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Träfflista för sökning "WFRF:(Czyrska Filemonowicz A.) "

Sökning: WFRF:(Czyrska Filemonowicz A.)

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1.
  • Feuerbacher, M., et al. (författare)
  • The Samson phase, β-Mg2Al3, Revisited
  • 2007
  • Ingår i: Zeitschrift für Kristallographie. - 0044-2968. ; 222:6, s. 259-288
  • Tidskriftsartikel (refereegranskat)
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2.
  • Kryshtal, O., et al. (författare)
  • Microstructure and phase composition of the Ag-Al film wear track : Through-thickness characterization by advanced electron microscopy
  • 2019
  • Ingår i: Archives of Metallurgy and Materials. - : POLSKA AKAD NAUK, POLISH ACAD SCIENCES, INST METALL & MATER SCI PAS. - 1733-3490 .- 2300-1909. ; 64:1, s. 251-256
  • Tidskriftsartikel (refereegranskat)abstract
    • Analytical transmission electron microscopy has been applied to characterize the microstructure, phase and chemical composition of the Ag-Al wear track throughout its thickness down to the atomic level. Microscopy findings have been correlated with Ag-Al film tribological properties to understand the effect of the hexagonal solid solution phase on the tribological properties of this film. Ag-25Al (at.%) films have been produced by simultaneous magnetron sputtering of components in Ar atmosphere under 1 mTorr pressure and subjected to pin-on-disc tribological tests. It has been shown that hcp phase with (001) planes aligned parallel to the film surface dominates both in as-deposited and in tribofilm areas of the Ag-Al alloy film. Possible mechanisms of reduced friction in easily oxidized Ag-Al system are discussed and the mechanism based on readily shearing basal planes of the hcp phase is considered as the most probable one.
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3.
  • Feuerbacher, Michael, et al. (författare)
  • The Samson phase, β-Mg2Al3, revisited
  • 2007
  • Ingår i: Zeitschrift fur Kristallographie. - : Walter de Gruyter GmbH. - 0044-2968. ; 222:6, s. 259-288
  • Forskningsöversikt (refereegranskat)abstract
    • The Al-Mg phase diagram has been reinvestigated in the vicinity of the stability range of the Samson phase, β-Mg2Al3 (cF1168). For the composition Mg38.5Al61.5, this cubic phase, space group Fd3̄m (no 227), a = 28.242(1) Å, V = 22526(2) Å3, undergoes at 214°C a first-order phase transition to rhombohedral β′-Mg2Al3, (hR293), a = 19.968(1) Å, c = 48.9114(8) Å, V = 16889(2) Å3, (i.e. 22519 Å3 for the equivalent cubic unit cell) space group R3m (no 160), a subgroup of index four of Fd3̄m. The structure of the β-phase has been redetermined at ambient temperature as well as in situ at 400°C. It essentially agrees with Samson's model, even in most of the many partially occupied and split positions. The structure of β′-Mg 2Al3 is closely related to that of the β-phase. Its atomic sites can be derived from those of the β-phase by group-theoretical considerations. The main difference between the two structures is that all atomic sites are fully occupied in case of the β′-phase. The reciprocal space, Bragg as well as diffuse scattering, has been explored as function of temperature and the β- to β′-phase transition was studied in detail. The microstructures of both phases have been analyzed by electron microscopy and X-ray topography showing them highly defective. Finally, the thermal expansion coefficients and elastic parameters have been determined. Their values are somewhere in between those of Al and Mg.
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  • Resultat 1-3 av 3

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