2000
DOI: 10.1134/1.1333861
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Diffusion of carbon along grain boundaries in niobium

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Cited by 4 publications
(5 citation statements)
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“…Bokstein and Razumovskii also measured C diffusion in niobium at 800–1173 K and report a lower activation energy and higher prefactor for grain boundary diffusion compared with bulk diffusion, which corroborates with our finding of weaker binding energies for the configurations with fewer C–Nb bonds in extended lattice defects than for the configurations with octahedrally coordinated C in the strain field around the lattice defects. Carbon diffusion is accelerated by ∼2 orders of magnitude in grain boundaries. , …”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Bokstein and Razumovskii also measured C diffusion in niobium at 800–1173 K and report a lower activation energy and higher prefactor for grain boundary diffusion compared with bulk diffusion, which corroborates with our finding of weaker binding energies for the configurations with fewer C–Nb bonds in extended lattice defects than for the configurations with octahedrally coordinated C in the strain field around the lattice defects. Carbon diffusion is accelerated by ∼2 orders of magnitude in grain boundaries. , …”
Section: Resultsmentioning
confidence: 99%
“…Carbon diffusion is accelerated by ∼2 orders of magnitude in grain boundaries. 56,57 C−C dimers are also more stable inside of a Nb nearestneighbor divacancy than inside of a single vacancy. The configuration shown in Figure 6a, for example, has a binding energy of −0.60 eV, referred to isolated interstitial C atoms far from the divacancy.…”
Section: Niobium Vacancy Dimer and Trimer Configurations And Their In...mentioning
confidence: 99%
“…These thickness variations are located inside and at grain boundaries, and could be explained by an increased carbon diffusion coefficient. It has been observed in the case of other diffusion couples such as carbon/niobium [27]. Then we could expect that some crystalline defects, like grain boundaries or subgrain boundaries could influence carbon diffusion coefficient in tantalum.…”
Section: Carburizing Of Tantalum Samplesmentioning
confidence: 83%
“…Regarding comparison of our result with experimental work [20,21], this comparison is not easy, since our simulations do not directly yield diffusivities. Rather, the results we present here should be used as input for further calculations using other techniques, such as kinetic Monte Carlo methods.…”
Section: Discussionmentioning
confidence: 94%