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Citation: S.M. Eich, D. Beinke, and G. Schmitz (2015), "Embedded-atom potential for an accurate thermodynamic description of the iron-chromium system", Computational Materials Science, 104, 185-192. DOI: 10.1016/j.commatsci.2015.03.047.
Abstract: A new potential for the iron–chromium (Fe–Cr) alloy system was optimized for the embedded-atom method (EAM) within the two-band model (TBM) extension. In contrast to previous works, free model parameters are predominantly adapted to available experimental high-temperature data of the mixing enthalpy. As a major improvement, the metastable α/α' miscibility gap is accurately described in agreement with experimental data and a recent CALPHAD parametrization. The potential was also fitted to obtain an enriched solubility for chromium atoms in an iron matrix at 0 K, as it is predicted by several ab initio calculations. Furthermore, it was benchmarked against phonon excess entropies at 300 K and 1600 K demonstrating good agreement with respective results of inelastic neutron scattering.

EAM tabulated functions
Notes: These files were sent by S.M. Eich (University of Stuttgart) on 20 Aug. 2015 and posted with his permission. Dr. Eich noted, "That the provided tables are directly obtained by the fitting process for the Fe-Cr interaction without subsequent transformation into the effective pair format. This was done in the publication for comparison, but the additional rescaling of the electron density for pure components wouldn't describe the energetics of alloys correctly unless the rescaling has been performed before starting the fitting routine (which then would affect the fitting process)." Dr. Eich noted that the distance units are Angstroms and the energy units are eV.
File(s):
Citation: G. Bonny, R.C. Pasianot, D. Terentyev, and L. Malerba (2011), "Iron chromium potential to model high-chromium ferritic alloys", Philosophical Magazine, 91(12), 1724-1746. DOI: 10.1080/14786435.2010.545780.
Abstract: We present an Fe–Cr interatomic potential to model high-Cr ferritic alloys. The potential is fitted to thermodynamic and point-defect properties obtained from density functional theory (DFT) calculations and experiments. The developed potential is also benchmarked against other potentials available in literature. It shows particularly good agreement with the DFT obtained mixing enthalpy of the random alloy, the formation energy of intermetallics and experimental excess vibrational entropy and phase diagram. In addition, DFT calculated point-defect properties, both interstitial and substitutional, are well reproduced, as is the screw dislocation core structure. As a first validation of the potential, we study the precipitation hardening of Fe–Cr alloys via static simulations of the interaction between Cr precipitates and screw dislocations. It is concluded that the description of the dislocation core modification near a precipitate might have a significant influence on the interaction mechanisms observed in dynamic simulations.

EAM tabulated functions
Notes: These files were sent by Dr. Giovanni Bonny (Nuclear Materials Science Institute of SCK-CEN, Belgium) on 2 November 2017 and posted with his permission.
File(s):
LAMMPS pair_style hybrid/overlay eam/alloy eam/fs (2011--Bonny-G--Fe-Cr--LAMMPS--ipr1)
Notes: These files were sent by Dr. Giovanni Bonny (Nuclear Materials Science Institute of SCK-CEN, Belgium) on 2 November 2017 and posted with his permission. Giovanni Bonny also included Caution.pdf file, which explains why a large number of grid points for the s-embedding function are necessary. Giovanni Bonny noted that this warning is in fact valid for all known two-band model (2BM) potentials. Giovanni Bonny thanks Junlei Zhao (Department of Physics, University of Helsinki, Finland) for help in preparation of the LAMMPS files.
File(s):
Date Created: October 5, 2010 | Last updated: October 02, 2018