Showing papers in "Transactions of Nonferrous Metals Society of China in 2008"

TL;DR: In this paper, a critical examination was made on the reliability of kinetic parameters of nonisothermal thermoanalytical rate measurement by the widely applied Coats-Redfern(CR) equation.

TL;DR: In this article, the effect of process parameters such as tool rotational speed, traverse speed and axial force on tensile strength of friction stir welded RDE-40 aluminium alloy was evaluated.

TL;DR: In this article, the influence of two novel aging treatments, T6I6 (130 °C, 80 min + 65 °C) and high-temperature pre-precipitation (HTPP) aging, on the tensile properties, intergranular corrosion, exfoliation corrosion behaviors and microstructures of 7075 Al alloy was studied, which were compared with the T6, T73 and RRA treatments.

TL;DR: In this paper, the effect of temperature on tribological properties of surface modified Cu nanoparticles as 50CC oil additive was investigated on a four-ball tester, and the morphologies, typical element distribution and chemical states of the worn surfaces were characterized by SEM, EDS and XPS, respectively.

TL;DR: A review of the current status of commercial biomining operations around the world, identifying factors that drive the selection of biomining as a processing technology, describes challenges to exploiting these innovations, and concludes with a discussion about biomining's future as discussed by the authors.

TL;DR: In this article, the effect of Zn on the microstructure, the mechanical property and the corrosion property in simulated body fluid (SBF) of an extruded Mg-Mn alloy was studied.

TL;DR: The results from laboratory experiments which have simulated both stirred tank and heap bioreactor systems have shown that microbial consortia are more robust than pure cultures of mineraloxidizing acidophiles, and also tend to be more effective at bioleaching and bio-oxidising ores and concentrates as mentioned in this paper.

TL;DR: In this article, the effect of reduction ratio and mismatch ratio on the shear deformation was studied for asymmetric rolling with pure aluminium as a model material and the equivalent strain was calculated.

TL;DR: Biotechnological processes hold great promise in the remediation of acid mine drainage and efficient removal of toxic metal ions such as copper, zinc and arsenic.

TL;DR: In this paper, the impact behavior of aluminum alloy 2519A was investigated at strain rates of 600-7 000 s −1 and temperatures of 20-450 °C by a split Hopkinson pressure bar.

TL;DR: In this article, the microstructure, micro-hardness and wear resistance were investigated using SEM, XRD, Microhardness Tester and Friction and Wear Tester, respectively.

TL;DR: In this paper, the microstructure and the composition of the oxidation scale were studied by using XRD, TEM and EPMA, and the results showed that the combination of Nb and Si can improve the oxidation resistance of the alloys significantly.

TL;DR: In this paper, the contaminated soil area was divided into four zones which were polluted by tailings, mine drainage, dust deposition in wind and spreading minerals during vehicle transportation, respectively.

TL;DR: In this paper, the effects of a pulsed magnetic field on the solidified microstructure of an AZ31 magnesium alloy were investigated, and it was shown that the remarkable microstructural refinement is achieved when the pulsed magnet field is applied to the solidification of the AZ31 alloy.

TL;DR: In this paper, the mass loss of pure Mg, Mg-Zn-Zr and MgZn, Zn, and Zr-Y in simulated body fluid was measured using photovoltaic scale meter.

TL;DR: In this article, the influence of preparation methods on the photoluminescence properties of ZnO film was studied, and two preparation methods were applied to fabricate zinc oxide films in a conventional pulsed laser deposition apparatus.

TL;DR: In this article, the phase transformation in reduction process with microwave heating was investigated by XRD and the reduction degree of iron was analyzed by chemical method, and the results show that the laterite samples mixed with active carbon couple well with microwave and the temperature can reach approximate 1 000 °C in 6.5 min.

TL;DR: In this paper, the reduction degree of Bama ilmenite is enhanced with increasing temperature and the molar ratio of carbon to oxygen, and the reaction rate varies with temperature and reduction time simultaneously.

TL;DR: In this article, the authors investigated the hot deformation behavior of TC11 alloy with β-annealed lamellar structure and forged equiaxed structure in the β field in the temperature range of 1090-1030℃ and strain rate of 0.001-0.1 s^(-1) by means of isothermal compression tests.

TL;DR: In this article, a 50 Hz AC anodizing technique in an alkaline borate solution, which contained a new kind of organic, was used to obtain a good level of corrosion protection for AM60 magnesium alloy.

TL;DR: In this article, a well oriented and uniform titanium oxide nanotube array on the surface of titanium substrate was applied by means of anodic oxidation pre-treatment to improve the bonding strength between HA coating and Ti substrate, and the calcium hydrogen phosphate (CaHPO4·2H2O, DCPD) coating was electrodeposited on the anodized Ti.

TL;DR: In order to obtain fine-microstructure magnesium alloys with superior mechanical properties, AZ61 alloy was processed by friction stir processing (FSP) combined with rapid heat sink as discussed by the authors.

TL;DR: In this paper, a hydrometallurgical process was developed for recovery of nickel and cobalt from the hydrochloric acid leaching solution of alloy scraps, which consists of five major unit operations: 1) leaching with 6 mol/L HCl under the L/S ratio of 10:1 at 95 °C for 3 h, 2) copper replacement by iron scraps under pH value of 2.0 at 80 °C, and stirring for 1 h, 3) removal of iron and chromium by chemical precipitation, 4) selective separation of cobalt with 30

TL;DR: In this paper, the effect of Yb additions on the microstructure and properties of 7A60 aluminum alloys with T6 and T77 aging treatments was investigated by TEM, optical microscopy, hardness and electric conductivity measurement, tensile test and stress corrosion cracking test.

TL;DR: Based on the practice of magnesium production in China, a quantitative evaluation of the environment impact was carried out according to the theory and framework of life cycle assessment (LCA) study as discussed by the authors.

TL;DR: In this article, the authors investigated the bio-leaching of chalcopyrite in shake flasks by using pure acidithiobacillus ferrooxidans and mixed culture isolated from the acid mine drainage in Yushui and Dabaoshan Copper Mine in China.

TL;DR: The influence of strontium(Sr) and rare earth (RE) elements on the corrosion behavior of AZ91D magnesium alloy was investigated by conventional corrosion testing and electrochemical measurements in 3.5% NaCl solution.

TL;DR: Based on the element life and death theory of finite element analysis (FEA), a three-dimensional multi-track and multi-layer model for laser metal deposition shaping (LMDS) was developed with ANSYS parametric design language(APDL), and detailed numerical simulations of temperature and thermal stress were conducted as mentioned in this paper.

TL;DR: In this article, the macro-arc oxidation (MAO) coating on Mg alloy AZ91 was examined by means of nano scratch tester and the results showed that the coating and its substrate are in a pronounced bond.

TL;DR: A 3D elasto-plastic finite element (FE) model of power spinning of thin-walled aluminum alloy shell with hoop inner rib was established under software ABAQUS as mentioned in this paper.