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Title: Preferential diffusion in concentrated solid solution alloys: NiFe, NiCo and NiCoCr

Journal Article · · Acta Materialia
 [1];  [1];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology; Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering

Single-phase concentrated solid solution alloys, including high entropy alloys, exhibit remarkable mechanical properties as well as extraordinary corrosion and radiation resistance compared to pure metals and dilute alloys. However, the mechanisms responsible for these properties are unknown in many cases. In this work, we employ ab initio molecular dynamics based on density functional theory to study the diffusion of interstitial atoms in Ni and Ni-based face-centered cubic concentrated alloys including NiFe, NiCo and NiCoCr. We model the defect trajectories over 100 ps and estimate the tracer diffusion coefficients, correlation factors and activation energies. We find that the diffusion mass transport in concentrated alloys is not only slower than that in pure components, i.e. sluggish diffusion, but also chemically non-homogeneous. The results obtained here can be used to understand and predict atomic segregation and phase separation in concentrated solid solution alloys under irradiation.

Research Organization:
Oak Ridge National Laboratory (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)
Grant/Contract Number:
AC05-00OR22725; AC02-05CH11231
OSTI ID:
1354655
Alternate ID(s):
OSTI ID: 1357977; OSTI ID: 1420024
Journal Information:
Acta Materialia, Vol. 128, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 94 works
Citation information provided by
Web of Science

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Cited By (9)

Unique Challenges for Modeling Defect Dynamics in Concentrated Solid-Solution Alloys journal July 2017
Structure and thermal expansion of coordination shells in solid and liquid Invar alloys by molecular dynamics study journal January 2020
Effect of d electrons on defect properties in equiatomic NiCoCr and NiCoFeCr concentrated solid solution alloys journal January 2018
Irradiation responses and defect behavior of single-phase concentrated solid solution alloys journal September 2018
Atomistic simulation of defect-dislocation interactions in concentrated solid-solution alloys journal October 2019
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys text January 2017
Shape Stability of Metallic Nanoplates: A Molecular Dynamics Study journal November 2019
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys [Supplementary Data] preprint December 2017
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys journal December 2017

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