Outstanding radiation resistance of tungsten-based high-entropy alloys

Osman El-Atwani , Li Nan , Li Meimei , Arun Devaraj , Jon K.S. Baldwin , M. M. Schneider , D. Sobieraj , Jan Wróbel , D. Nguyen-Manh , S. A. Maloy , E. Martinez

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.
Author Osman El-Atwani - Los Alamos National Laboratory
Osman El-Atwani,,
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, Li Nan - Los Alamos National Laboratory
Li Nan,,
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, Li Meimei - Argonne National Laboratory
Li Meimei,,
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, Arun Devaraj - Pacific Northwest National Laboratory
Arun Devaraj,,
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, Jon K.S. Baldwin - Los Alamos National Laboratory
Jon K.S. Baldwin,,
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, M. M. Schneider
M. M. Schneider,,
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, D. Sobieraj
D. Sobieraj,,
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, Jan Wróbel (FMSE / DMD)
Jan Wróbel,,
- Division of Materials Design
, D. Nguyen-Manh - Culham Science Centre for Fusion Energy
D. Nguyen-Manh,,
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, S. A. Maloy
S. A. Maloy,,
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et al.`
Journal seriesScience Advances, ISSN , e-ISSN 2375-2548, (0 pkt)
Issue year2019
Vol5
No3
Pages1-9
Publication size in sheets100.1
Keywords in PolishStopy o wysokiej entropii, właściwości radiacyjne, tomografia sondy atomowej, transmisyjna mikroskopia elektronowa, modelowanie ab initio, symulacje Monte Carlo
Keywords in Englishhigh-entropy alloys, radiation properties, atom probe tomography, transmission electron microscope, ab initio modelling, Monte Carlo simulations
DOIDOI:10.1126/sciadv.aav2002
URL https://advances.sciencemag.org/content/5/3/eaav2002
Languageen angielski
File
outstanding radiation.pdf 7.35 MB
Score (nominal)0
ScoreMinisterial score = 0.0, 10-05-2019, ArticleFromJournal
Citation count*2 (2019-08-13)
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