Applied Mechanics and Materials Vol. 598

Abstract: The annealed AZ31 magnesium alloy with 400°C and 1.5hour was selected and compressed under different deformation amount. The orientation and microstructure were investigated too. The results shown that the twinning type and amount changed the orientation of new grain after compressed largely. The tension twinning made the orientation deviated form TD to ED in the {10-10} pole figure, but contraction and double twinning mad the orientation concentrated in the TD.

Abstract: The oxidation behavior of Fe-15Cu-10Al alloy was investigated at 700°C. Oxidation kinetics of the alloy conformed nearly to the parabolic rate law. The scales were composed mainly of alumina, plus a few nodules rich in iron. The very low oxidation rate of Fe-15Cu-10Al alloy showed that 10at.% Al level reached the critical Al content to form a complete Al₂O₃ external layer. Compared with the corresponding Fe-10Al binary alloy, the addition of 15at.% Cu played a beneficial role for the establishment of the full protective alumina layer.

Abstract: As one of the important strategic metals, Vanadium is applied widely to various fields, 85% of them are used in steel production. In this paper, the properties and the resource distribution of Vanadium are made a rough introduction, and introduced the present application situation of Vanadium in steel ,on-ferrous metals, alloys, batteries, chemical industry, ect.

Abstract: This paper mainly summarizes the vanadium leaching process from bone coal, steel slag containing vanadium, catalystcontaining vanadium, including their leaching condition , application circs and these materials’ respective merits and faults under production process. bone coal and steel slag containing vanadium are the usual raw materials and the extracting of vanadium are divided into full wet extraction method and roasting-wet extraction method.The later applied more widely. At the same time, give some short introduction of other new method such as selective precipitation ,slurry electrolysis ,microbial leaching and so on.

Abstract: In our work, we aimed to improve the interfacial properties of the Polyetheretherketone (PEEK) polymer/carbon fiber (CF) by treating the fibers with wet chemical method, a higly oxidative chemical solutions called piranha solution and chromate solution. The changes of the surface funtional groups, chemical compositions and structures of the carbon fibers were characterized by X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR),surface morphology was studied by scanning electron microscopy (SEM), mechanical interfacial properties of the composites was evaluated by means of interlaminar shear strength (ILSS) tests. The results indicated that graphitic carbon was the major carbon functional component on the carbon fiber surfaces and other functional groups were also presented, such as C–O, C-OH, C = O. Consequently, these introductions of oxygen functional groups onto the carbon fiber surfaces led to an improvement of the ILSS of the composites.

Abstract: A fiber extracted from King’s crown plant belonging to apoceynaceal family is a budding component identified for potential use in composites. It is imperative to evaluate the parametric and property based features to determine its suitability. This study focuses on evaluating the properties/ behavior of raw fibers and fibers treated with various concentrations of NaOH. Considering the possible application of the fiber composites, the aptness of these fibers are examined with respect to their physical, mechanical, thermal and chemical properties. The outcome of the analysis emphasizes that the fibers treated with NaOH outperforms the raw fibers in terms of its tensile strength. Added to this, the fibers treated with NaOH have maximum cellulose and minimum wax content, thereby exhibiting their superior chemical stability. Further, the thermal analysis clearly indicates that the temperature peak shifts to a higher region in the treated fiber compared to raw fiber.

Abstract: A series of silver films were fabricated on silicon by magnetron sputtering method, which enables us to finely tune silver nanostructures by adjusting sputtering process. We studied the evolutional nanostructures obtained from sputtering time, and investigated their corresponding SERS effects. Results show that nanogroove-structured thin silver films have strongest Raman signal enhancement. This work provides a very fast, simple and reproducible way to fabrication of SERS-active substrate with tunable nanostructures.

Abstract: The polymerization of para-acetoxybenzoic acid (PABA) and poly (ethylene terephthalate) to generate high molecular weight semi-aromatic copolyester was conducted successfully in the presence of acetic anhydride. The influence of acetic anhydride on the copolymerization was studied. The addition of acetic anhydride (2:1 mol AC₂O /PET) in the polymerization system afforded the polymerized copolyester with an increased intrinsic viscosities (by 112.5%) and a decreased amount of insoluble fraction (by 80%). ¹H-NMR analysis indicated that mole ratio of PET repeat unit and PHB was 42:58 with the addition of acetic anhydride, which was quite similar to the theoretical ratio and higher than traditional synthesized PET/PHB. The results show that the addition of acetic anhydride is effective not only in increasing the molecular weight but also in increasing benzene ring content in the copolyester.

Abstract: In order to make better use of lignin, a mixed solution with isopyknic hydrogen peroxide 30% aqueous solution and an ionic liquid 1-butyl-3-methylimidazolium chloride ([BMIm]Cl) was used to oxygenize alkali lignin from black liquor. The pyrolysis behavior of the treated alkali lignin (Regenerated ALG) was investigated via TGA. The kinetic controlling temperature range of the Regenerated ALG pyrolysis is between 533K and 649K approved by TG/DTG/DTA data, and the dominated pyrolysis is occurred below 574.7K, which was calculated from a kinetics model using Coats-Redfern method with a first order pyrolysis reaction. The activation energy of the Regenerated ALG also reached up to 105.675kJ/mol, which is 2.2 times greater than the non-treated one.

Abstract: In this study, in order to explore a suitable method to obtain a better wear resistance and corrosion resistance of austenitic stainless steel, low temperature plasma carburizing technology has been studied. Research on the properties of austenitic stainless steel under different carburizing atmosphere proportion, with hardness, wear resistance and corrosion resistance as the properties characterization. The results shows that C₃H₈:H₂=1:40 have better properties with the hardness of 950 HV_0.05, the friction coefficient of about 0.25, which showed a better wear resistance. And also the corrosion rate of about 20.3g/m²·h showed a better corrosion resistance.