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

Abstract

Performance enhancement of structural materials in extreme radiation environments has been actively investigated for many decades. Traditional alloys, such as steel, brass and aluminum alloys, normally contain one or two principal element(s) with a low concentration of other elements. While these exist in either a mixture of metallic phases (multiple phases) or in a solid solution (single phase), limited or localized chemical disorder is a common characteristic of the main matrix. Fundamentally different from traditional alloys, recently developed single-phase concentrated solid-solution alloys (CSAs) contain multiple elemental species in equiatomic or high concentrations with different elements randomly arranged on a crystalline lattice. Due to the lack of ordered elemental arrangement in these CSAs, they exhibit significant chemical disorder and unique site-to-site lattice distortion. While it is well recognized in traditional alloys that minor additions lead to enhanced radiation resistance, it remains unclear in CSAs how atomic-level heterogeneity affects defect formation, damage accumulation, and microstructural 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 concentrations, to study how compositional complexity influences defect dynamics,more » and to bridge the knowledge gaps through understanding intricate electronic- and atomic-level interactions, mass and energy transfer processes, and radiation resistance performance. As a result, recent advances in defect dynamics and irradiation performance of CSAs are reviewed, intrinsic chemical effects on radiation performance are discussed, and direction for future studies is suggested.« less

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3];  [4]; ORCiD logo [4];  [4]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); The Univ. of Tennessee, Knoxville, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. The Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Univ. of Helsinki (Finland)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)
Sponsoring Org.:
USDOE
OSTI Identifier:
1458384
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Current Opinion in Solid State and Materials Science
Additional Journal Information:
Journal Volume: 21; Journal Issue: 5; Journal ID: ISSN 1359-0286
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Chemical disorder; Concentrated solid-solution alloys; Lattice distortion; Energy landscapes; Defect dynamics; Microstructure evolution; Irradiation effects

Citation Formats

Zhang, Yanwen, Zhao, Shijun, Weber, William J., Nordlund, Kai, Granberg, Fredric, and Djurabekova, Flyura. Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys. United States: N. p., 2017. Web. doi:10.1016/j.cossms.2017.02.002.
Zhang, Yanwen, Zhao, Shijun, Weber, William J., Nordlund, Kai, Granberg, Fredric, & Djurabekova, Flyura. Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys. United States. https://doi.org/10.1016/j.cossms.2017.02.002
Zhang, Yanwen, Zhao, Shijun, Weber, William J., Nordlund, Kai, Granberg, Fredric, and Djurabekova, Flyura. Sat . "Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys". United States. https://doi.org/10.1016/j.cossms.2017.02.002. https://www.osti.gov/servlets/purl/1458384.
@article{osti_1458384,
title = {Atomic-level heterogeneity and defect dynamics in concentrated solid-solution alloys},
author = {Zhang, Yanwen and Zhao, Shijun and Weber, William J. and Nordlund, Kai and Granberg, Fredric and Djurabekova, Flyura},
abstractNote = {Performance enhancement of structural materials in extreme radiation environments has been actively investigated for many decades. Traditional alloys, such as steel, brass and aluminum alloys, normally contain one or two principal element(s) with a low concentration of other elements. While these exist in either a mixture of metallic phases (multiple phases) or in a solid solution (single phase), limited or localized chemical disorder is a common characteristic of the main matrix. Fundamentally different from traditional alloys, recently developed single-phase concentrated solid-solution alloys (CSAs) contain multiple elemental species in equiatomic or high concentrations with different elements randomly arranged on a crystalline lattice. Due to the lack of ordered elemental arrangement in these CSAs, they exhibit significant chemical disorder and unique site-to-site lattice distortion. While it is well recognized in traditional alloys that minor additions lead to enhanced radiation resistance, it remains unclear in CSAs how atomic-level heterogeneity affects defect formation, damage accumulation, and microstructural 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 concentrations, to study how compositional complexity influences defect dynamics, and to bridge the knowledge gaps through understanding intricate electronic- and atomic-level interactions, mass and energy transfer processes, and radiation resistance performance. As a result, recent advances in defect dynamics and irradiation performance of CSAs are reviewed, intrinsic chemical effects on radiation performance are discussed, and direction for future studies is suggested.},
doi = {10.1016/j.cossms.2017.02.002},
journal = {Current Opinion in Solid State and Materials Science},
number = 5,
volume = 21,
place = {United States},
year = {Sat Mar 18 00:00:00 EDT 2017},
month = {Sat Mar 18 00:00:00 EDT 2017}
}

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