On the Enhancement of the Diffusion Permeability near Triple Junctions

Mikhailovskii, I. M.; Rabukhin, V. B.; Velikodnaya, O. A.

doi:10.1002/pssa.2211250237

Cited by 15 publications

(4 citation statements)

References 3 publications

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“…So, Bokstein reported about a factor of 100 faster diffusion of Zn along Al triple junctions . Similarly the diffusion of nitrogen in TJs of tungsten are indicated to be 120 times faster than in GBs . The elevated diffusion rate in TJs was supposed to be due to larger free volume of the TJ structure.…”

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confidence: 97%

“…16 Similarly the diffusion of nitrogen in TJs of tungsten are indicated to be 120 times faster than in GBs. 43 The elevated diffusion rate in TJs was supposed to be due to larger free volume of the TJ structure. This idea of a larger free volume is also supported by a recent quantitative analysis of Cr segregation to TJs in nanocrystalline Fe by Stender et al 29 who documented for TJs a segregation enthalpy more similar to free surfaces than to GBs.…”

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confidence: 99%

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Triple Junction Transport and the Impact of Grain Boundary Width in Nanocrystalline Cu

et al. 2012

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Triple junctions (TJ), singular topological defects of the grain boundary (GB) structure, get a dominant role for grain growth and atomic transport in nanocrystalline matter. Here, we present detailed measurements by atom probe tomography, even of the temperature dependence of TJ transport of Ni in nanocrystalline Cu in the chemical regime of interdiffusion. An unexpected variation of the effective width of merging GBs with temperature is detected. It is demonstrated that proper measurement of TJ transport requires taking into account this remarkable effect. TJ diffusion is found to be a factor of about 200 faster than GB diffusion. Its activation energy amounts to only two-thirds of that of the GB.

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confidence: 97%

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Triple Junction Transport and the Impact of Grain Boundary Width in Nanocrystalline Cu

et al. 2012

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“…Several authors have reported that the junction lines, where three or more interfaces meet, have an important influence on a number of material properties. These include mechanical behaviour [2][3][4][5], wetting phenomena [6,7], diffusion effects [8][9][10], intergranular corrosion [11] and material amorphisation [12]. In the present work, we discuss the nature of junction lines in terms of defect character since this can provide a helpful framework for understanding their role in physical processes.…”

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confidence: 99%

The defect character of interface junction lines

1997

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Abstract. Junction lines, where three or more interlaces meet in polycrystalline materials, are analysed from a topological point of view. Using circuit mapping methods, it is shown that, in contiguous polycrystals, the dislocations constituting the interfaces always react at junctions according to topological conservation principles. This conclusion is at variance with recent suggestions in the literature. In addition, it is shown that, in certain circumstances, junction lines can themselves exhibit defect character, i.e., dislocation and/or disclination character. Such defects arise in order to accommodate the coexistence of the abutting crystals. Simple examples are illustrated.

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“…These include material mechanical behaviour (Hashimoto, Fujii & Miura, 1987;Sisanbaev & Valiev, 1992), wetting phenomena (indekeu & Nikas, 1991), diffusion effects (Mikhailovskii, Rabukhin & Velikodnaya, 1991;Randle, 1993) and intergranular corrosion (Palumbo & Aust, 1988).…”

Section: Introductionmentioning

confidence: 99%

Symmetry Analysis of Interface Triple Junctions

Dimitrakopulos¹,

Karakostas²

1996

Acta Cryst Sect A

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The symmetry properties of triple junctions formed by crystal interfaces are presented using colour crystallography. Triple junctions are treated as composites of three crystals and are studied using the principle of superposition of symmetries. The conclusions are used for the understanding of the equivalences and invariances within one tricrystal composite and for studying such composites from the point of view of interfacial connectivity. A dissymmetrization procedure is established through which tricrystals equivalent by symmetry and their ways of coexistence can be found. Also, the relations between the symmetry properties of the tricrystal and those of the three bicrystals participating in the junction are given. Emphasis is placed on a particular class of composities that are termed variant constituted tricystals. In these, two out of three bicrystals belong to orientation variants of the same dichromatic pattern. Such composites are usual in polycrystals and can exhibit interesting symmetry properties. The ordinary symmetry and antisymmetry in the third bicrystal can be predicted using a given algorithm. Appropriate examples are given to illustrate the application of the analysis.

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On the Enhancement of the Diffusion Permeability near Triple Junctions

Cited by 15 publications

References 3 publications

Triple Junction Transport and the Impact of Grain Boundary Width in Nanocrystalline Cu

Triple Junction Transport and the Impact of Grain Boundary Width in Nanocrystalline Cu

The defect character of interface junction lines

Symmetry Analysis of Interface Triple Junctions

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