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Title: Evolution of local lattice distortion under irradiation in medium- and high-entropy alloys

Abstract

Here, a major challenge for future nuclear reactors is to design nuclear materials that can sustain extremely prolonged radiation damage. Local lattice distortion, considered as a core effect of high-entropy alloys (HEAs), can suppress the growth of radiation defects to control radiation performance. However, local lattice distortion in HEAs is rarely quantitatively measured. Here we employed total scattering technique to study the local structure of the face-centered cubic (fcc) equiatomic FeCoNiCr MEA, and FeCoNiCrMn and FeCoNiCrPd HEAs before and after ion irradiation. Their local lattice distortions were quantitatively evaluated based on the difference of lattice constant between the local structure and the average structure. We revealed that the mean local lattice distortion in the pristine samples varies in the following order: FeCoNiCr < FeCoNiCrMn < FeCoNiCrPd. Density functional theory (DFT) calculations further unveiled that the fluctuation of local distortions in FeCoNiCr and FeCoNiCrMn is less than 5%, whereas the highest bond-length fluctuation in FeCoNiCrPd can approach to 8%. Under irradiation the mean local lattice distortion in FeCoNiCr and FeCoNiCrMn evolves differently from FeCoNiCrPd by showing a relaxation behavior at low dose. And the impact of local lattice distortion on dislocation loops after a prolonged ion-irradiation was investigated by transmission electronmore » microscope (TEM) and the underlying mechanism was discussed.« less

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [2]; ORCiD logo [1];  [2]; ORCiD logo [1];  [3];  [3]; ORCiD logo [4];  [2]; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. Cornell Univ., Ithaca, NY (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1460240
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Materialia
Additional Journal Information:
Journal Volume: 2; Journal ID: ISSN 2589-1529
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; High-entropy alloys; Lattice distortion; Pair distribution function; Ion irradiation; Density functional theory calculation

Citation Formats

Tong, Yang, Velisa, Gihan, Zhao, Shiteng, Guo, Wei, Yang, Taini, Jin, Ke, Lu, Chenyang, Bei, Hongbin, Ko, J. Y. P., Pagan, D. C., Zhang, Yanwen, Wang, Lumin, and Zhang, F. X. Evolution of local lattice distortion under irradiation in medium- and high-entropy alloys. United States: N. p., 2018. Web. doi:10.1016/j.mtla.2018.06.008.
Tong, Yang, Velisa, Gihan, Zhao, Shiteng, Guo, Wei, Yang, Taini, Jin, Ke, Lu, Chenyang, Bei, Hongbin, Ko, J. Y. P., Pagan, D. C., Zhang, Yanwen, Wang, Lumin, & Zhang, F. X. Evolution of local lattice distortion under irradiation in medium- and high-entropy alloys. United States. doi:10.1016/j.mtla.2018.06.008.
Tong, Yang, Velisa, Gihan, Zhao, Shiteng, Guo, Wei, Yang, Taini, Jin, Ke, Lu, Chenyang, Bei, Hongbin, Ko, J. Y. P., Pagan, D. C., Zhang, Yanwen, Wang, Lumin, and Zhang, F. X. Wed . "Evolution of local lattice distortion under irradiation in medium- and high-entropy alloys". United States. doi:10.1016/j.mtla.2018.06.008. https://www.osti.gov/servlets/purl/1460240.
@article{osti_1460240,
title = {Evolution of local lattice distortion under irradiation in medium- and high-entropy alloys},
author = {Tong, Yang and Velisa, Gihan and Zhao, Shiteng and Guo, Wei and Yang, Taini and Jin, Ke and Lu, Chenyang and Bei, Hongbin and Ko, J. Y. P. and Pagan, D. C. and Zhang, Yanwen and Wang, Lumin and Zhang, F. X.},
abstractNote = {Here, a major challenge for future nuclear reactors is to design nuclear materials that can sustain extremely prolonged radiation damage. Local lattice distortion, considered as a core effect of high-entropy alloys (HEAs), can suppress the growth of radiation defects to control radiation performance. However, local lattice distortion in HEAs is rarely quantitatively measured. Here we employed total scattering technique to study the local structure of the face-centered cubic (fcc) equiatomic FeCoNiCr MEA, and FeCoNiCrMn and FeCoNiCrPd HEAs before and after ion irradiation. Their local lattice distortions were quantitatively evaluated based on the difference of lattice constant between the local structure and the average structure. We revealed that the mean local lattice distortion in the pristine samples varies in the following order: FeCoNiCr < FeCoNiCrMn < FeCoNiCrPd. Density functional theory (DFT) calculations further unveiled that the fluctuation of local distortions in FeCoNiCr and FeCoNiCrMn is less than 5%, whereas the highest bond-length fluctuation in FeCoNiCrPd can approach to 8%. Under irradiation the mean local lattice distortion in FeCoNiCr and FeCoNiCrMn evolves differently from FeCoNiCrPd by showing a relaxation behavior at low dose. And the impact of local lattice distortion on dislocation loops after a prolonged ion-irradiation was investigated by transmission electron microscope (TEM) and the underlying mechanism was discussed.},
doi = {10.1016/j.mtla.2018.06.008},
journal = {Materialia},
number = ,
volume = 2,
place = {United States},
year = {2018},
month = {6}
}

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