Title: Helium irradiated cavity formation and defect energetics in Ni-based binary single-phase concentrated solid solution alloys

Abstract

In this study, binary single-phase concentrated solid solution alloys (SPCSAs), including Ni₈₀Co₂₀, Ni₈₀Fe₂₀, Ni₈₀Cr₂₀, Ni₈₀Pd₂₀, and Ni₈₀Mn₂₀ (in atomic percentage), were irradiated with 200 keV He⁺ ions at 500 °C. He cavity size and density distribution were systematically investigated using transmission electron microscope. Here we show that alloying elements have a clear impact on He cavity formation. Cavity size is the smallest in Ni₈₀Mn₂₀ but the largest in Ni₈₀Co₂₀. Alloying elements could also substantially affect cavity density profile. In-depth examination of cavities at peak damage region (~500 nm) and at low damage region (~300 nm) demonstrates that cavity size is depth (damage) dependent. Competition between consumption and production of vacancies and He atoms could lead to varied cavity size. Density functional theory (DFT) calculations were performed to obtain the formation and migration energies of interstitials and vacancies. Combined experimental and simulation results show that smaller energy gap between interstitial and vacancy migration energies may lead to smaller cavity size and narrower size distribution observed in Ni₈₀Mn₂₀, comparing with Ni₈₀Co₂₀. Finally, the results of this study call attention to alloying effects of specific element on cavity formation and defect energetics in SPCSAs, and could provide fundamental understanding to predict radiation effectsmore » in more complexed SPCSAs, such as high entropy alloys.« less

Authors:

Fan, Zhe ^[1]; Zhao, Shijun  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-0870-8153"

Jin, Ke  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-7697-0466"

Chen, Di ^[2]; Osetskiy, Yury N.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-8109-0030"

Wang, Yongqiang  ^[2];

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• Search DOE PAGES for ORCID "0000-0002-2938-5640"

Bei, Hongbin  ^[1];

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• Search DOE PAGES for ORCID "0000-0003-0283-7990"

More, Karren Leslie  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-5223-9097"

Zhang, Yanwen  ^[3]

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• Search DOE PAGES for ORCID "0000-0003-1833-3885"

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+ Show Author Affiliations

1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)

Publication Date:

Tue Oct 23 00:00:00 EDT 2018

Research Org.:

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

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC). Basic Energy Sciences (BES)

OSTI Identifier:

1494901

Alternate Identifier(s):

OSTI ID: 1755447; OSTI ID: 1995141

Report Number(s):

LA-UR-19-30364
Journal ID: ISSN 1359-6454

Grant/Contract Number:  

AC05-00OR22725; 89233218CNA000001

Resource Type:

Accepted Manuscript

Journal Name:

Acta Materialia

Additional Journal Information:

Journal Volume: 164; Journal Issue: C; Journal ID: ISSN 1359-6454

Publisher:

Elsevier

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE; He implantation; Cavity characteristic; Alloying effect; Defect energetics; Single-phase concentrated solid solution alloys; Material Science