Kostadin Gaminchev - Academia.edu (original) (raw)
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Universiti Pertahanan Nasional Malaysia
Indian Institute of Engineering Science and Technology, Shibpur
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Papers by Kostadin Gaminchev
Journal of Physics: Conference Series, 2012
ABSTRACT We investigated the melting properties of bulk nickel and the crystallization of nickel ... more ABSTRACT We investigated the melting properties of bulk nickel and the crystallization of nickel nanocrystals via molecular dynamics using a potential in the framework of the second moment approximation of tight-binding theory. The melting behavior was simulated with the hysteresis approach by subsequently heating and cooling gradually the system over a wide range of temperatures. The crystallization of nickel nanoclusters consisting of 55, 147 and 309 atoms was achieved after repeatedly annealing and quenching the corresponding quasicrystals several times to avoid being trapped in a local energy minimum. The time over which the global minimum was reached was found to increase with the cluster size.
arXiv: Materials Science, 2017
We investigate the basic thermal, mechanical and structural properties of body centred cubic iron... more We investigate the basic thermal, mechanical and structural properties of body centred cubic iron ($\alpha$-Fe) at several temperatures and positive loading by means of Molecular Dynamics simulations in conjunction with the embedded-atom method potential and its modified counterpart one. Computations of its thermal properties like average energy and density of atoms, transport sound velocities at finite temperatures and pressures are detailed studied as well. Moreover, there are suggestions to obtain hexagonal close- packed structure ($\varepsilon$-phase) of this metal under positive loading. To demonstrate that, one can increase sufficiently the pressure of simulated system at several temperature's ranges; these structural changes depend only on potential type used. The ensuring structures are studied via the pair radial distribution functions (PRDF) and precise common- neighbour analysis method (CNA) as well.
Journal of Physics: Conference Series, 2014
ABSTRACT We study the dynamic stability of bcc iron at both high pressure and temperature via Mol... more ABSTRACT We study the dynamic stability of bcc iron at both high pressure and temperature via Molecular Dynamics in conjunction with three different interatomic potentials constructed within the embedded-atom method. We computed the phonon dispersions, the phonon density of states, as well as the radial distribution functions. It is found that these quantities exhibit different behaviours depending on the potential used. Furthermore it is revealed that the simulated sample remains dynamically stable over a wide range of temperature and pressure for all potentials.
Journal of Physics: Conference Series, 2012
ABSTRACT We investigated the melting properties of bulk nickel and the crystallization of nickel ... more ABSTRACT We investigated the melting properties of bulk nickel and the crystallization of nickel nanocrystals via molecular dynamics using a potential in the framework of the second moment approximation of tight-binding theory. The melting behavior was simulated with the hysteresis approach by subsequently heating and cooling gradually the system over a wide range of temperatures. The crystallization of nickel nanoclusters consisting of 55, 147 and 309 atoms was achieved after repeatedly annealing and quenching the corresponding quasicrystals several times to avoid being trapped in a local energy minimum. The time over which the global minimum was reached was found to increase with the cluster size.
arXiv: Materials Science, 2017
We investigate the basic thermal, mechanical and structural properties of body centred cubic iron... more We investigate the basic thermal, mechanical and structural properties of body centred cubic iron ($\alpha$-Fe) at several temperatures and positive loading by means of Molecular Dynamics simulations in conjunction with the embedded-atom method potential and its modified counterpart one. Computations of its thermal properties like average energy and density of atoms, transport sound velocities at finite temperatures and pressures are detailed studied as well. Moreover, there are suggestions to obtain hexagonal close- packed structure ($\varepsilon$-phase) of this metal under positive loading. To demonstrate that, one can increase sufficiently the pressure of simulated system at several temperature's ranges; these structural changes depend only on potential type used. The ensuring structures are studied via the pair radial distribution functions (PRDF) and precise common- neighbour analysis method (CNA) as well.
Journal of Physics: Conference Series, 2014
ABSTRACT We study the dynamic stability of bcc iron at both high pressure and temperature via Mol... more ABSTRACT We study the dynamic stability of bcc iron at both high pressure and temperature via Molecular Dynamics in conjunction with three different interatomic potentials constructed within the embedded-atom method. We computed the phonon dispersions, the phonon density of states, as well as the radial distribution functions. It is found that these quantities exhibit different behaviours depending on the potential used. Furthermore it is revealed that the simulated sample remains dynamically stable over a wide range of temperature and pressure for all potentials.