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Title: Outstanding Radiation Resistance of Tungsten-based High Entropy Alloys

Abstract

A novel 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 a simple body-centered cubic crystalline structure with certain black spots appearing after thermal annealing at elevated temperatures. Thorough analysis based on TEM and APT correlated the black spots with second phase particles rich in Cr and V. After both in situ and ex situ irradiation, these precipitates evolve to quasi-spherical particles with no sign of irradiation-created dislocation loops even after 8 dpa at either room temperature or 1073 K. Furthermore, nanomechanical testing shows a large hardness of 14 GPa in the as-deposited samples, with a slight increase after thermal annealing and almost negligible irradiation hardening. Theoretical modeling based on ab initio methodologies combined with 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. The fact that these alloys are suitable for bulk production coupled withmore » the exceptional radiation and mechanical properties makes them ideal structural materials for applications requiring extreme conditions.« less

Authors:
 [1];  [1];  [2]; ORCiD logo [3];  [1];  [1];  [4];  [4];  [5];  [1];  [1]
  1. Los Alamos National Laboratory
  2. Argonne National Laboratory
  3. BATTELLE (PACIFIC NW LAB)
  4. Warsaw University of Technology
  5. CCFE, United Kingdom Atomic Energy Authority
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1523246
Report Number(s):
PNNL-SA-137124
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Science Advances
Additional Journal Information:
Journal Volume: 5; Journal Issue: 3
Country of Publication:
United States
Language:
English

Citation Formats

El-Atwani, Osman, Li, N, Li, Meimei, Devaraj, Arun, Baldwin, J K., Schneider, M M., Sobieraj, D, Wrobel, J s., Nguyen-Manh, D, Maloy, Stuart A., and Martinez, E. Outstanding Radiation Resistance of Tungsten-based High Entropy Alloys. United States: N. p., 2019. Web. doi:10.1126/sciadv.aav2002.
El-Atwani, Osman, Li, N, Li, Meimei, Devaraj, Arun, Baldwin, J K., Schneider, M M., Sobieraj, D, Wrobel, J s., Nguyen-Manh, D, Maloy, Stuart A., & Martinez, E. Outstanding Radiation Resistance of Tungsten-based High Entropy Alloys. United States. doi:10.1126/sciadv.aav2002.
El-Atwani, Osman, Li, N, Li, Meimei, Devaraj, Arun, Baldwin, J K., Schneider, M M., Sobieraj, D, Wrobel, J s., Nguyen-Manh, D, Maloy, Stuart A., and Martinez, E. Fri . "Outstanding Radiation Resistance of Tungsten-based High Entropy Alloys". United States. doi:10.1126/sciadv.aav2002.
@article{osti_1523246,
title = {Outstanding Radiation Resistance of Tungsten-based High Entropy Alloys},
author = {El-Atwani, Osman and Li, N and Li, Meimei and Devaraj, Arun and Baldwin, J K. and Schneider, M M. and Sobieraj, D and Wrobel, J s. and Nguyen-Manh, D and Maloy, Stuart A. and Martinez, E},
abstractNote = {A novel 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 a simple body-centered cubic crystalline structure with certain black spots appearing after thermal annealing at elevated temperatures. Thorough analysis based on TEM and APT correlated the black spots with second phase particles rich in Cr and V. After both in situ and ex situ irradiation, these precipitates evolve to quasi-spherical particles with no sign of irradiation-created dislocation loops even after 8 dpa at either room temperature or 1073 K. Furthermore, nanomechanical testing shows a large hardness of 14 GPa in the as-deposited samples, with a slight increase after thermal annealing and almost negligible irradiation hardening. Theoretical modeling based on ab initio methodologies combined with 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. The fact that these alloys are suitable for bulk production coupled with the exceptional radiation and mechanical properties makes them ideal structural materials for applications requiring extreme conditions.},
doi = {10.1126/sciadv.aav2002},
journal = {Science Advances},
number = 3,
volume = 5,
place = {United States},
year = {2019},
month = {3}
}

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