Chinalco Luoyang Copper Co.

Henan’an, China

Chinalco Luoyang Copper Co.

Henan’an, China
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Ding Z.-Y.,Henan University of Science and Technology | Jia S.-G.,Henan University of Science and Technology | Jia S.-G.,Henan Key Laboratory of Advanced Non ferrous Metals | Li X.-H.,Chinalco Luoyang Copper Co Ltd | And 3 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

The flow stress behavior of Cu-0.94Cr-0.32Zr alloy was studied by thermal simulation test at the deformation temperature of 500~800°C and the strain rate of 0.01~1 s-1 on the Gleeble-1500 thermal-mechanical simulator. The results show that the flow stress decreases with the increasing of deformation temperature or the decreasing of strain rate. The flow stress behavior of Cu-0.94Cr-0.32Zr alloy is derived by hyperbolic sine equation containing Zener-Hollomon parameter. The constitutive equation is established with the activation energy 418.35 kJ/mol. According to the dynamic material modeling, the processing map is established and the flow instability zone is found. The best deformation temperature and strain rate of alloy are 775°C and 0.01 s-1.


Wang J.F.,Henan University of Science and Technology | Jia S.G.,Henan University of Science and Technology | Chen S.H.,Chinalco Luoyang Copper Co. | Song K.X.,Henan University of Science and Technology | And 2 more authors.
Advanced Materials Research | Year: 2011

The Cu-Ni-Si-Mg alloy was treated by aging after varying cold deformation. The effect of cold deformation, aging temperature and aging time on the microstructure and properties of the alloy were investigated. The results indicate that the alloy produce a larger number of slip bands and dislocations after cold deformation, it can accelerate the precipitation of phase during aging, improve the microhardness and electrical conductivity. The microhardness and electrical conductivity of the alloy with 80% deformation aging at 723 K for 1h are 242HV and 35.53%IACS, respectively. The volume fraction of the precipitated phase was calculated by measuring the electrical conductivity of the alloy with 80% deformation aging at 773 K, then both the equations of phase transformation and the electrical conductivity equation were obtained. © (2011) Trans Tech Publications.


Deng M.,Henan University of Science and Technology | Deng M.,Henan key Laboratory of Advanced Non ferrous Metals | Jia S.-G.,Henan University of Science and Technology | Jia S.-G.,Henan key Laboratory of Advanced Non ferrous Metals | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

The effects of cold rolling, aging temperature and aging time on microhardness and conductivity of Cu-2.3Ni-0.5Si-0.22Zn-0.06Mg alloy were studied. The results show that microhardness and electrial conductivity were effectively improved by aging and cold rolling. In addition, The aging time were sharply decreased by changing aging temperature and cold rolling. It is not necessary for the alloy to go on solution treatment after hot rolling, and the microhardness and conductivity could reach 287 HV and 43%IACS respectively when the alloy with 80% cold deformation and then aged at 500°C for 1 hour.


Wang J.-F.,Henan University of Science and Technology | Jia S.-G.,Henan University of Science and Technology | Chen S.-H.,CHINALCO Luoyang Copper Co. | Liu P.,Henan University of Science and Technology | And 2 more authors.
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | Year: 2012

The transformation ratio of new phase in Cu-Ni-Si alloy was calculated in terms of analyzing the electrical conductivity variations and the relationship between the electrical conductivity and the quantity of new phase. Both the Avrami phase transformation kinetics equation and the electrical conductivity equation changing with the aging time were derived at different temperatures, the transformation kinetics "S" curve was drawn. Then, though integral functions of the reactive mechanism of thermal decomposition of solid solution, the Avrami formulation for describing the kinetics of the phase transformation is proved to be correct. The precipitates are δ-Ni2Si and β-Ni3Si phases by indexing the selected field diffraction pattern of precipitates of Cu-Ni-Si alloy aging at 500°C for 8 h.


Wang J.-F.,Henan University of Science and Technology | Jia S.-G.,Henan University of Science and Technology | Jia S.-G.,Henan Key Laboratory of Advanced Non Ferrous Materials | Chen S.-H.,Chinalco Luoyang Copper Co LTD | And 2 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

Effects of aging temperature and aging time on microstructure and properties of a Cu-Ni-Si-Mg alloy which was produced by continuous casting and rolling process were investigated, and the aging kinetics of the alloy was analyzed. The results show that a better combination of properties is obtained for the alloy aged at 450°C for 2 h, the microhardness and electrical conductivity of the alloy are 242 HV and 35.53%IACS, respectively. Both phase transformation kinetics equation and electrical conductivity equation are derived in terms of the analyses of the electrical conductivity variations during aging, and the transformation kinetics and the electrical conductivity equation curves are obtained. The results obtained by the electrical conductivity equations are in good agreement with the experimental values.


