Zero-flux planes and flux reversals in Cu−Ni−Zn diffusion couples

Dayananda, M. A.; Kim, C. W.

doi:10.1007/bf02811989

Cited by 148 publications

(81 citation statements)

References 20 publications

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“…These diffusional interactions may be manifested in terms of regions of uphill diffusion and zero flux planes, and can enhance or reduce the diffusion of an element. 11,12 Thus, understanding diffusional interactions in HEA's is essential in order to explain the sluggish kinetics observed in these alloys.…”

Section: Introductionmentioning

confidence: 99%

Investigations of quaternary interdiffusion in a constituent system of high entropy alloys

Kulkarni

Chauhan

2015

AIP Advances

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Interdiffusion was investigated at 1000°C in a quaternary Fe-Ni-Co-Cr system, which is an essential constituent of many high-entropy alloys. The relative values of main and cross interdiffusion coefficients determined from concentrations and interdiffusion fluxes developed in a single diffusion couple indicate that significant diffusional interactions exist in this system. Thermodynamic interactions between the binary constituents were analyzed based on the activity coefficient relations and it is shown that the observed diffusional interactions of a component with others are consistent with relative thermodynamic interactions between them.

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Section: Introductionmentioning

confidence: 99%

Investigations of quaternary interdiffusion in a constituent system of high entropy alloys

Kulkarni

Chauhan

2015

AIP Advances

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“…The interdiffusion coefficients are functions of composition and are usually evaluated from infinite or semi-infinite diffusion couple experiments. In such a diffusion couple experiment, the interdiffusion fluxJ i can be evaluated at any point x directly from the experimental concentration profiles of the elements by using the following equation [14] :…”

Section: Introductionmentioning

confidence: 99%

Interdiffusion and Phase Growth Kinetics in Magnesium-Aluminum Binary System

Kulkarni

Luo

2013

J. Phase Equilib. Diffus.

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Binary interdiffusion data as functions of composition in the Mg-Al system are essential in modeling kinetics of phase transformations in multicomponent Mg and Al alloys. Interdiffusion and phase growth kinetics were studied in the binary Mg-Al system using multiphase diffusion couples assembled between pure Mg and pure Al at 380, 400 and 420°C. Two phases, Al 3 Mg 2 (b) and Mg 17 Al 12 (c) were formed between Al and Mg at the three temperatures studied. Both b and c phases were observed to follow parabolic growth with time, which suggests that the growth of the two phases is controlled by bulk diffusion mechanisms. The activation energies for the growth of b and c phases in the temperature range of 380-420°C were found to be 37.3 ± 4.1 and 187.7 ± 1.9 kJ/mol, respectively. The interdiffusion coefficients were evaluated as functions of compositions in various phases at the three temperatures studied, which were further utilized for evaluating the activation energies and frequency factors for interdiffusion in each phase. The activation energy for interdiffusion in FCC-Al is found to increase with increasing Mg-content whereas the activation energies for interdiffusion in HCP-Mg and c phases do not vary significantly with composition.

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“…%) concentrations. The interdiffusion fluxes of individual components may be determined directly from their concentration profiles by: [81] where is the interdiffusion flux of component i in an n component system, t is the diffusion anneal time and is the concentration of component i. The profile of interdiffusion flux for a component can be integrated with respect to distance, and this accumulated interdiffusion flux for a component can be defined as integrated interdiffusion coefficients, , over a selected region, x 1 from x 2 , as:…”

Section: Diffusion Couples Annealed At 600°c For 24 Hoursmentioning

confidence: 99%

Results of U-xMo (x=7, 10, 12 wt.%) Alloy versus Al-6061 Cladding Diffusion Couple Experiments Performed at 500, 550 and 600 Degrees C

Perez¹,

Keiser²,

Sohn³

2013

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The Reduced Enrichment for Research and Test Reactors (RERTR) program has been developing low-enrichment fuel systems encased in Al-6061 for use in research and test reactors. U-Mo alloys in contact with Al and Al alloys can undergo diffusional interactions that can result in the development of interdiffusion zones with complex fine-grained microstructures composed of multiple phases. A monolithic fuel currently being developed by the RERTR program has local regions where the U-Mo fuel plate is in contact with the Al-6061 cladding and, as a result, the program finds information about interdiffusion zone development at high temperatures of interest. In this study, the microstructural development of diffusion couples consisting of U-7wt.%Mo, U-10wt.%Mo, and U-12wt.%Mo vs. Al-6061 (or 6061 aluminum) cladding, annealed at 500, 550, 600°C for 1, 5, 20, 24, or 132 hours, was analyzed by backscatter electron microscopy and x-ray energy dispersive spectroscopy on a scanning electron microscope. Concentration profiles were determined by standardized wavelength dispersive spectroscopy and standardless x-ray energy dispersive spectroscopy. The results of this work shows that the presence of surface layers at the U-Mo/Al-6061 interface can dramatically impact the overall interdiffusion behavior in terms of rate of interaction and uniformity of the developed interdiffusion zones. It further reveals that relatively uniform interaction layers with higher Si concentrations can develop in U-Mo/Al-6061 couples annealed at shorter times and that longer times at temperature result in the development of more non-uniform interaction layers with more areas that are enriched in Al. At longer annealing times and relatively high temperatures, UMo/Al-6061 couples can exhibit more interaction compared to U-Mo/pure Al couples. The minor alloying constituents in Al-6061 cladding can result in the development of many complex phases in the interaction layer of U-Mo/Al-6061 cladding couples, and some phases in the interdiffusion zones of U-Mo/Al-6061 cladding couples are likely similar to those observed for U-Mo/pure Al couples.

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Zero-flux planes and flux reversals in Cu−Ni−Zn diffusion couples

Cited by 148 publications

References 20 publications

Investigations of quaternary interdiffusion in a constituent system of high entropy alloys

Investigations of quaternary interdiffusion in a constituent system of high entropy alloys

Interdiffusion and Phase Growth Kinetics in Magnesium-Aluminum Binary System

Results of U-xMo (x=7, 10, 12 wt.%) Alloy versus Al-6061 Cladding Diffusion Couple Experiments Performed at 500, 550 and 600 Degrees C

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