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arxiv: 2605.24887 · v1 · pith:QSA2PALOnew · submitted 2026-05-24 · ❄️ cond-mat.mtrl-sci

Edge Dislocation Mediated Anomalous Charge Transfer in Face Centered Cubic High Entropy Alloys

Gautam Anand , Swarnava Ghosh , Suman Chabri , Markus Eisenbach This is my paper

Pith reviewed 2026-06-30 00:04 UTC · model grok-4.3

classification ❄️ cond-mat.mtrl-sci
keywords high-entropy alloysedge dislocationscharge transferab initio calculationselectronegativity equalisationmagneto-volume fluctuationssolid solution strengthening
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The pith

Edge dislocations in high-entropy alloys induce anomalous charge redistribution through collective electronegativity equalisation

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

This paper uses large-scale ab initio calculations to examine charge transfer near edge dislocations in CoNi, CoCrNi, and CoCrFeMnNi alloys. The calculations show anomalous redistribution near the cores that deviates from the conventional electronegativity trend based on atom pairs. The deviation is traced to collective equalisation effects among many atoms rather than simple pairwise interactions. Asymmetric volume changes in the compressive and tensile regions around the dislocation are linked to magneto-volume fluctuations. The work establishes a direct coupling between the electronic redistribution and local volumetric response, opening routes to defect-aware models of strengthening in chemically complex alloys.

Core claim

Large-scale ab initio calculations reveal an anomalous charge redistribution near edge dislocation cores, including deviation from the conventional electronegativity trend. The observed behavior originates from collective electronegativity equalisation effects rather than simple pairwise atomic interactions. The asymmetric atomic volume response within the compressive and tensile regions of the dislocation field is rationalised in terms of anomalous magneto-volume fluctuations. These results establish a direct coupling between dislocation-induced electronic redistribution and local volumetric response in chemically complex alloys.

What carries the argument

collective electronegativity equalisation effects at edge dislocation cores

If this is right

  • Electronically informed solid-solution strengthening models become feasible for high-entropy alloys
  • Local electronic redistribution near dislocation cores governs deformation behavior and defect energetics
  • Defect-aware alloy design strategies can incorporate charge-transfer coupling to volumetric response
  • The demonstrated link supplies a pathway to predict how chemical complexity modulates dislocation effects

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • Comparable collective equalisation may operate at other defects such as vacancies or grain boundaries in the same alloys
  • Tuning local magnetism could provide an indirect handle on dislocation-mediated volume and charge behavior
  • The coupling suggests testable predictions for how alloy composition alters the strength contribution of individual dislocations

Load-bearing premise

The large-scale ab initio calculations accurately capture the local electronic structure, charge transfer, and magneto-volume effects near dislocation cores without significant artifacts from the exchange-correlation functional, supercell size, boundary conditions, or other computational parameters.

What would settle it

Experimental charge-density maps or independent calculations near edge dislocation cores that show strict adherence to conventional electronegativity trends with no collective deviation or magneto-volume asymmetry.

Figures

Figures reproduced from arXiv: 2605.24887 by Gautam Anand, Markus Eisenbach, Suman Chabri, Swarnava Ghosh.

Figure 1
Figure 1. Figure 1: Schematic representation of the method for studying the influence of the edge dislocation on charge [PITH_FULL_IMAGE:figures/full_fig_p004_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: Top panel shows the electronegativity values of the individual atomic species. Bottom panel shows [PITH_FULL_IMAGE:figures/full_fig_p007_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: Charge disproportion versus pressure for alloys. The top, middle and bottom panel shows the charge [PITH_FULL_IMAGE:figures/full_fig_p008_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: The variation of charge disproportion on elements in CoCrFeMnNi, CoCrNi and CoNi. The top [PITH_FULL_IMAGE:figures/full_fig_p009_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: A schematic representation of the variation in the expected atomic-volume with charge gain as well as [PITH_FULL_IMAGE:figures/full_fig_p011_5.png] view at source ↗
read the original abstract

Charge transfer in concentrated alloys governs their structural stability and functional response, and can be strongly perturbed by lattice defects. In high-entropy alloys, the interaction between edge dislocations and volume misfit plays a central role in solid-solution strengthening models; however, the influence of dislocations on the local charge transfer has not been explicitly investigated. In this work, large-scale ab initio calculations are employed to examine the dislocation-mediated charge transfer in CoNi, CoCrNi and CoCrFeMnNi alloys. The calculations reveal an anomalous charge redistribution near edge dislocation cores, including deviation from the conventional electronegativity trend. The observed behavior is shown to originate from collective electronegativity equalisation effects rather than simple pairwise atomic interactions. Furthermore, the asymmetric atomic volume response within the compressive and tensile regions of the dislocation field is rationalised in terms of anomalous magneto-volume fluctuations. These results establish a direct coupling between dislocation-induced electronic redistribution and local volumetric response in chemically complex alloys. The demonstrated coupling between dislocation-mediated charge transfer and atomic volume fluctuations provides a pathway toward electronically informed solid-solutions strengthening models and defect-aware alloy design strategy for chemically complex alloys. These findings further suggest that local electronic redistribution near dislocation-cores can play a critical role in governing the deformation behavior and defect-enbergetics in high-entropy alloys.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

2 major / 2 minor

Summary. The manuscript employs large-scale ab initio calculations to study edge dislocation-mediated charge transfer in FCC alloys CoNi, CoCrNi, and CoCrFeMnNi. It reports anomalous charge redistribution near dislocation cores that deviates from conventional electronegativity trends, attributes this to collective electronegativity equalization rather than pairwise interactions, and rationalizes asymmetric compressive/tensile atomic volume responses via anomalous magneto-volume fluctuations. The work claims a direct coupling between dislocation-induced electronic redistribution and local volumetric response, with implications for electronically informed solid-solution strengthening models in high-entropy alloys.

