The atomic-level tunability that results from alloying multiple transition metals with d electrons in concentrated solid solution alloys (CSAs), including high-entropy alloys (HEAs), has produced remarkable properties for advanced energy applications, in particular, damage resistance in high-radiation environments. The key to understanding CSAs radiation performance is quantitatively characterizing their complex local physical and chemical environments. In this study, the local structure of a FeCoNiCrPd HEA is quantitatively analyzed with X-ray total scattering and extended X-ray absorption fine structure methods. Compared to FeCoNiCr and FeCoNiCrMn, FeCoNiCrPd with a quasi-random alloy structure has a strong local lattice distortion, which effectively pins radiation-induced defects. Distinct from a relaxation behavior in FeCoNiCr and FeCoNiCrMn, ion irradiation further enhanced the local lattice distortion in FeCoNiCrPd due to a preference for forming Pd-Pd atomic pairs.
@article{arxiv.1707.07745,
title = {Probing local lattice distortion in medium- and high-entropy alloys},
author = {Y. Tong and G. Velisa and T. Yang and K. Jin and C. Lu and H. Bei and J. Y. P. Ko and D. C. Pagan and R. Huang and Y. Zhang and L. Wang and F. X. Zhang},
journal= {arXiv preprint arXiv:1707.07745},
year = {2017}
}