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Národní úložiště šedé literatury Nalezeno 3 záznamů.  Hledání trvalo 0.02 vteřin. 
Degradation of protective effect of surface layer on Ni3Al-Cr in hydrogen environment
 Čermák, Jiří ; Rothová, Věra
Protective effect of surface layer on Cr-doped (4 and 8 at. % Cr) Ni3Al intermetallic was studied by high-temperature hydrogen permeation tests that were carried out at temperatures in the interval 775-1223 K. Hydrogen with about 1 vol. ppm O2 and 2 vol. ppm of H2O was used for the gas-permeation tests. It was observed that the addition of Cr degrades the - otherwise very good - high-temperature protective ability of oxide-containing surface layer of Ni3Al-Cr at strongly reducing hydrogen environment.
Úplný záznam
Chemical composition of (310) [100] symmetrical tilt grain boundary in Ni3Al
 Čermák, Jiří
Structure of . .SIGMA.5 (310) [100] symmetrical tilt grain boundary in ordered intermetallic alloy Ni3Al was constructed and relaxed by Monte Carlo method using pair L-J - type interatomic potential. Three modified grain boundary structures were tested. They differed in chemical composition and in relative grain boundary energy. The configuration with the lowest grain boundary energy was enriched on nickel.
Úplný záznam
Ab initio simulation of three-axial deformation of perfect iron crystal
 Černý, M. ; Šandera, P. ; Pokluda, J. ; Friák, Martin ; Šob, Mojmír
Ab initio electronic structure calculations of ideal strength, bulk modulus and equilibrium lattice parameter of iron in the body-centered-cubic lattice under three-axial tension are performed using the linear muĆn-tin orbitals method in atomic sphere ap proximation (LMTO-ASA) and the full-potential linearized augmented plane waves method (FLAPW). Magnetic ordering was taken into account by means of spin-polarized calculation. Two exchange-correlation energy approximations were employed, namely the local (spin) den-sity approximation (LDA) and the generalized gradient approximation (GGA). Computed values are compared with experimental data.
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