Shandong Nanshan Aluminium Co.

Nanshan, China

Shandong Nanshan Aluminium Co.

Nanshan, China
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Hou L.-G.,University of Science and Technology Beijing | Zhao F.,Shandong Nanshan Aluminium Co. | Zhuang L.-Z.,University of Science and Technology Beijing | Zhang J.-S.,University of Science and Technology Beijing
Gongcheng Kexue Xuebao/Chinese Journal of Engineering | Year: 2017

For enhancing the corrosion resistance of the T6-aged high-strength Al alloys with higher strength, retrogression and re-aging (RRA) treatments were used to optimize the morphologies, sizes, distribution of precipitates, especially grain boundary precipitates (GBPs). The effects of different retrogression treatments on the microstructures and mechanical properties were studied so as to gain suitable RRA process for 7B50 Al alloy plates. It is found that increasing the retrogression temperature or time will promote the coarsening of transgranular and intergranular precipitates in the center and surface layers of 7B50 Al alloy plates as well as the precipitation of stable η-MgZn2 phase, which will decrease the strength and raise the conductivity. The retrogression temperature will greatly affect the strength and conductivity. The continuously distributed GBPs induced by T6 aging become discontinuous after RRA treatment, accompanying with slightly increasing sizes of transgranular precipitates. Based on the strength and conductivity of the center and surface layers, 165℃/6 h is the suitable retrogression process for 7B50 Al alloy plates. However, the severe deformation of the surface grains compared to that of the central grains caused by hot rolling leads to a higher content of subgrains or substructures in the surficial grains, which promotes the surface layer to quickly reach the peak aging, and the subsequent retrogression treatment results in much more stable η phase in the surface layer. The formation of stable η phase as well as the coarsening or growth of transgranular precipitates could be mainly responsible for the strength difference between the surface and center layers. Although there are some differences about the grain structures between the surface and center layers after quenching/RRA treatments with some local subgrain growth, the positive impact of RRA treatment to the strength is apparently unable to compare with the obvious strength reduction caused by early precipitation of stable η phase in the surface layer. Thus, the RRA treatment cannot relieve the property difference between the center and surface layers of 7B50 Al alloy plates, but it can make the strength and conductivity of the center and surface layers to concurrently meet some working requirements. © All right reserved.


Lu F.,Shandong Nanshan Aluminium Co. | Lu F.,Aerospace Research Institute of Materials And Processing Technology | Lu F.,Central South University | Zhao F.,Shandong Nanshan Aluminium Co. | And 7 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2017

Microstructure, tensile property and fracture toughness of 7050 aluminum alloy plates with different thickness were investigated by means of optical microscopy, scanning electron microscopy, tensile and compact tension tests. The results show that, the coarse second phase particles are mainly Al7Cu2Fe and Al2CuMg and the microstructure is partially recrystallized. From the surface to the center along thickness direction, the amount of second phase particles and size increase, the distribution becomes more densely, but the recrystallization fraction reduces. With the plate thickness increases, the amount and size of second phase rise, recrystallization fraction decreases, but the size of recrystallized grains and sub-grains increase. So, the strength and fracture toughness of the plate decrease along the thickness direction from the surface to the center. Besides, the strength and fracture toughness of the plate show a certain anisotropy, the strength in rolling (L) direction is higher than that in the long transverse (LT) direction and the short transverse (ST) direction, and the fracture toughness in the L-T orientation is higher than that in the T-L and S-L orientations at the same thickness. With the thickness rises, the strength and fracture toughness decrease and the property anisotropy increases in different directions. So the higher the thickness of the plate, the more difficult to obtain homogeneous microstructure and properties. © 2017, Editorial Office of "Jinshu Rechuli". All right reserved.


