Role of electronic energy loss on defect production and interface stability: Comparison between ceramic materials and high-entropy alloys

Zhang, Yanwen; Silva, Chinthaka; Lach, Timothy G.; Tunes, Matheus Araujo; Zhou, Yufan; Nuckols, Lauren; Boldman, Walker L.; Rack, Philip D.; Donnelly, Stephen E.; Jiang, Li; Wang, Lumin; Weber, William J.

doi:10.1016/j.cossms.2022.101001

Role of electronic energy loss on defect production and interface stability: Comparison between ceramic materials and high-entropy alloys

Journal Article · Thu Apr 14 00:00:00 UTC 2022 · Current Opinion in Solid State and Materials Science

DOI:https://doi.org/10.1016/j.cossms.2022.101001· OSTI ID:1872838

^[1]; Silva, Chinthaka ^[2]; ^[3]; ^[4]; Zhou, Yufan ^[3]; Nuckols, Lauren ^[5]; Boldman, Walker L. ^[5]; ^[6]; Donnelly, Stephen E. ^[7]; Jiang, Li ^[8]; Wang, Lumin ^[8]; Weber, William J. ^[9]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Univ. of Huddersfield (United Kingdom); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Tennessee, Knoxville, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Univ. of Huddersfield (United Kingdom)
Univ. of Michigan, Ann Arbor, MI (United States)
Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

High-entropy alloys (HEAs) and some complex alloys exhibit desirable properties and significant structural stability in harsh environments, including possible applications in advanced reactors. Energetic ion irradiation is often used as a surrogate for neutron irradiation; however, the impact of ion electronic energy deposition and dissipation is often neglected. Moreover, differences in recoil energy spectrum and density of cascade events on damage evolution must also be considered. In many chemically complex alloys, the mean free path of electrons is reduced significantly, thus their decreased thermal conductivity and slow dissipation of localized radiation energy can have noticeable effects on displacement cascade evolution that is greatly different from metals with high thermal conductivity. In this work, nanocrystalline HEAs of Ni₂₀Fe₂₀Co₂₀Cr₂₀Cu₂₀ and nonequiatomic (NiFeCoCr)₉₇Cu₃, both having much lower room-temperature thermal conductivity than pure Ni or Fe, are chosen as model HEAs to reveal the role that electronic energy loss during ion irradiation has in complex alloys. The response of nanocrystalline HEAs is investigated under irradiation at room temperature using MeV Ni and Au ions that have different ratios of electronic energy to damage energy, which is the energy dissipated in displacing atoms. Different from previously reported amorphization of nanocrystalline SiC, experimental results on these HEAs show that, similar to the process in nanocrystalline oxide materials, both inelastic thermal spikes via electron–phonon coupling and elastic thermal spikes via collisions among atomic nuclei contribute to the overall grain growth. The growth follows a power law dependence with the total deposited ion energy, and the derived value of the power-exponent suggests that the irradiation-induced instability at and near grain boundaries leads to local rapid atomic rearrangements and consequently grain growth. The high power-exponent value can be attributed to the sluggish diffusion and delayed defect evolution arising from the chemical complexity intrinsic to HEAs. Here, this work calls attention to quantified fundamental understanding of radiation damage processes beyond that of simplified displacement events, especially in simulating neutron environments.

View Accepted Manuscript (DOE)

Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Engineering and Physical Sciences Research Council (EPSRC); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)

Grant/Contract Number:: 89233218CNA000001; AC05-00OR22725; AC52-07NA27344

OSTI ID:: 1872838

Alternate ID(s):: OSTI ID: 1886126
OSTI ID: 1994131

Report Number(s):: LA-UR-22-23704; LLNL-JRNL-814729

Journal Information:: Current Opinion in Solid State and Materials Science, Journal Name: Current Opinion in Solid State and Materials Science Journal Issue: 4 Vol. 26; ISSN 1359-0286

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Role of electronic energy loss on defect production and interface stability: Comparison between ceramic materials and high-entropy alloys

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