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Title: Effect of d electrons on defect properties in equiatomic NiCoCr and NiCoFeCr concentrated solid solution alloys

Journal Article · · Physical Review Materials
ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering and Shull Wollan Center-Joint Inst. for Neutron Sciences and Dept. of Physics and Astronomy
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

Here, the role of d electrons in determining distributions of formation and migration energies for point defects in equiatomic NiCoCr and NiCoFeCr concentrated solid solution alloys (CSAs) are studied regarding electron density deformation flexibility based on first-principles calculations. The disordered state is taken into account by constructing special quasirandom structures. The migration barriers are determined by directly optimizing the saddle point. It is found that the formation energies of interstitials in CSAs are lower than those in pure Ni, whereas the formation energies of vacancies are higher. In both NiCoCr and NiCoFeCr, Co-related dumbbell interstitials exhibit lower formation energies. Notably, the distributions of migration energies for Cr interstitials and vacancies exhibit a remarkable overlap region. A detailed analysis of electronic properties reveals that the electronic charge deformation flexibility regarding eg to t2g transition has a dominant effect on defect energetics for different elements in CSAs. Thus the electron deformation ability is suggested as a key factor in understanding the peculiar defect behavior in CSAs.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1427635
Alternate ID(s):
OSTI ID: 1416068
Journal Information:
Physical Review Materials, Vol. 2, Issue 1; ISSN 2475-9953
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 83 works
Citation information provided by
Web of Science

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Local-environment dependence of stacking fault energies in concentrated solid-solution alloys journal February 2019
First-principles study of diffusion and interactions of hydrogen with silicon, phosphorus, and sulfur impurities in nickel journal March 2019
Influence of compositional complexity on interdiffusion in Ni-containing concentrated solid-solution alloys journal March 2018
First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy journal February 2019
Atomistic simulation of defect-dislocation interactions in concentrated solid-solution alloys journal October 2019
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 [Supplemental Data] dataset March 2018
First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy text January 2019
First-principles study of He behavior in a NiCoFeCr concentrated solid–solution alloy text January 2019

Figures / Tables (11)