Vacancy and self-interstitial atomic diffusion coefficients in concentrated solid solution alloys can have a non-monotonic concentration dependence. Here, the kinetics of monovacancies and ⟨100⟩ dumbbell interstitials in Ni–Fe alloys are assessed using lattice kinetic Monte Carlo (kMC). The non-monotonicity is associated with superbasins, which impels using accelerated kMC methods. Detailed implementation prescriptions for first passage time analysis kMC (FPTA-kMC), mean rate method kMC (MRM-kMC), and accelerated superbasin kMC (AS-kMC) are given. The accelerated methods are benchmarked in the context of diffusion coefficient calculations. The benchmarks indicate that MRM-kMC underestimates diffusion coefficients, while AS-kMC overestimates them. In this application, MRM-kMC and AS-kMC are computationally more efficient than the more accurate FPTA-kMC. Our calculations indicate that composition dependence of migration energies is at the origin of the vacancy’s non-monotonic behavior. In contrast, the difference between formation energies of Ni–Ni, Ni–Fe, and Fe–Fe dumbbell interstitials is at the origin of their non-monotonic diffusion behavior. Additionally, the migration barrier crossover composition—based on the situation where Ni or Fe atom jumps have lower energy barrier than the other one—is introduced. KMC simulations indicate that the interplay between composition dependent crossover of migration energy and geometrical site percolation explains the non-monotonic concentration-dependence of atomic diffusion coefficients.
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21 August 2020
Research Article|
August 20 2020
Accelerated kinetic Monte Carlo: A case study; vacancy and dumbbell interstitial diffusion traps in concentrated solid solution alloys Available to Purchase
Keyvan Ferasat
;
Keyvan Ferasat
1
Department of Mechanical and Materials Engineering, Queen’s University
, Kingston, Ontario K7L 3N6, Canada
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Yuri N. Osetsky
;
Yuri N. Osetsky
2
Materials Science and Technology Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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Alexander V. Barashev;
Alexander V. Barashev
3
University of Michigan
, Ann Harbor, Michigan 48109, USA
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Yanwen Zhang
;
Yanwen Zhang
2
Materials Science and Technology Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
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Zhongwen Yao
;
Zhongwen Yao
1
Department of Mechanical and Materials Engineering, Queen’s University
, Kingston, Ontario K7L 3N6, Canada
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Laurent Karim Béland
Laurent Karim Béland
a)
1
Department of Mechanical and Materials Engineering, Queen’s University
, Kingston, Ontario K7L 3N6, Canada
a)Author to whom correspondence should be addressed: [email protected]
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Keyvan Ferasat
1
Yuri N. Osetsky
2
Alexander V. Barashev
3
Yanwen Zhang
2
Zhongwen Yao
1
Laurent Karim Béland
1,a)
1
Department of Mechanical and Materials Engineering, Queen’s University
, Kingston, Ontario K7L 3N6, Canada
2
Materials Science and Technology Division, Oak Ridge National Laboratory
, Oak Ridge, Tennessee 37831, USA
3
University of Michigan
, Ann Harbor, Michigan 48109, USA
a)Author to whom correspondence should be addressed: [email protected]
J. Chem. Phys. 153, 074109 (2020)
Article history
Received:
May 23 2020
Accepted:
July 31 2020
Citation
Keyvan Ferasat, Yuri N. Osetsky, Alexander V. Barashev, Yanwen Zhang, Zhongwen Yao, Laurent Karim Béland; Accelerated kinetic Monte Carlo: A case study; vacancy and dumbbell interstitial diffusion traps in concentrated solid solution alloys. J. Chem. Phys. 21 August 2020; 153 (7): 074109. https://doi.org/10.1063/5.0015039
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