Development of a semi-empirical potential for simulation of Ni solute segregation into grain boundaries in Ag
Abstract
An Ag–Ni semi-empirical potential was developed to simulate the segregation of Ni solutes at Ag grain boundaries (GBs). The potential combines a new Ag potential fitted to correctly reproduce the stable and unstable stacking fault energies in this metal and the existing Ni potential from Mendelev et al (2012 Phil. Mag. 92 4454–69). The Ag–Ni cross potential functions were fitted to ab initio data on the liquid structure of the Ag80Ni20 alloy to properly incorporate the Ag–Ni interaction at small atomic separations, and to the Ni segregation energies at different sites within a high-energy Σ9 (221) symmetric tilt GB. By deploying this potential with hybrid Monte Carlo/ molecular dynamics simulations, it was found that heterogeneous segregation and clustering of Ni atoms at GBs and twin boundary defects occur at low Ni concentrations, 1 and 2 at%. This behavior is profoundly different from the homogeneous interfacial dispersion generally observed for the Cu segregation in Ag. A GB transformation to amorphous intergranular films was found to prevail at higher Ni concentrations (10 at%). The developed potential opens new opportunities for studying the selective segregation behavior of Ni solutes in interface-hardened Ag metals and its effect on plasticity.
- Authors:
-
- The Univ. of Vermont, Burlington, VT (United States)
- Ames Lab., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States); Univ. of Vermont, Burlington, VT (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1477199
- Alternate Identifier(s):
- OSTI ID: 1601108
- Report Number(s):
- IS-J-9767
Journal ID: ISSN 0965-0393
- Grant/Contract Number:
- AC02-05CH11231; AC02-07CH11358; SC0016270
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Modelling and Simulation in Materials Science and Engineering
- Additional Journal Information:
- Journal Volume: 26; Journal Issue: 7; Journal ID: ISSN 0965-0393
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; semi-empirical interatomic potential; stacking fault energy; grain boundary segregation; Ag–Ni alloy
Citation Formats
Pan, Zhiliang, Borovikov, Valery, Mendelev, Mikhail I., and Sansoz, Frederic. Development of a semi-empirical potential for simulation of Ni solute segregation into grain boundaries in Ag. United States: N. p., 2018.
Web. doi:10.1088/1361-651x/aadea3.
Pan, Zhiliang, Borovikov, Valery, Mendelev, Mikhail I., & Sansoz, Frederic. Development of a semi-empirical potential for simulation of Ni solute segregation into grain boundaries in Ag. United States. https://doi.org/10.1088/1361-651x/aadea3
Pan, Zhiliang, Borovikov, Valery, Mendelev, Mikhail I., and Sansoz, Frederic. Tue .
"Development of a semi-empirical potential for simulation of Ni solute segregation into grain boundaries in Ag". United States. https://doi.org/10.1088/1361-651x/aadea3. https://www.osti.gov/servlets/purl/1477199.
@article{osti_1477199,
title = {Development of a semi-empirical potential for simulation of Ni solute segregation into grain boundaries in Ag},
author = {Pan, Zhiliang and Borovikov, Valery and Mendelev, Mikhail I. and Sansoz, Frederic},
abstractNote = {An Ag–Ni semi-empirical potential was developed to simulate the segregation of Ni solutes at Ag grain boundaries (GBs). The potential combines a new Ag potential fitted to correctly reproduce the stable and unstable stacking fault energies in this metal and the existing Ni potential from Mendelev et al (2012 Phil. Mag. 92 4454–69). The Ag–Ni cross potential functions were fitted to ab initio data on the liquid structure of the Ag80Ni20 alloy to properly incorporate the Ag–Ni interaction at small atomic separations, and to the Ni segregation energies at different sites within a high-energy Σ9 (221) symmetric tilt GB. By deploying this potential with hybrid Monte Carlo/ molecular dynamics simulations, it was found that heterogeneous segregation and clustering of Ni atoms at GBs and twin boundary defects occur at low Ni concentrations, 1 and 2 at%. This behavior is profoundly different from the homogeneous interfacial dispersion generally observed for the Cu segregation in Ag. A GB transformation to amorphous intergranular films was found to prevail at higher Ni concentrations (10 at%). The developed potential opens new opportunities for studying the selective segregation behavior of Ni solutes in interface-hardened Ag metals and its effect on plasticity.},
doi = {10.1088/1361-651x/aadea3},
journal = {Modelling and Simulation in Materials Science and Engineering},
number = 7,
volume = 26,
place = {United States},
year = {2018},
month = {9}
}
Web of Science
Figures / Tables:

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Works referencing / citing this record:
Surface, Interface, and Temperature Effects on the Phase Separation and Nanoparticle Self Assembly of Bi-Metallic Ni0.5Ag0.5: A Molecular Dynamics Study
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Figures / Tables found in this record: