REVIEW 4 major objections 4 minor 1 cited by
A machine-learned interatomic potential brings DFT-level accuracy to two medium-entropy alloys, capturing chemical short-range order and stacking fault energies at a fraction of DFT's computational cost.
Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →
A Moment Tensor Potential trained on DFT data reproduces elastic trends, chemical short-range ordering, and stacking fault energies for CoCrNi and CoCrFeNi, with damped CSRO magnitudes and a partially circular CSRO validation.
T0 review reviewed 2026-08-04 challenge →
load-bearing objection Useful new MTP for CoCrFeNi/CoCrNi, but the CSRO validation is in-sample by the paper's own admission, and the abstract oversells the agreement. the 4 major comments →
Achieving DFT accuracy in short range ordering and stacking fault energy using moment tensor potential for CoCrFeNi and CoCrNi
The pith
A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.
The reading
Core claim
On its own terms, the paper demonstrates that a moment tensor potential fitted to spin-polarized DFT data—without explicit spin degrees of freedom—reproduces chemical-ordering preferences and stacking-fault energies in CoCrFeNi and CoCrNi. Force RMSEs are 0.153 eV/Å (CoCrNi) and 0.203 eV/Å (CoCrFeNi); elastic constants lie within a few percent of DFT; Warren–Cowley parameters have correct signs for every nearest-neighbor pair; ISF energies are 53.9 and 35.6 mJ/m². The potential extrapolates to non-equiatomic compositions, matching DFT's bulk and shear modulus rankings, and captures fault-plane chemistry. The claimed net result is a transferable model with DFT-level fidelity at molecular-dyna
What carries the argument
The central machinery is the moment tensor potential (MTP), a machine-learned interatomic potential that represents each atom's local environment by moment tensors—products of radial functions and tensor products of neighbor displacement vectors—up to a chosen expansion level (here level 22). The potential is trained on energies, forces, and stresses from spin-polarized DFT for unary, binary, ternary, and quaternary configurations. The load-bearing device is the implicit encoding of magnetic interactions: the MTP has no spin variables, yet the paper asserts that because it is fitted to spin-polarized DFT energies and forces, it inherits magnetic effects. This implicit encoding is what lets t
Load-bearing premise
The assumption that carries the argument is that spin-polarized DFT energies and forces encode magnetic interactions well enough that a potential without explicit spin variables can still reproduce the chemistry that magnetism drives; if that encoding fails for Cr-rich or manganese-containing local environments, the CSRO and stacking-fault predictions lose their physical base.
What would settle it
A decisive test would compute Warren–Cowley parameters for CoCrNi at 500 K from MTP-based lattice Monte Carlo using a supercell size and MC schedule identical to the DFT benchmark; if the MTP values remain damped when system sizes are matched, the missing explicit spin polarization—not sampling—causes the discrepancy.
If this is right
- If the MTP transfers as claimed, large-scale molecular dynamics of dislocation glide, twinning, and radiation damage in CoCrFeNi and CoCrNi can use near-DFT accuracy instead of empirical potentials that misrepresent CSRO.
- The potential can screen non-equiatomic alloy compositions for elastic properties cheaply, identifying promising Fe/Co/Ni/Cr ratios before experiment.
- Capturing chemistry-dependent stacking fault energies means the MTP can predict how local segregation changes deformation mechanisms such as twinning and phase transformation.
- The trained potential and training database are publicly available, so other groups can validate and extend the approach to related high-entropy alloys.
Where Pith is reading between the lines
- If the size/sampling explanation for the damped CSRO magnitudes is correct, re-running the MTP Monte Carlo with DFT-sized supercells and matching MC schedules should raise the Warren–Cowley magnitudes toward the DFT values; if they remain low, implicit spin encoding is the limiting factor.
- The same training recipe could be stress-tested on magnetically complex alloys containing manganese, such as CoCrFeMnNi, where local moments are stronger and explicit spin degrees of freedom may be harder to sidestep.
- The sign-structure accuracy suggests the MTP could be used to train coarser models—for example, effective pair interactions or cluster expansions—that explicitly encode CSRO tendencies at larger length scales.
Editorial analysis
A structured set of objections, weighed in public.
Referee Report
Summary. The manuscript develops Moment Tensor Potentials for the equiatomic medium-entropy alloys CoCrFeNi and CoCrNi, trained on a spin-polarized DFT database spanning unary, binary, ternary, and quaternary structures (Methods IV.A). The authors validate forces (II.A), elastic constants against DFT, EAM, MEAM, and experiments (II.B, Table I), compositional trends of bulk and shear moduli for non-equiatomic compositions (II.C), chemical short-range order via hybrid MC/MD Warren–Cowley parameters (II.D, Table IV), and stacking fault energies (II.E, Table V, Figs. 6–7). The paper claims near-DFT accuracy, reproduction of DFT-reported CSRO signs, and ISF energies consistent with DFT.
