About this Abstract |
Meeting |
2nd World Congress on High Entropy Alloys (HEA 2021)
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Symposium
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2nd World Congress on High Entropy Alloys (HEA 2021)
|
Presentation Title |
ON DEMAND: Experimental Determination of Interdiffusion and Defect Kinetics in Multicomponent Systems |
Author(s) |
Susanta Kumar Nayak, Somanath Danayak, Kaustubh N. Kulkarni |
On-Site Speaker (Planned) |
Kaustubh N. Kulkarni |
Abstract Scope |
‘Sluggish diffusion’ is probably the most debated aspect of the high entropy alloys in the literature over past one decade or so. Although rigorous experimental data on diffusion is required to settle this debate, the efforts done on the evaluation of meaningful diffusion parameters have been not much. The presentation will start with an overview of available literature on diffusion in the field of high entropy alloys and go on to explain the significance of classical interdiffusion studies in designing the compositions and applications of this class of materials. Experimental determination of interdiffusion coefficients as carried out in quinary and quaternary systems using body-diagonal diffusion couple approach will be discussed. Moreover, vacancies play important role in diffusion mechanisms in high entropy alloys and hence, the availability of data on energetics of vacancy formation and migration is crucial while addressing the issue of sluggish or non-sluggish diffusion in these alloys. The experimental determination of vacancy formation energies conducted in the binary Fe-Ni, quaternary Fe-Ni- Co-Cr and quinary Fe-Ni-Co-Cr-Mn systems will be presented. Such vacancy-formation energy data combined with experimental tracer diffusivity data available in the literature also helps in getting insights into the migration kinetics and diffusion mechanisms. |
Proceedings Inclusion? |
Undecided |