*Corresponding author currently at: Department of Physics, Faculty of Science, Aljouf University, Sakaka 2014, Saudi Arabia.
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Keywords: Co-Cu alloys Phase decomposition X-Ray diffraction Rietveld analysis Computer simulationĪbbreviations: T, Absolute temperature r, Crystal lattice position and its time derivative (r'andr") p, Position vector for the lattice points, and its derivatives (p' and p") t, Time c(r,t), Occupation probability of finding a solute atom at position r in time t c(p,t), Occupation probability of finding a solute atom at positionp in time t c0, Average composition L(r - r'), Matrix of kinetic coefficients related to probabilities of elementary diffusional jumps from lattice site r to r' of a Bravais lattice Wfp' - p", c(p'), c(p"), T}, Function of a pair wise interaction energy between atoms, at interatomic distance (p' - p") Wstr At, Time interval CjU, Elastic stiffness constant F, Helmholtz free energy hx and hy, Directional components of the wave vector h ca, Atomic fraction of atoms of kind a © 2014 Chinese Materials Research Society. The results indicate that the morphology and the shape of the microstructure agree with SEM observation. The excess free energy as well as the strain energy, without a priori knowledge of the shape or the position of the new phase, was precisely evaluated. Two-dimensional computer simulations were conducted to study the phase decomposition of Co-Cu binary alloy systems. The shifts in the refined lattice constants (a, b and c), the space group and the grain size were found to be phase- and heat treatment-dependant. Since the Bragg reflections from different phases of Co-Cu alloy significantly overlap, the crystal structural parameters were refined with FULLPROF program. The formation of dendrite Co phase rendered the spinodal decomposition while the oxidations prevent the initiation of the spinodal decomposition even for a deep long aging inside the miscibility gap. X-ray diffraction analysis showed that the samples contained Co, Cu, CuO, CoCu2O3, CoCuO2 phases in different proportions depending on the heat treatment regimes. The materials and phase compositions were investigated using energy dispersive spectrometry and X-ray diffraction techniques. Few samples were aged in a furnace for either 3 or 5 h and then quenched in iced water.
The influence of heat treatment on the phase decomposition and the grain size of Co-10 at% Cu alloy were studied. Received 8 February 2014 accepted 1 October 2014 Available online 4 December 2014 Microstructural study and numerical simulation of phase decompositionĪDepartment of Physics, Faculty of Science, Assiut University, Assiut 71516, Egypt Department of Physics, Faculty of Science, Aljouf University, Sakaka 2014, Saudi Arabia The results indicate that the morphology and the shape of the microstructure agree with SEM observation.Īvailable online at SrienCeDireCt Progress in NaturalĮLSEVIER Progress in Natural Science: Materials International 24 (2014) 599-607. Two-dimensional computer simulations were conducted to study the phase decomposition of Co–Cu binary alloy systems. Since the Bragg reflections from different phases of Co–Cu alloy significantly overlap, the crystal structural parameters were refined with FULLPROF program. Few samples were aged in a furnace for either 3 or 5h and then quenched in iced water. The influence of heat treatment on the phase decomposition and the grain size of Co–10at% Cu alloy were studied. Abstract of research paper on Materials engineering, author of scientific article - A.M.
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