National Repository of Grey Literature 9 records found  Search took 0.00 seconds. 
Influence of lattice defects on grain boundary self-diffusion in nickel
Rothová, Věra ; Buršík, Jiří ; Svoboda, Milan
An extremely wide spectrum of experimental results on the grain boundary (GB) self-diffusivities in nickel was published in the literature. Currently, our previously published results show a pronounced dependence of diffusivities on both purity and thermo-mechanical history. A possible reason for the large scatter of published experimental data could be a contribution arising from some crystal lattice defects other than GBs. Thus, in the present work, the impact of the selected lattice defects on diffusion processes, grain growth and twin production has been investigated. Hence, the cast and cold-rolled nickel specimens of purity grades from 99.5% to over 99.99% were selected to study the influence of the material purity and fabrication on microstructure and its evolution during thermal treatment and thereby on the mass transport properties.
Grain boundary self-diffusion in nickel: Comparison of theoretical and experimental diffusivities
Rothová, Věra ; Svoboda, Milan ; Buršík, Jiří
An extremely wide spectrum of the experimental results of the grain boundary self-diffusivities in nickel was published in the literature. By using two approaches based on the empirical correlations and rules, the purpose of this study is to theoretically estimate the grain boundary (GB) self-diffusivities in nickel. The obtained dependences are compared with one another as well as with the literature experimental data.
Autodifúze niklu po hranicích zrn 3. Vliv čistoty vzorku
Rothová, Věra ; Buršík, Jiří ; Svoboda, Milan ; Čermák, Jiří
The effect of material purity on diffusional transport in the pure (Puratronic 99.9945%) and the technical (99.5%) nickel has been studied by means of diffusion and EBSD measurements.
Autodifúze po hranicích zrn v niklu 2. Vliv předžíhání
Rothová, Věra ; Buršík, Jiří ; Svoboda, Milan ; Čermák, Jiří
The aim of this paper is to examine an effect of various pre-annealing regimes on the 63Ni GB transport in the Puratronic 4N5 nickel by means of the serial sectioning method and on grain boundary character distribution via electron backscatter diffraction.
Autodifúze niklu po hranicích zrn 1. Vliv zpracování vzorku
Rothová, Věra ; Svoboda, Milan ; Buršík, Jiří ; Čermák, Jiří
The aim of this paper is to examine an effect of sample processing (a cast sample compared with a cold-rolled sample) on both the Ni grain boundary transport properties and the grain boundary character distribution (GBCD) investigated by means of electron backscatter diffraction method (EBSD).
Determination of diffusion and segregation characteristics of 32P in polycrystalline Fe ů 2.2 wt.% Si
Stloukal, Ivo ; Herzig, C.
The grain boundary diffusion of phosphorus in polycrystalline Fe ů 2.2 wt.% Si was measured using serial sectioning method with radioisotope 32P. The measurements were carried out under the conditions of the B-regime (845 ů 1173 K) and the C-regime (735 ů 830 K.
Difúze izotopů 67Ga a 68Ge podél hranic zrn v niklu
Čermák, Jiří ; Rothová, Věra
The 67Ga and 68Ge grain boundary diffusion in polycrystalline nickel has been investigated by the radiotracer serial sectioning method
Difúze hliník substituujících prvků podél hranic v Ni3Al
Rothová, Věra ; Čermák, Jiří
The grain boundary diffusion of 67Ga and 68Ge as Al-simulating elements in the Ni-rich Ni3Al alloys has been investigated using the serial sectioning method
Studium objemové difúze Ga a difúze Ga podél hranic zrn v polykrystalickém hořčíku
Stloukal, Ivo ; Čermák, Jiří
Gallium grain boundary (GB) diffusion in polycrystalline Mg was measured by the residual activity method under the condition of B-type kinetic in temperature range 639 - 872 K

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