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Title: Influence of chemical disorder on energy dissipation and defect evolution in advanced alloys

Journal Article · · Journal of Materials Research
DOI:https://doi.org/10.1557/jmr.2016.269· OSTI ID:1866534
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [1];  [1];  [4];  [1];  [3];  [5];  [5];  [1];  [1];  [6];  [7];  [8]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States)
  4. Univ. of Wyoming, Laramie, WY (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  6. Univ. of Wisconsin, Madison, WI (United States)
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  8. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

We report that historically, alloy development with better radiation performance has been focused on traditional alloys with one or two principal element(s) and minor alloying elements, where enhanced radiation resistance depends on microstructural or nanoscale features to mitigate displacement damage. In sharp contrast to traditional alloys, recent advances of single-phase concentrated solid solution alloys (SP-CSAs) have opened up new frontiers in materials research. In these alloys, a random arrangement of multiple elemental species on a crystalline lattice results in disordered local chemical environments and unique site-to-site lattice distortions. Based on closely integrated computational and experimental studies using a novel set of SP-CSAs in a face-centered cubic structure, we have explicitly demonstrated that increasing chemical disorder can lead to a substantial reduction in electron mean free paths, as well as electrical and thermal conductivity, which results in slower heat dissipation in SP-CSAs. The chemical disorder also has a significant impact on defect evolution under ion irradiation. Considerable improvement in radiation resistance is observed with increasing chemical disorder at electronic and atomic levels. Finally, the insights into defect dynamics may provide a basis for understanding elemental effects on evolution of radiation damage in irradiated materials and may inspire new design principles of radiation-tolerant structural alloys for advanced energy systems.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-07NA27344; AC05-00OR22725; AC02-05CH11231
OSTI ID:
1866534
Alternate ID(s):
OSTI ID: 1319193
Report Number(s):
LLNL-JRNL-834139; 1031874; TRN: US2306056
Journal Information:
Journal of Materials Research, Vol. 31, Issue 16; ISSN 0884-2914
Publisher:
Materials Research SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Cited By (12)

First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy text January 2019
Effect of atomic order/disorder on Cr segregation in Ni-Fe alloys journal September 2018
Core Electrons in the Electronic Stopping of Heavy Ions journal September 2018
Atomistic simulation of defect-dislocation interactions in concentrated solid-solution alloys journal October 2019
Radiation stability of nanocrystalline single-phase multicomponent alloys journal February 2019
Tensile mechanical performance of Ni–Co alloy nanowires by molecular dynamics simulation journal January 2019
Model interatomic potentials and lattice strain in a high-entropy alloy journal August 2018
Unique Challenges for Modeling Defect Dynamics in Concentrated Solid-Solution Alloys journal July 2017
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys [Supplementary Data] preprint December 2017
Effect of d electrons on defect properties in equiatomic NiCoCr and NiCoFeCr concentrated solid solution alloys journal January 2018
Enhanced void swelling in NiCoFeCrPd high-entropy alloy by indentation-induced dislocations journal August 2018
Effects of chemical alternation on damage accumulation in concentrated solid-solution alloys journal June 2017

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