|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||J-127: Solute and Self-diffusion in HCP High Entropy Alloys
||Sandipan Sen, Mayur Vaidya, Xi Zhang, Lukasz Rogal, Blazej Grabowski, Gerhard Wilde, Sergiy Divinski
|On-Site Speaker (Planned)
For the first time, diffusion in HCP HEAs is investigated using tracer technique. Solute diffusion (Co) and self-diffusion (Ti) are studied in HfZr, HfZrTi, Al5Hf25Sc20Ti25Zr25 and Al15Hf25Sc10Ti25Zr25 alloys in the temperature range of 400°C-1100 ⁰C. The impact of increasing number of elements and of Al-content in quinary alloys on the diffusion behavior is examined. The alloys were prepared from 99.99% purity elements in an arc-melting furnace with a water-cooled copper plate under a protective Ar atmosphere. X-ray diffraction confirms the presence of a single-phase HCP structure.
Ultra-fast diffusion of Co is highlighted for these alloys, similar to observations for α-Zr. Both solute(Co) and self(Zr) diffusion rates decrease with increasing of number of elements, when compared on the homologous temperature scale. The experimental findings are explained by utilizing density-functional-theory-based calculations.
||Planned: Supplemental Proceedings volume; Planned: Supplemental Proceedings volume