Significance. If the computational results are robust, the paper identifies a previously unexamined electronic mechanism linking dislocations to local charge and volume fluctuations in chemically complex alloys. This could inform defect-aware design strategies and extend solid-solution strengthening models beyond volume-misfit considerations. The ab initio treatment of collective effects and magneto-volume coupling in multi-principal-element systems represents a potentially valuable contribution if supported by adequate validation.

major comments (2)
  1. [Computational Methods] Computational Methods (assumed §2 or equivalent): No convergence data, error bars, or sensitivity tests are reported for supercell size, periodic boundary conditions, exchange-correlation functional (critical for local magnetic moments in CoCrFeMnNi-type systems), or charge partitioning scheme. These parameters directly control whether the reported deviations from electronegativity trends and the magneto-volume asymmetry are physical or artifacts, making this a load-bearing gap for the central claims.
  2. [Results] Results on charge redistribution (assumed §3 or §4): The claim that the behavior originates from collective equalization rather than pairwise interactions requires explicit comparison or decomposition (e.g., via controlled binary vs. multi-component calculations or charge-density difference maps). Without such evidence or quantitative metrics, the distinction remains interpretive and does not yet support the stated origin.
minor comments (2)
  1. [Abstract] Abstract: Typo 'defect-enbergetics' should be 'defect-energetics'.
  2. [Abstract] Abstract and text: The term 'anomalous magneto-volume fluctuations' is introduced without a clear definition or reference to prior magneto-volume literature in the alloys studied; a brief clarification would improve readability.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for the constructive and detailed report. The comments highlight important aspects of validation and clarity that we address below. We provide point-by-point responses to the major comments.

read point-by-point responses

  1. Referee: [Computational Methods] Computational Methods (assumed §2 or equivalent): No convergence data, error bars, or sensitivity tests are reported for supercell size, periodic boundary conditions, exchange-correlation functional (critical for local magnetic moments in CoCrFeMnNi-type systems), or charge partitioning scheme. These parameters directly control whether the reported deviations from electronegativity trends and the magneto-volume asymmetry are physical or artifacts, making this a load-bearing gap for the central claims.

    Authors: We agree that explicit convergence and sensitivity information is necessary to confirm the robustness of the reported charge redistribution and magneto-volume effects. In the revised manuscript we will add a dedicated subsection in the Methods section reporting supercell-size convergence tests, k-point sampling checks, comparisons of exchange-correlation functionals (including effects on local moments in the quinary alloy), and cross-validation of the charge partitioning scheme. Quantitative error estimates derived from these tests will be included for the key quantities. revision: yes

  2. Referee: [Results] Results on charge redistribution (assumed §3 or §4): The claim that the behavior originates from collective equalization rather than pairwise interactions requires explicit comparison or decomposition (e.g., via controlled binary vs. multi-component calculations or charge-density difference maps). Without such evidence or quantitative metrics, the distinction remains interpretive and does not yet support the stated origin.

    Authors: The calculations already span binary (CoNi), ternary (CoCrNi) and quinary (CoCrFeMnNi) compositions, with the magnitude of deviation from electronegativity trends increasing systematically with the number of principal elements; this progression is difficult to reconcile with purely pairwise interactions. To make the collective character more explicit we will add charge-density difference maps across the three alloys and a quantitative metric (e.g., integrated deviation from expected pairwise charge transfer) in the revised Results section. revision: partial

Circularity Check

0 steps flagged

No circularity; results are direct ab initio outputs

full rationale

The paper reports outcomes from large-scale DFT calculations on edge dislocations in CoNi, CoCrNi, and CoCrFeMnNi alloys. Claims of anomalous charge redistribution, deviation from electronegativity trends, collective equalisation effects, and magneto-volume fluctuations are presented as direct computational observations and interpretations thereof, with no parameter fitting, self-referential definitions, or load-bearing self-citations that reduce the results to inputs by construction. The derivation chain consists of simulation setup followed by analysis of computed quantities, which is self-contained against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 1 axioms · 0 invented entities

Abstract-only review; no free parameters, new entities, or ad-hoc axioms are introduced or quantified. Relies on standard density functional theory assumptions for metallic systems.

axioms (1)
  • domain assumption Density functional theory accurately describes electronic structure and charge transfer in these metallic high-entropy alloys
    Implicit basis for the large-scale ab initio calculations described in the abstract.

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