Results 1 - 10 of 16107
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[en] In the paper original considerations concerning the problem of obtaining materials with predetermined properties are exposed. It was shown that on the basis of the configuration model of the solid state it is possible to explain and prognosticate materials properties. Ways for the obtaining of the materials with entirely new properties are indicated
[en] We have studied magnetic and transport properties of NbN/FeN/Cu/FeN/FeMn spin-valve structure. In-plane magnetic moment exhibited typical hysteresis loops of spin valves in the normal state of NbN film at 20 K. On the other hand, the magnetic hysteresis loop in the superconducting state exhibited more complex behavior in which exchange bias provided by antiferrmagnetic FeMn layer to adjacent FeN layer was disturbed by superconductivity. Because of this, the ideal superconducting spin-valve effect was not detected. Instead the stray field originated from unsaturated magnetic states dominated the transport properties of NbN/FeN/Cu/FeN/FeMn multilayer
[en] Spinodal decomposition was studied during aging of Fe-Cr alloys by means of the numerical solution of the linear and nonlinear Cahn-Hilliard differential partial equations using the explicit finite difference method. Results of the numerical simulation permitted to describe appropriately the mechanism, morphology and kinetics of phase decomposition during the isothermal aging of these alloys. The growth kinetics of phase decomposition was observed to occur very slowly during the early stages of aging and it increased considerably as the aging progressed. The nonlinear equation was observed to be more suitable for describing the early stages of spinodal decomposition than the linear one. (Author)
[en] The report presents an Fe-Cr interatomic potential to model high-Cr ferritic alloys. The potential is fitted to thermodynamic and point-defect properties obtained from density functional theory (DFT) calculations and experiments. The developed potential is also benchmarked against other potentials available in literature. It shows particularly good agreement with the DFT obtained mixing enthalpy of the random alloy, the formation energy of intermetallics and experimental excess vibrational entropy and phase diagram. In addition, DFT calculated point-defect properties, both interstitial and substitutional, are well reproduced, as is the screw dislocation core structure. As a first validation of the potential, we study the precipitation hardening of Fe-Cr alloys via static simulations of the interaction between Cr precipitates and screw dislocations. It is concluded that the description of the dislocation core modification near a precipitate might have a significant influence on the interaction mechanisms observed in dynamic simulations.
[en] The displacive growth of the partially carbon supersaturated plates of ferrite during the transformation of austenite have been examined, using a theory for nonequilibrium transformation, for Fe-0.3 C wt.% alloy. The calculations indicate that at bainite-start temperature of the plates of ferrite grow with full supersaturation of carbon even though carbon may partition during the nucleation. Both processes tend to become completely diffused less at the martensite-start temperature. The time temperature transformation (TTT) diagram has also been predicted and compared with that obtained from the other established models for the displacive transformation of austenite. (author)