Preferential diffusion in concentrated solid solution alloys: NiFe, NiCo and NiCoCr
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology
- 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
Web of Science
Similar Records
A comparative characterization of defect structure in NiCo and NiFe equimolar solid solution alloys under in situ electron irradiation
Local-environment dependence of stacking fault energies in concentrated solid-solution alloys