Zhao F.,Shandong Nanshan Aluminium Co. | Zhao F.,Aerospace Research Institute of Materials And Processing Technology | Lu F.,Shandong Nanshan Aluminium Co. | Lu F.,Aerospace Research Institute of Materials And Processing Technology | And 5 more authors.
Journal of the Chinese Society of Corrosion and Protection | Year: 2015

The microstructure characteristics, exfoliation corrosion behavior of 7050-T7451Al-alloy plates were examined by optical microscopy, scanning electron microscopy and Image Pro Plus. The effect of the distribution of grain boundary precipitates, the fraction of recrystallized grains and the length-width ratio of grains on the exfoliation corrosion behavior was investigated. The results indicate that the microstructures of the 7050-T7451 plates fabricated by different processes are composed of recrystallized grains and non-recrystallized grains with precipitates distributed discontinuously along grain boundaries; but which varied corresponding to the relevant fabrication processes. The average length-width ratio of grains plays an important role in the exfoliation corrosion process of the plate, while the influence of the discontinuity of precipitates distribution and the fraction of recrystallized grains is weak. When the precipitates distribute discontinuously along grain boundaries and the average length-width ratio of grains is less than 5, the EXCO resistance of 7050-T7451 plate can reach EA degree or better. © 2015, Chinese Society of Corrosion and Protection. All rights reserved.


Zhao F.,Shandong Nanshan Aluminium Co. | Zhao F.,Aerospace Research Institute of Materials And Processing Technology | Lu F.,Shandong Nanshan Aluminium Co. | Lu F.,Aerospace Research Institute of Materials And Processing Technology | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2015

Effects of two-step aging on microstructures and properties of 7050 aluminum alloy were investigated by transmission electron microscopy, hardness test, tensile test and conductivity test. The results show that strengthening precipitates of the 7050 alloy after 120 ℃×24 h aging are mainly GP zone, with little η' phase. And then through the secondary aging at 163 ℃ for 15 h and 27 h, the corresponding precipitates in the matrix are η'+η phases and coarse η phase. With the prolonger secondary aging time, the strength of the 7050 alloy decreases, while the electrical conductivity increases, and the rate goes up at the same time. When the aging process is 120 ℃×24 h+163 ℃×(15-24) h, the electrical conductivity of the 7050 alloy is higher than 38 %IACS, and the tensile strength and yield strength are not lower than 554 MPa and 508 MPa, respectively, which can achieve a preferable comprehensive properties. © 2015, Chinese Mechanical Engineering Society of Heat Treatment. All right reserved.


Luo X.-D.,Shandong Nanshan Aluminium Co. | Luo X.-D.,Aerospace Research Institute of Materials And Processing Technology | Tang C.-T.,Shandong Nanshan Aluminium Co. | Ma J.-C.,Shandong Nanshan Aluminium Co. | And 5 more authors.
Zhuzao/Foundry | Year: 2015

Harmful effect of ferrum and silicon in aluminium and aluminium alloys was introduced briefly. Technology condition and production management in processes of alumina, carbon anode and primary aluminium, smelting and casting were discussed. It is pointed out that effective measures in metallurgical and casting process would reduce content of ferrum and silicon, and provide good conditions for high-quality production of aluminium and aluminium alloys. ©, 2015, Chinese Mechanical Engineering Society. All right reserved.


Zhao F.,Shandong Nanshan Aluminium Co. | Zhao F.,Aerospace Research Institute of Materials And Processing Technology | Lu F.-Y.,Shandong Nanshan Aluminium Co. | Lu F.-Y.,Aerospace Research Institute of Materials And Processing Technology | And 2 more authors.
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2015

Two kinds of 7050-T7451 aluminum alloy plate with the thickness of 61mm fabricated by two companies were investigated by optical microscope, scanning electron microscopy (SEM), room temperature tensile, fracture toughness and exfoliation corrosion tests, and the relations among the processing, microstructure and properties were discussed. The analysis results indicate that the comprehensive properties of both kinds of plates meet the requirements of AMS 4050H, but the strength and fracture toughness of one kind of plate are lower compared with the other, and the exfoliation corrosion performance is little higher. The property difference between these two kinds of plates comes from the better control of each process, which obtains more homogeneous microstructure along the thickness, lower recrystallization fraction, few residual Al7Cu2Fe particles with smaller size and uniform distribution and few Al2CuMg particles. ©, 2015, Chinese Journal of Aeronautics. All right reserved.


