Xiong H.,Central South University |
Yu K.,Central South University |
Wen L.,Central South University |
Yao S.,CAS Zhengzhou Research Institute |
And 3 more authors.
Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science | Year: 2016
A new process is developed to obtain high-quality AA1235 aluminum foil stocks and to replace the traditional manufacture process. During the new manufacture process, AA1235 aluminum sheets are twin-roll casted directly through electrolytic aluminum melt (EAM), and subsequently the sheets are processed into aluminum foil stocks by cold rolling and annealing. Microstructure and mechanical properties of the AA1235 aluminum sheets produced through such new process are investigated in each state by optimal microscope, scanning electron microscopy, X-ray diffraction, orientation imaging microscopy, transmission electron microscopy, etc. The results show that compared with the traditional AA1235 aluminum foil stocks produced through re-melted aluminum melt (RAM), the amount of impurities is decreased in the EAM aluminum foil stocks. The EAM aluminum foil stock obtains less β-FeSiAl5 phases, but more α-Fe2SiAl8 phases. The elongation of EAM aluminum foil stocks is improved significantly owing to more cubic orientation. Especially, the elongation value of the EAM aluminum foil stocks is approximately 25 pct higher than that of the RAM aluminum foil stocks. As a result, the EAM aluminum foil stocks are at an advantage in increasing the processing performance for the aluminum foils during subsequent processes. © 2015, The Minerals, Metals & Materials Society and ASM International.
Luo X.-X.,Northeastern University China |
Luo X.-X.,Chinalco Ruimin Co. |
Cui J.-Z.,Northeastern University China |
Hiromi N.,Beijing Institute of Technology |
Chen D.-D.,Beijing Institute of Technology
Zhuzao/Foundry | Year: 2014
Inclusions in molten aluminum significantly influence the subsequent deformation processes and the properties of products. The morphology, origin and removal technology for common inclusions such as oxide, nitride, chloride and the residue of refiner, etc., in molten aluminum are introduced in this paper. The inclusion removing method which applicable for industry production is discussed, and testing methods, the research development and developing process are reviewed and forecasted.
He L.-Z.,Northeastern University China |
Li X.-H.,Chinalco Ruimin Co. |
Wang X.-J.,Northeastern University China |
Zhang H.-T.,Northeastern University China |
Cui J.-Z.,Northeastern University China
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2010
The overburning behavior and microstructure and mechanical properties of low frequency electromagnetic cast 5083(Er) aluminium alloy homogenized at different temperatures were investigated by means of DSC analysis, conductivity measurement, tensile test, OM, XRD, TEM, SEM and EDS. The results show that with increasing homogenizing temperature, the ultimate tensile strength increases and reaches a maximum value at 510°C and then decreases slightly, the conductivity increases and reaches a maximum value at 490°C and keeps it till 520°C, while decreases significantly at 540°C. The incipient melting temperature of the 5083(Er) alloy is 540°C determined by microstructural observations, DSC analysis and conductivity measurement. Plenty of MnAl6/FeMnAl6 rods with size of 100-700 μm are observed when homogenizing temperature is lower than 470°C. Many extremely fine ErAl3 particles with size of 5-20 nm preferentially precipitate along dislocations in the sample homogenized at 490°C. The amount of MnAl6/FeMnAl6 rod and ErAl3 particles increases significantly when homogenizing temperature is 510°C, and then decreases due to coarsening of the phases with increasing homogenizing temperature.
Li D.,Northeastern University China |
Song W.X.,Huixian City Electrical Power Bureau |
Zhang C.J.,Chinalco Ruimin Co. |
Liu J.C.,Northeastern University China |
And 4 more authors.
Materials Science Forum | Year: 2014
The problem of roll eccentricity has become one of important factors to affect the quality of strips as downstream industries require improvement of the strip quality. Reducing thickness control precision as little as possible is incompatible with restraining roll eccentricity perturbations on the requirement of the deadband size for the deadband drift method (DDM) with fixed deadband width. Therefore, the GM-AGC system in hot finishing mill of an aluminum plant uses the dynamic deadband eccentricity filter (DDEF) whose deadband width varies with the amplitude of the roll eccentricity signal. The operating principle of DDEF was introduced according to the characteristic of roll eccentricity signal. Based on the theory of DDEF, simulation was carried out. Comparing with DDM, the simulation result shows that DDEF can keep a balance between less lowering thickness control precision and restraining roll eccentricity perturbations on the requirement of the deadband size. Moreover, the deadband width of DDEF is capable to fit the variations in the frequency and amplitude of the synthetic roll eccentricity signal to restrain the misoperation of GM-AGC system. © (2014) Trans Tech Publications, Switzerland.
Zhu Y.Z.,Wuhan University of Science and Technology |
Huang R.Y.,Chinalco Ruimin Co. |
Zhu Z.,Wuhan University of Science and Technology |
Xiang Z.D.,Wuhan University of Science and Technology
Materials Science and Technology | Year: 2011
Twin roll casting is an attractive technology for producing aluminium sheets for foils. But, surface defects, such as matte defects, may occur on aluminium foils produced in this way. However, it is not the case on aluminium foils produced by traditional hot rolled process. Optical microscopy, scanning electronic microscopy, energy spectrum and transmission electronic microscopy were used to investigate the effects of the microstructures of the twin roll cast and hot rolled aluminium alloy sheet for foils on the surface defects of the foils produced. It is discovered that central segregation band and surface microsegregation band in twin roll casting aluminium sheet may result in a non-uniformly distributed secondary Al-Fe and Al-Fe-Si particles in workpieces in a lower reduction pass. These non-uniformly distributed Al-Fe and Al-Fe-Si particles and microporosities in a size of several microns generated in solidification process of twin roll casting are the main cause for the surface matte defects of the aluminium foils produced. © 2011 Institute of Materials, Minerals and Mining.