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Title: Irradiation-induced damage evolution in concentrated Ni-based alloys

Understanding the effects of chemical complexity from the number, type and concentration of alloying elements in single-phase concentred solid-solution alloys (SP-CSAs) on defect dynamics and microstructure evolution is pivotal for developing next-generation radiation-tolerant structural alloys. A specially chosen set of SP-CSAs with different chemical complexity (Ni 80Fe 20, Ni 80Cr 20 and Ni 40Fe 40Cr 20) are investigated using 1.5 MeV Mn ions over a wide fluence range, from 2 × 10 13 to 1 × 10 16 ions cm –2 at room temperature. Based on an integrated study of Rutherford backscattering spectroscopy in channeling geometry and molecular dynamics simulations, the results demonstrate that Ni 40Fe 40Cr 20 is more radiation tolerant than Ni 80Fe 20, Ni 80Cr 20 and elemental Ni in the low fluence regime. While chemical complexity of this set of SP-CSAs is clearly demonstrated to affect defect evolution through suppressed defect production and enhanced recombination at early stages, the effect of the mixed ferro- and anti-ferromagnetic interactions is not the only controlling factor responsible for the improved radiation performance. As a result, the observed strong alloying effect on defect evolution is attributed to the altered defect migration mobilities of defect clusters in these alloys, an intrinsicmore » characteristic of the complex energy landscapes in CSAs.« less
Authors:
 [1] ;  [1] ;  [2] ;  [1] ;  [2] ;  [1] ;  [3] ;  [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Univ. of Tennessee, Knoxville, TN (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725
Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 135; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
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 Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; concentrated solid-solution alloys; ferro/antiferromagnetic coupling; ion irradiation; damage evolution; molecular dynamics simulations
OSTI Identifier:
1366404

Velisa, Gihan, Ullah, Mohammad Wali, Xue, Haizhou, Jin, Ke, Crespillo, Miguel L., Bei, Hongbin, Weber, William J., and Zhang, Yanwen. Irradiation-induced damage evolution in concentrated Ni-based alloys. United States: N. p., Web. doi:10.1016/j.actamat.2017.06.002.
Velisa, Gihan, Ullah, Mohammad Wali, Xue, Haizhou, Jin, Ke, Crespillo, Miguel L., Bei, Hongbin, Weber, William J., & Zhang, Yanwen. Irradiation-induced damage evolution in concentrated Ni-based alloys. United States. doi:10.1016/j.actamat.2017.06.002.
Velisa, Gihan, Ullah, Mohammad Wali, Xue, Haizhou, Jin, Ke, Crespillo, Miguel L., Bei, Hongbin, Weber, William J., and Zhang, Yanwen. 2017. "Irradiation-induced damage evolution in concentrated Ni-based alloys". United States. doi:10.1016/j.actamat.2017.06.002. https://www.osti.gov/servlets/purl/1366404.
@article{osti_1366404,
title = {Irradiation-induced damage evolution in concentrated Ni-based alloys},
author = {Velisa, Gihan and Ullah, Mohammad Wali and Xue, Haizhou and Jin, Ke and Crespillo, Miguel L. and Bei, Hongbin and Weber, William J. and Zhang, Yanwen},
abstractNote = {Understanding the effects of chemical complexity from the number, type and concentration of alloying elements in single-phase concentred solid-solution alloys (SP-CSAs) on defect dynamics and microstructure evolution is pivotal for developing next-generation radiation-tolerant structural alloys. A specially chosen set of SP-CSAs with different chemical complexity (Ni80Fe20, Ni80Cr20 and Ni40Fe40Cr20) are investigated using 1.5 MeV Mn ions over a wide fluence range, from 2 × 1013 to 1 × 1016 ions cm–2 at room temperature. Based on an integrated study of Rutherford backscattering spectroscopy in channeling geometry and molecular dynamics simulations, the results demonstrate that Ni40Fe40Cr20 is more radiation tolerant than Ni80Fe20, Ni80Cr20 and elemental Ni in the low fluence regime. While chemical complexity of this set of SP-CSAs is clearly demonstrated to affect defect evolution through suppressed defect production and enhanced recombination at early stages, the effect of the mixed ferro- and anti-ferromagnetic interactions is not the only controlling factor responsible for the improved radiation performance. As a result, the observed strong alloying effect on defect evolution is attributed to the altered defect migration mobilities of defect clusters in these alloys, an intrinsic characteristic of the complex energy landscapes in CSAs.},
doi = {10.1016/j.actamat.2017.06.002},
journal = {Acta Materialia},
number = C,
volume = 135,
place = {United States},
year = {2017},
month = {6}
}