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Divinski, Sergiy V.; Lohmann, M.; Surholt, T.; Herzig, Chr.

doi:10.1023/a:1015187501784

Cited by 16 publications

(4 citation statements)

References 10 publications

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“…2b presents Ag penetration profiles in pure Cu which were also measured in the B regime [8]. That curvature was reliably explained by the effect of moving boundaries [8], that was verified by measurements using other tracers with different segregation behavior (Cu and Au) in Cu polycrystals [12]. The temperature dependence of the fraction f m of moving boundaries in pure polycrystalline Cu is given in Fig.…”

Section: Resultssupporting

confidence: 62%

Tracer Diffusion and Linear and Non-Linear Segregation in Cu Poly- and Bicrystals

Herzig

Lohmann

Divinski

2003

DDF

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Ag grain boundary (GB) diffusion in Cu and Cu-0.2 at.% Ag alloy was measured in the B and C regimes and the equilibrium segregation factor s was determined for the pure metal and the alloy. In the C regime, Ag GB diffusivity Ag gb D in the Cu-0.2 at.% Ag alloy was directly measured and it was shown that Ag gb D is similar to the Ag GB diffusivity in pure Cu. The B regime penetration profiles are curved in both pure Cu and the Cu-Ag alloy. In order to elucidate the reasons of this curvature, Ag GB diffusion was measured in pure and alloyed Cu bicrystals. It was shown that in the present experimental conditions non-linear segregation affects the Ag penetration profiles in bicrystals, whereas linear segregation occurs in pure Cu polycrystals due to the different levels of Ag concentration present in the GBs. The effect of Ag alloying of Cu poly-and bicrystals depends remarkably on the temperature and produces a systematic variation of the profile shape and of the measured diffusion coefficients. As a result, the segregation isotherm of Ag in Cu GBs was determined.

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Section: Resultssupporting

confidence: 62%

Tracer Diffusion and Linear and Non-Linear Segregation in Cu Poly- and Bicrystals

Herzig

Lohmann

Divinski

2003

DDF

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“…In that investigation it was convincingly shown that the profile curvature was a result of GB motion during diffusion anneal [23]. The investigations with different radiotracers (Ag, Au, Cu) in the same Cu material gave similar results for both the absolute values as well as for the activation enthalpy of motion of arbitrary large-angle boundaries [33]. The segregation of Ag in Cu remained to be linear along the corresponding profiles in that case, since the GB concentration of Ag atoms in polycrystalline Cu was estimated to be less than 10 À3 (in mole fractions) [23].…”

Section: Resultsmentioning

confidence: 71%

Quantitative experiments on the transition between linear to non-linear segregation of Ag in Cu bicrystals studied by radiotracer grain boundary diffusion

Divinski¹,

Lohmann²,

Prokofjev³

et al. 2005

MEKU

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Quantitative experiments on the transition between linear to non-linear segregation of Ag in Cu bicrystals studied by radiotracer grain boundary diffusion Dedicated to Professor Dr. Lasar Shvindlerman on the occasion of his 70th birthday Non-linear segregation of Ag in Cu grain boundaries (GB) was quantitatively studied by radiotracer GB diffusion measurements on Cu bicrystals with non-special near R5 symmetrical ½001 tilt boundaries. Bicrystals were used to guarantee a stable GB during the annealing avoiding in this way disturbing effects like GB motion etc. on the measured diffusion penetration profile. The 110m Ag radioisotope with a well-defined specific activity was applied. This allowed to determine quantitatively the amount of Ag solute atoms in a section as a function of the penetration depth. The controlled variation of the total amount of diffusing Ag atoms along the Cu GB resulted in a fundamental change of the GB penetration profile shape from almost linear to strongly curved. The curvature of the penetration profiles was unambiguously shown to be caused by non-linear segregation of Ag in Cu GB. The full Ag segregation isotherm was calculated from the corresponding GB diffusion penetration profile.

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“…27) If a fraction f ðmovÞ 6 ¼ 0 of GBs moves during the diffusion anneal, the GB diffusion-related part of the penetration profile can be presented by a sum of two exponentials: 24) cðy; tÞ…”

Section: Influence Of Moving Boundaries On Gb Diffusionmentioning

confidence: 99%

“…(27). Typical penetration profiles measured for Ni diffusion in nano--Fe-Ni along with the fits according to eq.…”

Section: )mentioning

confidence: 99%

Grain Boundary Diffusion in Metals: Recent Developments

Herzig¹,

Divinski²

2003

Mater. Trans.

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An overview on recent progress in grain boundary (GB) diffusion study is presented with emphasis on physical phenomena encountered in GB diffusion experiments such as the linear and non-linear segregation effects. Systematic investigations on pure and alloyed poly-and bicrystals gave conclusive information on the solute segregation behavior and allowed to extract the segregation isotherm solely from GB diffusion studies. Recent progress in fundamental understanding of diffusion processes in two-scale materials with two types of short-circuit diffusion paths is discussed on the basis of GB self-diffusion experiments and Monte-Carlo simulations in powder sintered nanocrystalline material.

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Untitled

Cited by 16 publications

References 10 publications

Tracer Diffusion and Linear and Non-Linear Segregation in Cu Poly- and Bicrystals

Tracer Diffusion and Linear and Non-Linear Segregation in Cu Poly- and Bicrystals

Quantitative experiments on the transition between linear to non-linear segregation of Ag in Cu bicrystals studied by radiotracer grain boundary diffusion

Grain Boundary Diffusion in Metals: Recent Developments

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