Shen X.,University of Science and Technology Beijing | Zhang H.,University of Science and Technology Beijing | Wang Z.-D.,University of Science and Technology Beijing | Lou H.-F.,CHINALCO Luoyang Copper Co. | And 2 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2010

The macrostructure and properties of the thin walled copper tube prepared by the downward continuous unidirectional solidification (DCUS) method were studied. The result shows that the macrostructure is closely related to the solid-liquid interface profile, which is influenced by the distance between the cooling water location and the solidification front. The mechanical properties of the thin walled copper tube prepared by the DCUS method are near those of the normal cast copper, and it has good relative density, electrical conductivity, and elongation, which are not greatly affected by casting speed. The thin walled copper tube prepared by the DCUS method also has good processing properties that can be taken to further drawing procedures directly without an intermediate process, and obtains good mechanical properties with the total processing rate of 89.8%. © University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg 2010.


Zhang W.-H.,Chinalco Luoyang Copper Co.
Zhuzao/Foundry | Year: 2011

Cast mold is very important in the casting of copper and copper alloy. Not only does cast mold have different categories and characteristics, but also it has different structure. The paper discusses the structural design of graphite mold for casting of copper and copper alloy. At the same time, some aspects can not be ignored such as a reasonable machining process, assembly, plating quality, well maintenance, and acidwashing etc.


Ren Y.,Central South University | Ren Y.,Chinalco Luoyang Copper Co. | Wang M.,Central South University | Li Z.,Central South University | Lei Q.,Central South University
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2014

The temperature field and flow field of high temperature melt in the nozzle in the casting-rolling copper process were simulated by the ANSYS software. The results reveal that at a fixed casting-rolling temperature, with the increase of casting speed, the solidification position of roll-casting billets is gradually shift to right, and the flow uniformity is increased. However, the over-high rolling speed is harmful for forming of roll-casting billet and roll of the plate. At a given roll-casting speed, with the increase of pouring temperature, roll-casting billet solidification position is shifted to right gradually, however effects on the flow field distribution can be ignored. The optimized processing parameters were presented as follows: roll casting temperature of 1150°C~1170°C and roll casting speed of 600 mm/min~1000 mm/min. Based on the optimized parameters, the T2 copper continuous roll casting slab was formed successfully.


Guo Y.-P.,University of Science and Technology of China | Guo X.-H.,Chinalco Luoyang Copper Co. | Deng J.-P.,University of Science and Technology of China
Materials Science Forum | Year: 2015

In this paper, tensile properties at room temperature and bending rupture properties of single crystal aluminum wire, 4mm in diameter, fabricated by ohno continuous casting were studied, and its fracture was analyzed. The results showed that: Compared with polycrystalline aluminum samples, the yield strength of Ohno Continuous Casting single crystal aluminum changed little; Ultimate strength decreased by 42.7%; Elongation and reduction of area increased by 111.5% and 575%; Bending fatigue strength have been enhanced distinctly. Fracture of single crystal aluminum were flat tip shape, the slip line near fracture parallel to each other and uniformly distributed, the fracture is typical dimple structure and the dimple size were relatively uniform, appeared as parabolic. © (2015) Trans Tech Publications, Switzerland.


Wang S.,Chinalco Luoyang Copper Co. | Wang Q.-Y.,Chinalco Luoyang Copper Co.
Yejin Fenxi/Metallurgical Analysis | Year: 2010

Many factors influencing the determination stability of iron and phosphorus in pure copper by spark source atomic emission spectrometry were preliminarily discussed. It was found that the stability of instruments, the preparation of sample, the purity of argon, the vacuum of light room and the selection of control sample all affected the analytical result stability of iron and phosphorus in pure copper. In order to improve the stability and accuracy of analysis results, five measures were carried out: tracing the instrument on schedule or demand; correcting the drift of working curve with re-calibrated sample; preparing the sampling mold according to the composition or shape of samples, guaranteeing the purity of argon and replacing the argon if abnormal provocative patch appeared; determining the vacuum of light room according to the observation and the absolute intensity change of shortwave elements; adopting the same or similar melting method for control sample and testing sample to guarantee the homogeneity and accuracy. By adopting the above-mentioned methods, pure copper standard samples were tested. The reproducibility could meet the requirements of standard.

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