|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||High Entropy Alloys VIII
||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-Ti. This phenomenon is used to probe experimentally the ordering behavior in Al15Hf25Sc10Ti25Zr25 HEA, which exhibits partial ordering at low temperatures. Both solute(Co) and self(Ti) 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