Diffusion of Al26 and Mn54 in Aluminum

Lundy, T.S.; Murdock, J. F.

doi:10.1063/1.1728808

Cited by 455 publications

(94 citation statements)

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“…This value compares well with the experimentally reported values which range between 120.4 and 144.4 kJ/mol. [40][41][42][43][44][45] It is known that both GGA and LDA functionals tend to underestimate the surface energy. 46 This fact was recently used to correct the vacancy formation energy 47 and vacancy migration energy.…”

Section: Resultsmentioning

confidence: 99%

Impurity diffusion activation energies in Al from first principles

2009

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Activation energies for vacancy-mediated impurity diffusion in face-centered-cubic aluminum have been computed ab initio for all technologically important alloying elements, as well as for most of the lanthanides. The so-called five-frequency rate model is used to establish the limiting vacancy interchange process. Many elements were shown to be limited by Al-vacancy interchanges. For these elements we showed that the diffusion activation energy is rather close to that for Al self-diffusion, and additionally the diffusion preexponential factor is of the same order as that for Al self-diffusion. The diffusion activation energy is shown to exhibit a linear relation with the solute partial molar volume in Al. In contrast, transition metals are shown to deviate strongly from these generalities. Diffusion of transition-metal atoms is limited by solute-vacancy interchanges that require remarkably high activation energies. Transition-metal diffusivities in Al show strong trends with the number of d-valence electrons but not with partial molar volume.

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Section: Resultsmentioning

confidence: 99%

Impurity diffusion activation energies in Al from first principles

2009

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“…Al can be considered as a model system as there exists comprehensive defect data collected over more than five decades [30][31][32][33][34]. In a previous study Varotsos and Alexopoulos [19] employed the cBΩ model for self-diffusion in Al indicating that it can be described with a single diffusion mechanism and a = 0.17357 in the temperature range 673-916 K.…”

Section: A Backgroundmentioning

confidence: 99%

Germanium diffusion in aluminium: connection between point defect parameters with bulk properties

Ganniari-Papageorgiou

Fitzpatrick

Chroneos

2015

J Mater Sci: Mater Electron

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The understanding of dopant diffusion and its temperature dependance is technologically important in metals. As a model system we consider germanium diffusion in aluminium. This is an appropriate system as germanium does not form intermetallic compounds in aluminium and therefore it simplifies the investigation of its diffusion behavior. Here we use experimental elastic and expansivity data to derive the germanium diffusion coefficient in aluminium in the framework of the so-called cBΩ model, between 673 K to 883 K. This model is a powerful way to study point defect parameters in metals as it connects them to bulk properties, which are more easily accessible. The calculated diffusivities are in excellent agreement with the experimental data.

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“…Two of them (γ'-Ni 3 Al and β-NiAl) were considered in this calculation. The data used in simulations are shown in Table 1 [27,28,29].…”

Section: In This Work the Interdiffusion Coefficientmentioning

confidence: 99%

The Ni-Al-Hf Multiphase Diffusion

Romanowska

Wierzba

Markowski

et al. 2016

Archives of Metallurgy and Materials

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The generalized Darken method was applied to simulate the diffusion between γ-Ni| γ'-Ni3Al and γ'-Ni3Al|β-NiAl interfaces. The results of calculations were compared with the experimental concentration's profiles of nickel, aluminum and hafnium in aluminide and hafnium doped aluminide coatings deposited by the CVD and PVD methods on pure nickel. The method deals with the Wagner's integral diffusion coefficients and thermodynamic data -activities of components. The experimental results agree with the simulated ones.

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Diffusion of Al26 and Mn54 in Aluminum

Cited by 455 publications

References 5 publications

Impurity diffusion activation energies in Al from first principles

Impurity diffusion activation energies in Al from first principles

Germanium diffusion in aluminium: connection between point defect parameters with bulk properties

The Ni-Al-Hf Multiphase Diffusion

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