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Luoyang Henan, China

Wang J.,Henan University of Science and Technology | Jia S.,Henan University of Science and Technology | Jia S.,Henan Key Laboratory of Advanced Non Ferrous Materials | Chen S.,Chinalco Luoyang Copper Co. | And 2 more authors.
Jinshu Rechuli/Heat Treatment of Metals | Year: 2012

The Cu-Ni-Si-Mg alloy was aged after varying cold deformation, the effect of cold deformation, aging temperature and aging time on microstructure and properties of the alloy were investigated. The results indicate that the cold rolling prior to the aging treatment can promote precipitation of second phase during aging and increase the hardness and electrical conductivity. The high hardness and electrical conductivity can be obtained after 60% cold deformation and then aged at 450°C for 1 h, the microhardness and electronic conductivity are 242 HV0.2 and 35.5% IACS, respectively. Both the phase transformation kinetics equation and the electrical conductivity equation were established based on aging at 450°C. Source


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. | 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. Source


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. Source


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. Source


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. | 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. Source

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