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M. Kranc, G. Sikora, M. Górny and A. Garbacz-Klempka

] Lu, L., Shen, Y., Chen, X., Qian, L. & Lu, K. (2004). Ultrahigh Strength and High Electrical Conductivity in Copper. Science. 304, 422-426. [9] Habibi, A., Ketabchi, M. & Eskandarzadeh, M. (2011). Nano-grained pure copper with high-strength and highconductivity produced by equal channel angular rolling process. J. Mater. Process. Technol. 211, 1085-1090. [10] Romankiewicz, F. (1995). Solidification of Copper and its alloys. Poznań- Zielona Góra: PAN. [11] Ẑitňanský M. (1995). Refining of the Copper and investment

Open access

V.C. Sinha, S. Kundu and S. Chatterjee

Abstract

In the present study, the effect of tool rotational speed on microstructure and mechanical properties of friction stir welded joints between commercially pure copper and 6351 Al alloy was carried out in the range of tool rotational speeds of 300-900 rpm in steps of 150 rpm at 30 mm/minutes travel speed. Up to 450 rpm, the interface of the joints is free from intermetallics and Al4Cu9 intermetallic has been observed at the stir zone. However, Al4Cu9 intermetallic was observed both at the interface and the stir zone at 600 rpm. At 750 and 900 rpm tool rotational speed, the layers of AlCu, Al2Cu3 and Al4Cu9 intermetallics were observed at the interface and only Al4Cu9 intermetallics has been observed in the stir zone. The maximum ultimate tensile strength of ~207 MPa and yield strength of ~168 MPa along with ~6.2% elongation at fracture of the joint have been obtained when processed at 450 rpm tool rotational speed.

Open access

Mohd Atif Wahid, Arshad Noor Siddiquee, Zahid Akhtar Khan and Mohammad Asjad

. [4] X-W Li, D.-T. Zhang, Ch. Qiu and W. Zhang. Microstructure and mechanical properties of dissimilar pure copper/1350 aluminium alloy butt joints by friction stir welding. Transaction of Nonferrous Meal Society of China, 22(6):1298-1306, 2012. [5] P. Xue, D.R. Ni, D.Wang, B.L. Xiao and Z.Y. Ma. Effect of friction stir welding parameters on the microstructure and mechanical properties of the dissimilar Al-Cu joints. Materials Science and Engineering: A, 528(13-14):4683-4689, 2011. [6] E. Taban, J.E. Gould and J.C. Lippold. Dissimilar

Open access

Viktor I. Klochko

.I., Manichev V.I., Kompanec G.S., Kovalchuk M.S. 2003 W ychodnie rud miedzi na terenie Ukrainy zachodniej jako baza surowcowa metalurgii kolorowej w okresie funkcjonowania kultury trypolskiej. Folia Praehistorica Posnaniensia, X/XI: 47-78. Klochko V.I., Manichev V.I., Kvasnitsa V.N., Kozak S.A., Demchenko L.V., Sokhatskiy M.P. 2000 I ssues concerning Tripolye metallurgy and the virgin copper of Volhynia. Baltic-Pontic Studies 9: 168-186. Kośko A. (Ed.) 2015 Podolia as a cultural contact area in the 4th/3rd-2nd millennium BC. Baltic

Open access

T. Skrzypczak

-40 (1998). [22] S. Osher, J.A. Sethian, Fronts propagating with curvature-dependent speed: Algorithms based on the Hamilton-Jacobi formulation, Journal of Computational Physics 79 , 12-49 (1988). [23] T. Skrzypczak, E. Węgrzyn-Skrzypczak, Mathematical and numerical model of solidification process of pure metals, International Journal of Heat and Mass Transfer 55 , 4276-4284 (2012). [24] D. Peng, B. Merriman, S. Osher, H. Zhao, A PDE-based fast local level set method, Journal of Com­putational Physics 155 , 410-438 (1999

Open access

Concentrations and uptake of micronutrients by oat and pea in intercrops in response to N fertilization and sowing ratio

