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Point defect evolution in Ni, NiFe and NiCr alloys from atomistic simulations and irradiation experiments

Journal Article · · Acta Materialia
 [1];  [2];  [1];  [1];  [1];  [2];  [3]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials and Technology Div.
  2. Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Nuclear Engineering and Radiological Sciences
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials and Technology Div.; Univ. of Tennessee, Knoxville, TN (United States). Materials Science and Engineering

Using molecular dynamics simulations, we elucidate irradiation-induced point defect evolution in fcc pure Ni, Ni0.5Fe0.5, and Ni0.8Cr0.2 solid solution alloys. We find that irradiation-induced interstitials form dislocation loops that are of 1/3 <111>{111}-type, consistent with our experimental results. While the loops are formed in all the three materials, the kinetics of formation is considerably slower in NiFe and NiCr than in pure Ni, indicating that defect migration barriers and extended defect formation energies could be higher in the alloys than pure Ni. As a result, while larger size clusters are formed in pure Ni, smaller and more clusters are observed in the alloys. The vacancy diffusion occurs at relatively higher temperatures than interstitials, and their clustering leads to formation of stacking fault tetrahedra, also consistent with our experiments. The results also show that the surviving Frenkel pairs are composition-dependent and are largely Ni dominated.

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)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1209216
Alternate ID(s):
OSTI ID: 22453125
OSTI ID: 1251431
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Vol. 99; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Origin of radiation resistance in multi-principal element alloys journal October 2018
Precipitation behavior of AlxCoCrFeNi high entropy alloys under ion irradiation journal August 2016
Shape Stability of Metallic Nanoplates: A Molecular Dynamics Study journal November 2019
Unique Challenges for Modeling Defect Dynamics in Concentrated Solid-Solution Alloys journal July 2017
Effects of Al and Ti Additions on Irradiation Behavior of FeMnNiCr Multi-Principal-Element Alloy journal October 2019
Enhancing radiation tolerance by controlling defect mobility and migration pathways in multicomponent single-phase alloys journal December 2016
Direct Observation of Defect Range and Evolution in Ion-Irradiated Single Crystalline Ni and Ni Binary Alloys journal February 2016
Defect energetics of concentrated solid-solution alloys from ab initio calculations: Ni 0.5 Co 0.5 , Ni 0.5 Fe 0.5 , Ni 0.8 Fe 0.2 and Ni 0.8 Cr 0.2 journal January 2016
Effect of atomic order/disorder on Cr segregation in Ni-Fe alloys journal September 2018
Classical interatomic potential for quaternary Ni–Fe–Cr–Pd solid solution alloys journal August 2018
A new approach for electronic heat conduction in molecular dynamics simulations journal August 2019
Atomic-scale modeling of the thermodynamic and kinetic properties of dilute alloys driven by forced atomic relocations journal December 2019
Simulation of Rutherford backscattering spectrometry from arbitrary atom structures journal October 2016
Irradiation responses and defect behavior of single-phase concentrated solid solution alloys journal September 2018
Atomic scale modeling of the thermodynamic and kinetic properties of dilute alloys driven by forced atomic relocations text January 2019

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