Significance. Machine-learned interatomic potentials that are accurate and efficient for CoCrFeNi and CoCrNi would be a useful community resource. The paper has several concrete strengths: the force validation is quantitatively strong (RMSE ~0.15–0.20 eV/Å, R²~0.996); the non-equiatomic composition trends in bulk and shear moduli are a non-trivial transferability test; the chemistry-resolved stacking-fault trends are physically informative; and the potential/training database is promised on a public GitLab page. If the CSRO comparison can be made out-of-sample and the accuracy claims are appropriately calibrated, the work would be a solid contribution. At present, however, the central CSRO claim is compromised by an apparent overlap between training and validation data, and several headline statements overstate the reported quantitative agreement.
major comments (4)
- [Section II.D, Table IV] The CSRO validation is potentially circular. The text states, "The MTP, trained on DFT–MC trajectories, again matches the DFT signs across all pairs," referring to the DFT-MC results of Tamm et al. [68]. If DFT-MC trajectories were included in the training database, then matching the signs of the same DFT-MC procedure is an in-sample result and does not establish transferability. Methods IV.A lists unary/binary/ternary/quaternary perturbed structures but does not mention MC trajectories, creating an internal contradiction. If the MC trajectories were not part of the training set, the sentence is inaccurate; if they were, the comparison is invalid for the stated purpose. Please clarify the exact composition of the training database and provide an out-of-sample test of CSRO, e.g., by validating against independently generated DFT-MC configurations not used in training.
- [Table I and Section II.B] The claim of "near-DFT accuracy" for elastic constants is not supported by the table. For CoCrFeNi, the MTP (SQS) values deviate from DFT by C11 −10.1%, C12 −14.8%, C44 −21.4%, and B −21.9%. For CoCrNi, MTP (SQS) gives C12 −18.1% and C44 −18.5%; even the MTP (SRO) values show C12 −20.3% and C44 −12.9% for CoCrNi. These are not <5% errors, and the EAM/MEAM values are sometimes closer to DFT (e.g., EAM C12 for CoCrFeNi is +2.5%). The abstract and conclusion state that the MTP "accurately predicts elastic properties" and "quantitatively reproduces the lattice constants and elastic constants... achieving near-DFT accuracy." This overstates the evidence. Please either report deviations explicitly as a limitation, distinguish SQS vs SRO as the relevant benchmark, or revise the wording.
- [Section II.E, Fig. 6, Table V] The title and abstract claim DFT accuracy for stacking fault energy, but the quantitative agreement is partial. For CoCrNi, MTP gives γ_ISF ≈ 53.88 ± 5 mJ/m², while the cited DFT value is ~80 mJ/m² [69], a ~33% underestimate; the MTP spread (roughly 40–65 mJ/m²) is also much narrower than the DFT-observed distribution. For CoCrFeNi, MTP gives 35.56 mJ/m² against a DFT range of 17–34 mJ/m², so it matches only the upper bound. The text acknowledges some of this, but the abstract's phrase "consistent with DFT predictions" and the title's "achieving DFT accuracy in ... stacking fault energy" are not supported. Please reframe these as qualitative/trend-level agreement or provide a more systematic benchmark.
- [Section II.D, Warren–Cowley parameter definition] The sign convention for the Warren–Cowley parameter is inconsistent with the physical interpretation. The paper defines α^n_ij = (p^n_ij − c_j)/(δ_ij − c_j). For like pairs (i=j), this gives a positive value when p_ii > c_i, i.e., an excess of like-atom neighbors, which is conventionally clustering/attraction between like species, not "repulsion." Yet the text repeatedly describes positive Cr–Cr and Fe–Fe values as "strong repulsion" (e.g., Table IV caption and Fig. 4 discussion). If the reference [68] used the alternative standard definition α_ij = 1 − p_ij/c_j, then positive same-species values would indicate repulsion, but the definitions would not be equivalent and the sign comparisons in Table IV would be invalid. Please state the convention used in both the MTP calculations and the reference data, and correct the terminology accordingly.
minor comments (4)
- [Abstract and Section II.A] The abstract and introduction claim that energies, forces, and stresses are all validated, but Section II.A reports force validation only. Please add energy/stress error metrics or correct the wording.
- [Section IV.B] The description "r_min was initially set to 2.0 Å and was adaptively updated during training" is too vague to be reproducible. Please define the update criterion and the range of r_min values used.
- [Tables II and III] In the top-three lists, the compositions and modulus values are helpful, but the tables would benefit from explicit column headers clarifying that compositions are in at.% and from a note on whether MTP and DFT used the same MC/MD relaxation protocol.
- [Data availability] The GitLab link is a positive step. Please add a versioned release or DOI and state explicitly whether the training database includes the DFT-MC trajectories mentioned in Section II.D, since this is critical for evaluating the CSRO validation.
Circularity Check
CSRO validation is in-sample: the MTP is stated to be trained on the DFT-MC trajectories whose CSRO signs it then reproduces; elastic, compositional, and stacking-fault claims remain largely independent.
specific steps
-
fitted input called prediction
[Section II.D (Short range ordering), paragraph following Table IV]
"The MTP, trained on DFT–MC trajectories, again matches the DFT signs across all pairs and follows the relative trends (e.g., positive clustering on Ni–Ni, Cr–Cr, Co–Co; ordering on Ni–Cr, Ni–Fe, Cr–Co, Cr–Fe, Co–Fe), even if the absolute magnitudes are systematically smaller."