Konzentrationen und Aufnahme von Mikronährstoffen durch Hafer und Erbse in Gemengen in Abhängigkeit der N-Düngung und des Mischungsverhältnisses

Reinhard W. Neugschwandtner and Hans-Peter Kaul

Kamada T Sato K 2014 Kinematic gait analysis and lactation performance in dairy cows fed a diet supplemented with zinc, manganese, copper and cobalt Animal Science Journal 85 85 330 Zając, T., Oleksy, A., Stokłosa, A., Klimek-Kopyra, A., Styrc, N., Mazurek, R. and W. Budzyński (2014): Pure sowings versus mixtures of winter cereal species as an effective option for fodder-grain production in temperate zone. Field Crops Research 166, 152–161. Zając T Oleksy A Stokłosa A Klimek-Kopyra A Styrc N Mazurek R Budzyński W 2014 Pure sowings versus mixtures of winter cereal

Open access

Rodoljub D. Stanojlović and Jovica M. Sokolović

References Agar G. E., Chia J., Requis C. L., 1998. Flotation rate measurements to optimize an operating circuit. Min. Eng., 11 (4), p. 347-360. Ahmed I. B., Gbor P. K., JI C. Q., 2000. Aqueous sulfur dioxide leaching of Cu, Ni, Co, Zn, and Fe from smelter slag in the absence of oxygen. Can. J. Chem. Eng., 78 (4), p. 694-703. Altundogan H. S, Tumen F., 1997. Metal recovery from copper converter slag by roasting with ferric sulfate. Hydrome-tallurgy, 44 (1-2), p. 261-267. Arslan C., Arslan F., 2002. Recovery of copper, cobalt, and zinc from copper

Open access

T. Sak and M. Kucharski

Abstract

Density of the copper-rich corner of the ternary Cu-Pb-Fe alloys was determined with the dilatometric method. Investigated alloys had constant copper content equal to 0.9, 0.8 and 0.7 mole fraction, and varied iron concentration up to 0.1 mole fraction. A model predicting the density of ternary solution from knowledge of density of pure component and the excess of molar volume for limiting binaries is proposed.

Open access

K. Pietrzak, A. Gładki, K. Frydman, D. Wójcik-Grzybek, A. Strojny-Nędza and T. Wejrzanowski

Abstract

The main current of publication is focused around the issues and problems associated with the formation of composite materials with Cu matrix and reinforcing phases in the various carbon nanoforms. The core of the research has been focused on thermal conductivity of these composites types. This parameter globally reflects the state of the structure, quality of raw materials and the technology used during the formation of composite materials. Vanishingly low affinity of copper for carbon, multilayered forms of graphene, the existence of critical values of graphene volume in the composite are not conducive to the classic procedures of composites designing. As a result, the expected, significant increase in thermal conductivity of composites is not greater than for pure copper matrix. Present paper especially includes: (i) data of obtaining procedure of copper/graphene mixtures, (ii) data of sintering process, (iii) the results of structure investigations and of thermal properties. Structural analysis revealed the homogenous distribution of graphene in copper matrix, the thermal analysis indicate the existence of carbon phase critical concentration, where improvement of thermal diffusivity to pure copper can occur.

Open access

Vladimír Danielik, Peter Šoška and Katarína Felgerová

Abstract

The paper presents the results of a study on the corrosion behaviour of copper (EN CW004A) in five possible phase change materials (PCMs): magnesium nitrate hexahydrate pure and with an addition of Mg(OH)2 (0.5 wt. %) or Sr(OH)2 (0.5 wt. %) at 90 °C, calcium nitrate tetrahydrate at 50 °C and a mixture of magnesium nitrate hexahydrate and calcium nitrate tetrahydrate (1:1 mass ratio) at 72 °C. The corrosion rate of copper samples is low except for the use of Mg(NO3)2 · 6H2O with/without an addition of Mg(OH)2. The lowest corrosion rate was observed for the mixture Mg(NO3)2 · 6H2O—Ca(NO3)2 · 4H2O (1:1), and it was ca six times lower than that of pure magnesium nitrate hexahydrate.