Showing papers in "Transactions of Nonferrous Metals Society of China in 2009"

TL;DR: In this paper, two methods, response surface methodology and artificial neural network, were used to predict the tensile strength of friction stir welded AA7039 aluminium alloy, based on three factors, three-level, and central composite face centered design with full replications technique, and mathematical model was developed.

TL;DR: In this article, the corrosion properties of four kinds of rolled magnesium alloys of AZ31, AZ91, AM60 and ZK60 were studied in 1 mol/L sodium chloride solution.

TL;DR: In this article, the authors investigated the properties of the composites of the natural fiber/poly(lactic acid) (PLA) composites with ramie and jute short fiber as reinforcement and PLA as matrix.

TL;DR: In this article, high-iron-content red mud from Bayer process was employed to recover alumina and ferric oxide by the process of reduction-sintering, leaching and then magnetic beneficiation.

TL;DR: In this paper, the effect of the volume fraction of the SiC particles on the mechanical properties of the composites was studied by both model simulation and experiment, and the results indicate that the yield strength and tensile strength increase, but the elongation decreases with the increase in the volume fractions of the SIC particles, and that the multi-scale model overestimates the normalized elongation due to the ignorance of the pores distributed in the matrix.

TL;DR: In this paper, the effects of shear and normal stresses on the slide and climb motions at the same section of a crystal were analyzed and a new strength theory named as limiting strain energy strength theory (LSEST) was proposed.

TL;DR: In this article, the performance of ultra-fine grained (UFG) industrial Al fabricated by equal channel angular pressing (ECAP) for 16 pass times was investigated by potentiodynamic polarization test, potentiostatic polarization test and electrochemical impedance spectroscopy (EIS) measurement, immersion test and surface analyses.

TL;DR: In this article, the formation of bone-like apatite on the biocomposite surfaces in simulated body fluid (SBF) was analyzed by digital pH meter, plasma emission spectrometer, scanning electron microscope(SEM) and energy dispersive X-ray energy spectrometers(EDX).

TL;DR: In this article, the average concentrations of total chromium in the soil under the slag heap, adjacent to a steel alloy factory and outside the factory were analyzed for chromium contamination level and its effect on soil microorganisms and enzyme activities.

TL;DR: In this paper, the microstructure and mechanical properties of porous titanium were analyzed by a mercury porosimeter, scanning electron microscope(SEM) and compression tester, and the results showed that the content of NaCl influences the porosity significantly.

TL;DR: In this paper, the dynamic recrystallization and texture development, taking place during hot deformation of magnesium alloy AZ31 with a strong wire texture, were studied in compression at 673 K (0.73 Tm).

TL;DR: In this article, a tool for welding was rotated at speeds ranging from 500 to 3 000 r/min under a constant traverse speed of 100 mm/min, and the results showed that at all tool rotation speeds, defect-free welds were successfully obtained.

TL;DR: In this article, a purification process was developed to remove impurity element boron from the metallurgical grade silicon by the electric arc furnace refining, and the thermodynamic equilibria calculation and experiment was performed and analyzed.

TL;DR: In this paper, an attempt was made to improve the surface hardness and wear properties of AISI H13 tool steel through solid solution hardening and refinement of microstructures using a 200 W fiber laser as a heat generating source.

TL;DR: In this article, the effects of voids ( void content, void shape and size) on the interlaminar shear strength of composite laminates were investigated, where voids with void contents in the range of 0.2% to 8.0% were fabricated from carbon/epoxy fabric through varying autoclave pressures.

TL;DR: In this paper, a plasma electrolytic oxidation (PEO) process was carried out to produce ceramic layers on 6061 aluminum substrates in four kinds of electrolytes such as silicate and aluminate solution with and without sodium fluorosilicate.

TL;DR: In this paper, the effect of alloying elements, Ca and Y, on the oxidation behavior of AZ91 magnesium alloy at elevated temperatures was investigated, and the results indicate that the proper addition of Ca can increase the ignition point of AZ 91 alloy greatly.

TL;DR: In this article, the influence of carbide forming element additives on the microstructure and thermal conductivity of diamond composites was investigated and it was found that the composites fabricated with Cu-0.5B alloy coated on diamond is much higher than that of the Cu-1Cr layer.

TL;DR: In this article, optical microscopy (OM) and X-ray diffraction (XRD) techniques were used to study the microstructure and phases of Mg-Sn-Ca alloys, and the corrosion behavior of these alloys was investigated by means of salt spray test and potentio-dynamic measurements.

TL;DR: In this paper, a new adaptive variable stiffness absorber based on a smart material, magnetorheological elastomer (MRE), and its vibration control performance was investigated.

TL;DR: In this article, the phase and microstructure of the alloys that were fabricated using two different casting methods viz. centrifugal casting and high frequency induction casting, were examined using X-ray diffraction analysis, scanning electron microscopy and energy dispersive spectroscopy.

TL;DR: In this paper, the amenability of a refractory ore to the extraction of gold and silver by cyanide leaching was investigated and diagnostic leaching tests were also performed to shed light on the refractive characteristics of ore.

TL;DR: In this article, as-cast Al-Mg-Si-Mn alloys with and without Sc and Zr were investigated by optical microscopy, scanning electronic microscopy(SEM) and energy dispersion spectrum analysis.

TL;DR: In this paper, the effects of mineral processing wastewater on sulfide minerals were investigated by flotation, infrared spectrometry and electrochemistry test, and the results showed that lead-concentrate water can improve the flotation of galena, while the sulfurconcentrates water has negative effect on flotation.

TL;DR: In this paper, the adsorption properties of the four precious metal ions (Ag(I), Au(II), Pd(III) and Pt(IV)) on the commercial Cl − -form 717 strongly basic anion-exchange resin were studied in detail.

TL;DR: In this paper, the dynamic softening behaviors during hot deformation of 7075 aluminum alloy were studied by isothermal hot compression tested at temperatures of 250, 300, 350, 400 and 450 °C and strain rates of 0.01, 0.1, 1 and 10 s −1 on Gleeble1500.

TL;DR: In this paper, the effects of temperature, contact time, initial concentration of metal ions and pH on the biosorption of Cu(Ⅱ) ions were assessed, including change of free energy (G(superscript Θ), enthalpy (H(subscript m), and entropy (S(subscript Θ)).

TL;DR: In this article, the oxidation and hot corrosion behaviors of HVAF-sprayed conventional and nanostructured NiCrC coatings were studied, in the temperature range of 550-750℃ for periods up to 160 h.

TL;DR: In this paper, the role of fluoride ion, the crystallinity of the anodic oxide, and the chemical state of an as-anodized TiO2 nanotubes were investigated.

TL;DR: In this article, nanotubes formed by anodizing a Ti-Zr alloy in H3PO4 electrolyte with a small amount of fluoride ions at room temperature were examined through potentiodynamic test (potential range of I 1 500I2 000 mV) in 0.9% NaCl solution by using potentiostat.