Outstanding Radiation Resistance of Tungsten-Based High-Entropy Alloys

O. El-Atwani,N. Li,M. Li,A. Devaraj,J. K. S. Baldwin,M. M. Schneider,D. Sobieraj,J. S. Wrobel,D. Nguyen-Manh,S. A. Maloy,E. Martinez

Science Advances（2019）

Los Alamos Natl Lab | Argonne Natl Lab | Pacific Northwest Natl Lab | Warsaw Univ Technol | United Kingdom Atom Energy Author

Cited 405|Views31

Abstract

A body-centered cubic W-based refractory high entropy alloy with outstanding radiation resistance has been developed. The alloy was grown as thin films showing a bimodal grain size distribution in the nanocrystalline and ultrafine regimes and a unique 4-nm lamella-like structure revealed by atom probe tomography (APT). Transmission electron microscopy (TEM) and x-ray diffraction show certain black spots appearing after thermal annealing at elevated temperatures. TEM and APT analysis correlated the black spots with second-phase particles rich in Cr and V. No sign of irradiation-created dislocation loops, even after 8 dpa, was observed. Furthermore, nanomechanical testing shows a large hardness of 14 GPa in the as-deposited samples, with near negligible irradiation hardening. Theoretical modeling combining ab initio and Monte Carlo techniques predicts the formation of Cr- and V-rich second-phase particles and points at equal mobilities of point defects as the origin of the exceptional radiation tolerance.

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Key words

Refractory Alloys,High-Entropy Alloys,Nanocrystalline Structures,Multi-Component Alloys,High-Temperature Corrosion

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