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Molecular dynamics simulations of surface oxidation and of surface slip irreversibility under fatigue in oxygen environment

Atomistic simulations probe O2 interactions with Ni and Cu surfaces and relate early oxidation to fatigue slip morphology, with a phenomenological model for slip irreversibility and discussion of environment-assisted surface relief.

Summary

ReaxFF-based MD (and related atomistic protocols in the paper) simulate early oxidation of Ni and Cu, reproducing oxygen superstructures and incipient NiO embryos. Ni vs Cu oxidation mechanisms differ. Thin surface oxide nano-layers are argued not to dominate PSB surface relief or micro-notch statistics compared to inert-environment slip—consistent with experiments finding similar persistent slip band morphology in air vs inert. A general relation for surface slip irreversibility is presented and environment-assisted fatigue models are discussed. The J. Mater. Res. framing connects atomistic oxide embryos to mesoscale arguments about fatigue surface evolution without overstating nano-oxide control of roughness.

Methods

A — Force-field training / fitting: ReaxFF parameter sets for Ni–O and Cu–O surface chemistry are used as published in the article (no new GA/CMA-ES-style reoptimization summarized on this page); lineage aligns with reactive metal–oxygen parametrizations in the ReaxFF literature.

B — Molecular dynamics / reactive sampling: Reactive MD (article specifies LAMMPS or equivalent workflow) probes O\(_2\) interaction with Ni and Cu surfaces—adsorption, dissociation, reconstruction, and incipient oxide embryos. Coupling to fatigue uses cyclic slip-related simulation or energy-based estimates of slip irreversibility as developed in the paper’s later sections. Cell sizes, O\(_2\) pressure or coverage protocol, ensemble, timestep, temperature, and duration must be taken from the peer-reviewed PDF (pdf_path); the local extract is short.

C — DFT / static QM: Not a primary simulation layer in the summarized atomistic oxidation work; any DFT references in the article serve comparison or interpretation—see full text.

D — Review / non-simulation framing: Primary research article in J. Mater. Res. linking atomistic oxidation to fatigue surface arguments; not a standalone review.

Engine: LAMMPS-style ReaxFF MD is the stated workflow in §B above; confirm inputs in the PDF. System size & composition: N/A — atom counts and slab stoichiometry are not in the short local extract. Boundaries / periodicity: N/A — PBC details not in the extract. Ensemble / thermostat / timestep / duration: N/A — NVE/NVT/NPT, thermostat, timestep (fs), and trajectory length are not in the indexed excerpt—read Methods in pdf_path. Barostat / stress: N/A — not stated for the oxidation cells. Temperature: literature discussion in the extract references room-temperature surface experiments; the authors’ MD thermostat setpoints must be taken from the article. Pressure / gas environment: introductory context cites O\(_2\) partial pressures in related Ag cyclic studies (saturation above ~0.13 Pa at 0.25 Hz in cited work); MD gas-cell pressures for Ni/Cu belong in the full text. Electric field: N/A — not used. Replica / enhanced sampling: N/A — not used.

Findings

Outcomes / mechanisms. Reactive MD reproduces oxygen superstructures and incipient NiO on Ni, contrasts Ni vs Cu oxidation pathways, and builds thin nano-oxide motifs at the surface.

Comparisons. Atomistic results are compared to surface-science expectations for oxides/superstructures and, for fatigue-relevant conclusions, to experiments reporting similar persistent slip band (PSB) surface relief in air vs inert environments.

Sensitivity / design levers. The introduction cites O\(_2\) partial-pressure saturation effects in related cyclic surface studies (literature context); quantitative p(O\(_2\)) sweeps for the authors’ own MD cells belong in the full article.

Limitations / outlook. The abstract stresses that superficial nano-oxides do not dominate PSB roughness or micro-notch statistics in the simulated picture, motivating revised environment-assisted arguments; quantitative slip irreversibility parameters require the Methods sections of the PDF.

Corpus / PDF honesty. Local normalized/extracts/2017fan-downloaded-f-s0884291417004009_p1-2.txt is short—protocol numerics are not duplicated here without the peer-reviewed text.

Limitations

Corpus extract is short; full MD parameters and quantitative p values require the complete JMR article. Cambridge Core download banner in metadata does not affect science but notes licensing for redistribution.

Wiki prose here is a navigation aid. Definitive numbers, protocol details, and figure-level claims should be taken from the peer-reviewed article at pdf_path (and any Supporting Information cited there), not from this page alone.

Relevance to group

van Duin co-authorship on metal oxidation + mechanics using ReaxFF, bridging tribology/fatigue and reactive MD.

Citations and evidence anchors