Thermodynamic aspects of the grain boundary segregation in Cu(Bi) alloys

Chang, Li-Chung; Rabkin, Eugen; Straumal, Boris B.; Baretzky, B.; Gust, W.

doi:10.1016/s1359-6454(99)00264-5

Cited by 113 publications

(56 citation statements)

References 10 publications

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“…It has been shown that the phase boundaries are changed compared to the generally accepted phase diagrams for example in Cu-Bi [54,55], W-Ni [56] and Mo-Ni [56] by as much as 0.08 at.% Bi, 0.31 at.% Ni and 1.7 at.% Ni, respectively. Thus, the potential formation of another phase at the interface would affect the phase boundary data Fig.…”

Section: Resultsmentioning

confidence: 92%

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Estimation of the activation energy for surface diffusion during metastable phase formation

et al. 2015

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Section: Resultsmentioning

confidence: 92%

“…According to Cantor and Cahn [54] the surface diffusion of atoms is eventually limited by the presence of adjacent atoms. The diffusion time of a surface atom can be estimated by $ a r D [60].…”

Section: Resultsmentioning

confidence: 99%

Estimation of the activation energy for surface diffusion during metastable phase formation

et al. 2015

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“…Several monolayer (ML) thick liquid-like GB layers possessing high diffusivity were observed in the Cu-Bi [28][29][30][31], Al-Zn [26,27], Fe-Si-Zn [32][33][34][35] and W-Ni alloys [36,37]. GB liquid-like phase drastically influences also the GB segregation [29], GB mobility [38], GB energy and electrical resistivity [39,40]. The direct HREM evidence for thin GB films and triple junction ''pockets'' has been recently obtained in metallic W-Ni [36,37] and Al-Zn [26] alloys.…”

Section: Resultsmentioning

confidence: 99%

Wetting of grain boundaries in Al by the solid Al3Mg2 phase

Straumal

Baretzky²,

Kogtenkova

et al. 2009

J Mater Sci

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The microstructure of binary Al 100-x -Mg x (x = 10, 15, 18 and 25 wt%) alloys after long anneals (600-4000 h) was studied between 210 and 440°C. The transition from incomplete to complete wetting of Al/Al grain boundaries (GBs) by the second solid phase Al 3 Mg 2 has been observed. The portion of completely wetted GBs increases with increasing temperature beginning from T wsmin = 220°C. Above T wsmax = 410°C all Al/Al GBs are completely wetted by the Al 3 Mg 2 phase.

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“…Several authors have studied the Copper-Bismuth system and it is well-documented [1][2][3][4]. The low solubility of Bi (Bismuth) in a Cu (Copper) lattice (∼200 ppm) and the affinity of Bi to segregate make this system attractive for investigating basic segregation.…”

Section: Introductionmentioning

confidence: 99%

The Segregation of Bi and S from a Cu(Bi,S) Ternary System

Terblans

Swart

2009

e-J. Surf. Sci. Nanotechnol.

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In this paper the ternary segregation behaviour of Bi and S in a dilute Cu(Bi,S) polycrystalline crystal was investigated by using Auger electron spectroscopy to monitor the surface concentrations of Bi and S during constant temperature segregation measurements that were preformed in the temperature range 723 to 973 K at 50 K intervals. It was found that initially both Bi and S segregated to the surface. At first the segregation rate of S was higher than that of Bi. The Bi segregated to the surface until it reached a surface maximum concentration (2-6%) and subsequently the segregation rate of both S and Bi decreased and the Bi started to desegregate. The S replaced the Bi completely on the surface. Diffusion parameters, namely the activation energy (Q) and pre-exponential factor (D0) were determined for Bi as 181.6 kJ·mol −1 and 3.7 × 10 −5 m 2 ·s −1 , respectively. The S concentration in the crystal was unknown and the S segregation profiles were used to estimate the S concentration in the Cu crystal as 122 ± 12 ppm.

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Thermodynamic aspects of the grain boundary segregation in Cu(Bi) alloys

Cited by 113 publications

References 10 publications

Estimation of the activation energy for surface diffusion during metastable phase formation

Estimation of the activation energy for surface diffusion during metastable phase formation

Wetting of grain boundaries in Al by the solid Al3Mg2 phase

The Segregation of Bi and S from a Cu(Bi,S) Ternary System

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