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Title: Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys

Journal Article · · Current Opinion in Solid State and Materials Science
 [1];  [2];  [3];  [4]; ORCiD logo [4];  [5]
  1. Oak Ridge National Laboratory. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division; The University of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering
  2. Oak Ridge National Laboratory. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. The University of Tennessee, Knoxville, TN (United States). Department of Materials Science and Engineering; Oak Ridge National Laboratory. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  4. University of Helsinki (Finland). Department of Physics
  5. University of Helsinki (Finland). Department of Physics, Helsinki Institute of Physics;

Performance enhancement of structural materials in extreme radiation environments has been activelyinvestigated for many decades. Traditional alloys, such as steel, brass and aluminum alloys, normallycontain one or two principal element(s) with a low concentration of other elements. While these existin either a mixture of metallic phases (multiple phases) or in a solid solution (single phase), limited orlocalized chemical disorder is a common characteristic of the main matrix. Fundamentally different fromtraditional alloys, recently developed single-phase concentrated solid-solutio n alloys (CSAs) contain mul-tiple elemental species in equiatomic or high concentrations with different elements randomly arrangedon a crystalline lattice. Due to the lack of ordered elemental arrangement in these CSAs, they exhibit sig-nificant chemical disorder and unique site-to-site lattice distortion. While it is well recognized intraditional alloys that minor additions lead to enhanced radiation resistance, it remains unclear inCSAs how atomic-level heterogeneity affects defect formation, damage accumulation, and microstruc-tural evolution. These knowledge gaps have acted as roadblocks to the development of future-generation energy technology. CSAs with a simple crystal structure, but complex chemical disorder,are unique systems that allow us, through replacing principal alloying elements and modifying concen-trations, to study how compositional complexity influences defect dynamics, and to bridge the knowl-edge gaps through understanding intricate electronic- and atomic-level interactions, mass and energytransfer processes, and radiation resistance performance. Recent advances in defect dynamics and irradi-ation performance of CSAs are reviewed, intrinsic chemical effects on radiation performance arediscussed, and direction for future studies is suggested.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
DOE Contract Number:
AC02-05CH11231
OSTI ID:
1463271
Journal Information:
Current Opinion in Solid State and Materials Science, Vol. 21, Issue 5; ISSN 1359-0286
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

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Cited By (18)

Unique Challenges for Modeling Defect Dynamics in Concentrated Solid-Solution Alloys journal July 2017
Defect-mediated electron–hole separation in semiconductor photocatalysis journal January 2018
First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy journal February 2019
Critical Review of Chemical Complexity Effect on Local Structure of Multi-principal-Element Alloys journal August 2019
Local-environment dependence of stacking fault energies in concentrated solid-solution alloys journal February 2019
Atomistic simulation of defect-dislocation interactions in concentrated solid-solution alloys journal October 2019
Effect of atomic order/disorder on Cr segregation in Ni-Fe alloys journal September 2018
Breakthrough applications of high-entropy materials journal August 2018
Effect of d electrons on defect properties in equiatomic NiCoCr and NiCoFeCr concentrated solid solution alloys journal January 2018
Irradiation responses and defect behavior of single-phase concentrated solid solution alloys journal September 2018
Influence of compositional complexity on interdiffusion in Ni-containing concentrated solid-solution alloys journal March 2018
Model interatomic potentials and lattice strain in a high-entropy alloy journal August 2018
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys text January 2017
Influence of compositional complexity on interdiffusion in Ni-containing concentrated solid-solution alloys [Supplemental Data] dataset March 2018
First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy text January 2019
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys [Supplementary Data] preprint December 2017
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys journal December 2017
First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy text January 2019

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