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Title: Dislocation loop evolution and radiation hardening in nickel-based concentrated solid solution alloys

Abstract

Effects of chemical composition, ion irradiation dose and temperature on unfaulting of irradiation induced Frank dislocation loops to perfect loops in two nickel based single-phase solid solution alloys, Ni–20Fe and NiFe–20Cr, have been studied. The fraction of Frank loops decreases with irradiation dose from 7.2 to 38.4 dpa at 500°C, but with more Frank loops remaining in the ternary alloy. However, perfect loops and dislocation networks become the dominant features of defects at 580°C in both alloys. The results indicate a thermally assisted loop unfaulting process that may be hindered by more sluggish defect motion in the alloy with more chemical components. Nano-indentation with both continuous stiffness method and single indentation method are used to measure radiation hardening. Loop unfaulting in both alloys irradiated at 580°C reduced radiation hardening while significant hardening is observed after irradiation at 500°C. The quasi-static single indentation method exhibits lower hardness results compared to continuous stiffness method, because dislocations induced from the cyclic loading in the latter method get relaxed and stabilized, resulting in higher resistance to the indenter.

Authors:
 [1]; ORCiD logo [2];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4];  [1]
+ Show Author Affiliations
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1694365
Alternate Identifier(s):
OSTI ID: 1637409
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 538; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Xiu, Pengyuan, Osetskiy, Yury N., Jiang, Li, Velisa, Gihan, Tong, Yang, Bei, Hongbin, Weber, William, Zhang, Yanwen, and Wang, Lumin. Dislocation loop evolution and radiation hardening in nickel-based concentrated solid solution alloys. United States: N. p., 2020. Web. doi:10.1016/j.jnucmat.2020.152247.
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Xiu, Pengyuan, Osetskiy, Yury N., Jiang, Li, Velisa, Gihan, Tong, Yang, Bei, Hongbin, Weber, William, Zhang, Yanwen, & Wang, Lumin. Dislocation loop evolution and radiation hardening in nickel-based concentrated solid solution alloys. United States. https://doi.org/10.1016/j.jnucmat.2020.152247
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Xiu, Pengyuan, Osetskiy, Yury N., Jiang, Li, Velisa, Gihan, Tong, Yang, Bei, Hongbin, Weber, William, Zhang, Yanwen, and Wang, Lumin. Tue . "Dislocation loop evolution and radiation hardening in nickel-based concentrated solid solution alloys". United States. https://doi.org/10.1016/j.jnucmat.2020.152247. https://www.osti.gov/servlets/purl/1694365.
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@article{osti_1694365,
title = {Dislocation loop evolution and radiation hardening in nickel-based concentrated solid solution alloys},
author = {Xiu, Pengyuan and Osetskiy, Yury N. and Jiang, Li and Velisa, Gihan and Tong, Yang and Bei, Hongbin and Weber, William and Zhang, Yanwen and Wang, Lumin},
abstractNote = {Effects of chemical composition, ion irradiation dose and temperature on unfaulting of irradiation induced Frank dislocation loops to perfect loops in two nickel based single-phase solid solution alloys, Ni–20Fe and NiFe–20Cr, have been studied. The fraction of Frank loops decreases with irradiation dose from 7.2 to 38.4 dpa at 500°C, but with more Frank loops remaining in the ternary alloy. However, perfect loops and dislocation networks become the dominant features of defects at 580°C in both alloys. The results indicate a thermally assisted loop unfaulting process that may be hindered by more sluggish defect motion in the alloy with more chemical components. Nano-indentation with both continuous stiffness method and single indentation method are used to measure radiation hardening. Loop unfaulting in both alloys irradiated at 580°C reduced radiation hardening while significant hardening is observed after irradiation at 500°C. The quasi-static single indentation method exhibits lower hardness results compared to continuous stiffness method, because dislocations induced from the cyclic loading in the latter method get relaxed and stabilized, resulting in higher resistance to the indenter.},
doi = {10.1016/j.jnucmat.2020.152247},
journal = {Journal of Nuclear Materials},
number = ,
volume = 538,
place = {United States},
year = {Tue Sep 01 00:00:00 EDT 2020},
month = {Tue Sep 01 00:00:00 EDT 2020}
}
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https://doi.org/10.1016/j.jnucmat.2020.152247
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