Papers by Keyword: Immiscible Systems

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Authors: Stefano Enzo, G. Mulas, R. Frattini, G. Principi, Rajesh Gupta, R. Cooper, Neil Cowlam
Authors: P.P. Macrí, P. Rose, D.E. Banda, Neil Cowlam, G. Principi, Stefano Enzo
Authors: H. Kaffash, Ali Shokuhfar, Hamid Reza Rezaie, Ehsan Mostaed, Ali Mostaed
Abstract: Fabrication of alloys in the solid state via mechanical alloying (MA) process has been studied by earlier researchers. The effects of milling time and impact force, defined as the ball-to-powder weight ratio (BPR), on the elemental diffusion during synthesis of nanostructured Fe-50at.%Cu alloy via MA process were evaluated in the current work. X-ray diffraction patterns revealed that increasing the milling time and impact force give rise to increasing the micro-strain, lattice parameter and decreasing the crystallite size during the MA process. Furthermore, scanning electron microscopy (SEM) was utilized not only for evaluating the microstructure of the milled powder particles but also for proving this claim that during MA process, the mutual diffusion of Cu and Fe has occurred. The interpretation of data resulted have been discussed in details.
Authors: M. Angiolini, Marek Krasnowski, G. Mazzone, Amelia Montone, M. Urchulutegui, Marco Vittori Antisari
Authors: Anatoly Ye. Yermakov, Mikhail A. Uimin, A.V. Shangurov, Alexander V. Zarubin, Y.V. Chechetkin, A.K. Shtolz, V.V. Kondratyev, G.N. Konygin, Y.P. Yelsukov, Stefano Enzo, P.P. Macrí, R. Frattini, Neil Cowlam
Authors: M. Angiolini, G. Mazzone, Amelia Montone, Marco Vittori Antisari
Authors: D. Bonyuet, J. Ochoa, Gema González
Authors: S.H. Mir Shah Ghassemi, Ali Shokuhfar, Mohammad Reza Vaezi
Abstract: The study of mechanical alloying on the Fe–Cu system, as a model system for those with positive heats of mixing, are investigated. In this research work the effects of impact force, such as increasing in the surface temperature of powders, the number of vacancies and pipe diffusion, on the strain and grain size of final powders have been studied. The aim of this research is to find the optimum condition for mechanical alloying of Cu-Fe system by the help of automatic design and analysis of TAGUCHI experiments.
Authors: Susi Kahofer, Michael Zehetbauer, Herbert Danninger, Erhard Schafler, Michael Kerber, Jelena Horky
Abstract: Precompacts out of immiscible systems CuCr (75/25 wt%) and WCu (80/20 wt%), respectively, were made by pressing mixed powders and sintering. By applying different strains and hydrostatic pressures of HPT at room temperature, disc-shaped samples with a diameter of 8 mm were produced. They were investigated by Light Microscopy, Scanning-Electron Microscopy using Back-Scattered Electrons, and X-ray Line Profile Analysis. In addition, Vickers microhardness data were collected. Both systems showed the highest microhardness at a shear strain of about γ = 170. The density (for the case of Cu25Cr) of the consolidated material could be increased to the theoretical value. Microhardness and grain sizes were studied individually for each of the phases, too.
Authors: M.J. Barro, E. Navarro, P. Agudo, Antonio Hernando, P. Crespo, Asuncion Garcia Escorial
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