; obviating the need of micromachining equipments, wet etching or imprinting techniques. To evaluate the BABEA based epoxy-functionalized micro-zone plates, α-fetoprotein (AFP) antibody was immobilized onto the capture zone for chemiluminescent (CL) detection in a non-competitive immune response format. The proposed AFP immunoaffinity micro-zone plate was demonstrated as a low cost, flexible, homogeneous and stable assay for AFP.

Abstract: Oil absorbing foam as a new type of the oil absorbing material, its oil absorptive property had a very important researching value in oil spill emergency disposal and the treatment of oily wastewater in daily life and laboratory. Polyurethane foam was used as a basal body material and silicone was used as modifier for the surface-modification to an excellent new kind of polyurethane flexible foam. This kind of foam has the quality of high oil-absorbing and low water-absorbing, by changing the potency of silicone and the amount of polyurethane to get the best treatment plan. The results show that the absorption of per gram of this new kind of foam is 16.89g edible oil, 24.86g diesel oil or 26.89g gasoline.

Abstract: This paper represents the results of researching of recycling plastic wastes by hydrogenation in the presence of catalysts: natural zeolite, bauxite, red sludge (wastes from recycling of bauxite), as a hydrogen source was used heavy residues from oil process. This method allowed to define the optimal conditions of the hydrogenation process and get liquid products enriched with isoalkanes, cycloalkanes, aromatic and heteroaromatic hydrocarbons.

Abstract: The history of GLARE laminate was introduced. Through comparison with conventional aluminum alloy sheets, the excellent performance of GLARE as a new generation aeronautic material is discussed. The properties and application of GLARE in large civil aircraft indicates that new composite materials such as GLARE will replace bulk aluminum alloy in future aircraft structure. With the continuous development of material technologies, a trend of developing high strength and low cost composite materials will lead aviation industry to a new stage.

Abstract: Complex microstructures can be fabricated on nickel template directly by femtosecond laser. But the efficiency is low and much time is inevitable when large scale microstructures are fabricated. The multi-beam interference provides an effective method for fabrication of large scale microstructures. This paper mainly focuses on direct ablation of nickel template by four-beam interference and fabricating periodic microstructures by laser interference lithography. Experimental results show that submicron periodic stripes and column structures can be produced on the nickel template by laser interference, laying the foundation of making nickel molds for microfluidic chips.