@article{97832e75fa4e4ae4be5d61ef3c12e9b1,
title = "Helium implantation damage resistance in nanocrystalline W-Ta-V-Cr high entropy alloys",
abstract = "Nanocrystalline W-Ta-Cr-V high entropy alloys have shown promising properties as nuclear fusion materials with enhanced radiation resistance to heavy ion irradiation and negligible radiation hardening. In this work, we investigate the performance of the alloy under low energy helium (He) implantation up to a fluence of 1.25 × 1017 cm−2 at 1223 K. We observe a uniform high density of very small (~2–3 nm) bubbles grown at a slow rate along with enhanced He bubble damage resistance, further marked by no preferential bubble formation on the grain boundaries, even at much higher fluences compared to previously implanted tungsten grades. First principle calculations of He formation and migration energies in this alloy indicate deep energetic wells on the potential landscape and low diffusivity of He compared to pure W. The results imply higher overall (considering both grain matrices and grain boundaries) implantation resistance due to slow He diffusion and accumulation, and confirm the enhanced vacancy-self interstitial recombination argument in these alloys.",
keywords = "Electron microscopy, He bubbles, HEA, In-situ TEM, Migration energy",
author = "O. El-Atwani and A. Alvarado and K. Unal and S. Fensin and Hinks, {J. A.} and G. Greaves and Baldwin, {J. K.S.} and Maloy, {S. A.} and E. Martinez",
note = "Funding Information: Research presented in this article was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory under project number 20160674PRD3. The authors would also like to thank EPSRC for the funding of the MIAMI facility through grant EP/M028283/1. EM acknowledge support by the U.S. Department of Energy , Office of Science , Office of Fusion Energy Sciences , and Office of Advanced Scientific Computing Research through the Scientific Discovery through Advanced Computing (SciDAC) project on Plasma–Surface Interactions under Award No. DE-SC0008875. This work was supported by the U.S. Department of Energy through the Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001). Publisher Copyright: {\textcopyright} 2020 Copyright: Copyright 2021 Elsevier B.V., All rights reserved.",
year = "2021",
month = mar,
day = "1",
doi = "10.1016/j.mtener.2020.100599",
language = "English",
volume = "19",
journal = "Materials Today Energy",
issn = "2468-6069",
publisher = "Elsevier Limited",
}
