Interdiffusion in the FCC-structured Al-Co-Cr-Fe-Ni high entropy alloys: Experimental studies and numerical simulations

A group of Al-Co-Cr-Fe-Ni alloys was synthesized for diffusion couple experiments that were performed in the temperature range of 1273–1373 K. The measured concentrations profiles were used to determine the tracer diffusion coefficients of the components, using Darken - Manning approach coupled with...

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Bibliographic Details
Published in:Journal of alloys and compounds 2016-07, Vol.674, p.455-462
Main Authors: Dąbrowa, Juliusz, Kucza, Witold, Cieślak, Grzegorz, Kulik, Tadeusz, Danielewski, Marek, Yeh, Jien-Wei
Format: Article
Language:English
Subjects:
Alloys
Computer simulation
Diffusion
Diffusion coefficient
Entropy
High entropy alloys
Interdiffusion
Mathematical models
Optimization
Simulation
Tracer diffusion
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Summary:A group of Al-Co-Cr-Fe-Ni alloys was synthesized for diffusion couple experiments that were performed in the temperature range of 1273–1373 K. The measured concentrations profiles were used to determine the tracer diffusion coefficients of the components, using Darken - Manning approach coupled with Levenberg–Marquardt or genetic algorithm methods of optimization. The approach was also validated against literature data obtained for diffusion in Co-Cr-Fe-Ni-Mn alloys. The results for both systems confirm the theory of sluggish diffusion in High Entropy Alloys, with the values of diffusion coefficients being significantly lower than in the case of conventional alloys. [Display omitted] •The first experimental results for diffusion in Al-Co-Cr-Fe-Ni HEAs are presented.•Combinatorial approach is used to simultaneous determination of five diffusivities.•Values of diffusion coefficients are similar to those calculated for Co-Cr-Fe-Mn-Ni.•Decrease of activation energies of diffusion is observed due to Al presence.•Obtained results confirm the sluggish diffusion effect in HEAs.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2016.03.046