This sentence states that the MTP's training data were the DFT-MC trajectories whose Warren-Cowley parameters (from Tamm et al. [68]) are used as the DFT reference. Fitting an MTP to the energies, forces, and stresses of those configurations encodes the same energetic preferences that drive CSRO in those configurations; running MC/MD with the fitted potential and recovering the same sign pattern is therefore an in-sample consistency check, not an independent prediction. The Methods section (IV.A) does not list MC trajectories in the database, so the overlap is not quantified, but the paper's own wording makes the training/validation overlap explicit. The acknowledged underestimation of CSRO magnitudes is a second-order issue and does not make the sign agreement an out-of-sample validation;
full rationale
The paper's central CSRO claim is compromised by the explicit statement that the MTP was trained on the same DFT-MC trajectories it is validated against. This is a partial circularity: the MTP is not directly fitted to Warren-Cowley parameters, so the sign agreement is not definitionally guaranteed, but it is also not an independent confirmation. The rest of the paper's validation chain is more solid. Elastic constants for the equiatomic alloys are not shown to be in-sample: the finite-distortion stress data described in Methods is in the elemental-constituent paragraph, and the alloy elastic constants are compared to literature DFT/experiment. The non-equiatomic bulk/shear-modulus trends are extrapolations from equiatomic training and are genuine predictions. Stacking fault energies are not training targets (the database is described as perturbed bulk/binary/ternary/quaternary structures, not faulted supercells), so the ISF values near 54 mJ/m2 (CoCrNi) and 35.6 mJ/m2 (CoCrFeNi) are independent outputs. The paper also honestly notes the magnitude shortfall in CSRO and calls for like-for-like comparisons, but that does not repair the in-sample sign validation. Overall score 6: one central 'prediction' reduces substantially to its training input, while the other headline results retain independent content.
Axiom & Free-Parameter Ledger
free parameters (5)
- MTP basis level (lev_max) =
22
- MTP maximum cutoff radius rmax =
5.0 to 6.0 Å, selected
- MTP minimal cutoff radius rmin =
2.0 Å, adaptively updated
- Training weights (we, wf, ws) =
1, 0.01, 0.001
- Model selection ensemble =
400 models (2 levels x 10 cutoffs x 20 seeds)
axioms (4)
- domain assumption PBE-GGA DFT with spin polarization provides accurate reference energies, forces, and stresses for Co-Cr-Fe-Ni alloys
- domain assumption MTP with level-22 descriptors can represent the relevant potential energy surface
- domain assumption Hybrid MC/MD at 500 K with 5,000,000 steps reaches equilibrated CSRO
- domain assumption Training on spin-polarized DFT energies implicitly encodes magnetic effects without explicit spin variables
Cite this review
Pith. "Pith review of Achieving DFT accuracy in short range ordering and stacking fault energy using moment tensor potential for CoCrFeNi and CoCrNi." pith.science (2026). https://pith.science/paper/DTIERERM
@misc{pith2026250911231,
author = {Pith},
title = {Pith review of: Achieving DFT accuracy in short range ordering and stacking fault energy using moment tensor potential for CoCrFeNi and CoCrNi},
year = {2026},
howpublished = {\url{https://pith.science/paper/DTIERERM}},
note = {Machine review of arXiv:2509.11231}
}
read the original abstract
Medium-entropy alloys (MEAs) such as CoCrFeNi and CoCrNi are promising structural materials owing to their outstanding mechanical and thermal properties, which arise from complex chemical disorder and atomic-scale interactions. Although density functional theory (DFT) has provided fundamental insights into these systems, its high computational cost limits exploration of large-scale phenomena. Classical interatomic potentials have been used to address this gap but often lack the fidelity needed to capture many-body interactions and chemical short-range ordering (CSRO) effects. In this work, we developed a machine-learned Moment Tensor Potential (MTP) to bridge accuracy and efficiency. The MTP was trained on a comprehensive DFT database spanning unary to quaternary configurations and reproduces energies, forces, and stresses with near-DFT accuracy across diverse structural and chemical environments. It accurately predicts elastic properties and recovers compositional trends in bulk and shear moduli in agreement with DFT. Hybrid Monte Carlo/molecular dynamics simulations capture CSRO, reproducing key DFT-reported features including Cr-Cr and Fe-Fe repulsion and Ni-Cr ordering. Stacking fault energetics were modeled, yielding ISF energies near 54 mJ/m2 for CoCrNi and 36 mJ/m2 for CoCrFeNi, consistent with DFT predictions. Local chemical environment effects on stacking faults were also resolved: Co-rich planes reduce, whereas Cr- or Fe-rich planes increase, the stacking fault energy. By enabling large-scale, high-fidelity simulations at a fraction of DFT's cost, the developed MTP provides a robust framework for predictive modeling of thermodynamic stability, defect behavior, and mechanical response of FCC MEAs.
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