Lu F.-Y.,Shandong Nanshan Aluminium Co Ltd | Lu F.-Y.,Aerospace Research Institute of Materials And Processing Technology | Zhao F.,Shandong Nanshan Aluminium Co Ltd | Zhao F.,Aerospace Research Institute of Materials And Processing Technology | And 6 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2015

Microstructure and phase evolution of 7050 aluminum alloy during homogenizing treatments were investigated by means of optical microscope (OM), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results show that the microstructure of 7050 alloy ingot is typical cellular dendrites with some isolated Al7Cu2Fe particles, in which the lamellar eutectic structure is composed of α(Al) and T-phase (AlZnMgCu). During the homogenization above 460℃, the eutectic structure is decomposed and the T-phase is transformed into the S-phase. The S phase is further dissolved into the matrix at temperatures above 480℃. However, the Al7Cu2Fe particles almost remain in both the size and morphology. With increasing homogenization time and temperature, the transformation of T-phase into S-phase is completed, and the S phase (Al2CuMg) is further dissolved into the matrix with trivial amount left. For the cast 7050 alloy ingot, 460℃×24 h+480℃×8 h is the proper homogenization process in order to alleviate the eutectic microstructure and the amount of S-phases with evenly distributed alloying elements. ©, 2015, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved.


Zhao Y.-Q.,Shandong Nanshan Aluminium Co. | Zhao Y.-Q.,Aerospace Research Institute of Materials And Processing Technology | Li Y.,Shandong Nanshan Aluminium Co. | Li Y.,Aerospace Research Institute of Materials And Processing Technology | And 7 more authors.
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2015

The flow stress behavior and the deformation microstructure of 7150 aluminum alloy during hot compression deformation were studied by thermal simulation test using Gleeble thermal simulation machine at temperature ranging from 300℃ to 450℃ and strain-rate from 0.01s-1 to 10s-1. The constitutive equation of the plastic deformation of 7150 alloy at elevated temperature was obtained by introducing Zener-Hollomon parameter. The experimental results indicate that the flow stress and peak stress increase with increasing strain rate, and decrease with increasing deformation temperature, which can be described by a constitutive equation in hyperbolic sine function, whose values of related parameters A, α, n and activation energy for hot deformation Q, are 4.161×1014 s-1, 0.01956 MPa-1, 5.14336 and 229.7531kJ/mol respectively. With increasing the temperature and decreasing the strain rate, the main soften mechanism of the 7150 alloy transforms from dynamic recovery to dynamic re-crystallization. ©, 2015, Chinese Journal of Aeronautics. All right reserved.


Zong R.-R.,Shandong Nanshan Aluminium Co. | Zong R.-R.,Aerospace Research Institute of Materials And Processing Technology | Hao Q.-H.,Shandong Nanshan Aluminium Co. | Hao Q.-H.,Aerospace Research Institute of Materials And Processing Technology | And 5 more authors.
Suxing Gongcheng Xuebao/Journal of Plasticity Engineering | Year: 2015

Based on the professional Finite Element analysis software called HyperXtrude, the steady extrusion process of a large aluminum profile in arc shape with thin-walled and wide-flat characteristics, which is used for railway vehicles, was numerically simulated and analyzed using the arbitrary Lagrangian-Eulerian (ALE) finite element method. The result shows that the metal flow of the profile is not uniform when the profile was extruded through the initial die. The die structure has been optimized for several times by adding blocks and enlarging the feeding volume, and then the metal flow of the profile is balanced. The simulation result fits well with the experimental result which indicates that theoretical guide can be provided for the die structure design and optimization of the profile with large and complex cross-section by numerical simulation. ©, 2015, Beijing Res. Inst. of Mechanical and Elec. Technology. All right reserved.


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Shandong Nanshan Aluminium Co. | Date: 2013-03-20

Ingots of common metal; common metals, unwrought or semi-wrought; aluminium ingots; sheets or plates of metal; aluminium foil; building materials of metal; statues of common metal; windows of metal; doors of metal; alloys of common metal.

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