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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Difúze 99Mo ve teplně zpracované slitině Fe76Mo8Cu1B15
 Čermák, Jiří ; Stloukal, Ivo
Ion beam sputtering by Ar+ ions was used to investigate 99Mo tracer diffusion in Fe76Mo8Cu1B15 alloy in the temperature range 548 – 648 K. The experimental samples were prepared from ribbons of Fe76Mo8Cu1B15 alloy in as quenched state q, and after pre-annealing at 683 K for 1 h (state a1) and at 743 K for 1 h (state a2). The penetration profiles were obtained using serial sectioning method and consist of two parts suggesting that two different diffusion paths are operating. The Mo short-circuit diffusivity P was evaluated using both LeClaire’s analysis and Divinski’s theory derived for transition type-A/B regime in coarse-grained materials.
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Difúze po 99Mo po rychlý drahách v částečně krystalizovaných slitinách Fe76Mo8Cu1B15, Fe40Ni40B20 a Fe80B20
 Čermák, Jiří ; Stloukal, Ivo ; Schneeweiss, Oldřich
Self-diffusion of 99Mo in three chosen alloys that belong to NANOPERM – type family was studied. The measurement of penetration profiles was carried out by serial sectioning method combined with Ar+ ion beam sputtering technique in the temperature interval 548 – 648 K. Diffusion characteristics in all three experimental materials were measured in as quenched state and in a state after two different pre-annealing treatments: 683 K / 1 h and 743 K / 1 h. It was found that diffusion is controlled by two diffusion mechanisms and that the faster one is sensitive to pre-treatment of the alloy.
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Difúzní studie Fe a Mo ve slitině Fe76Mo8B15Cu1
 Čermák, Jiří ; Stloukal, Ivo
59Fe and 99Mo tracer diffusion in Fe76Mo8B15Cu1 alloy was studied using serial sectioning method in the temperature range 527 – 649 K. The ribbon-like samples were annealed at 695 K for 1 and 5 hours before the diffusion experiments; the volume fraction of crystalline phase was checked by the Mössbauer spectroscopy. Concentration profiles obtained by sputtering by Ar+ ions in a glow discharge show two distinct branches suggesting that two diffusion paths are operating.
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