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Molecular dynamics study of melting, diffusion, and sintering of cementite chromia core-shell particles

This corpus slug registers a reduced-size PDF of the cementite–chromia ReaxFF additive-manufacturing study; the peer-reviewed science is the same as on 2021gao-computationa-molecular-dynamics.

Evidence and attribution

Authority of statements

Prose below summarizes the publication identified by doi and the primary article PDF on 2021gao-computationa-molecular-dynamics. This file may omit figures or layout present in the full PDF.

Summary

ReaxFF MD in LAMMPS models hydrated Fe\(_3\)C with a Cr\(_2\)O\(_3\) shell versus bare Fe\(_3\)C, following Section 2 of the article: validation of the existing Shin et al. C/H/O/Fe/Cr parameter set for Fe\(_3\)C (lattice, EOS, surfaces, moduli), then NVT production runs (0.25 fs, Berendsen thermostat with 100 fs damping) for melting (1000–2600 K, 200 ps per step), diffusion (900 K and 2000 K in 200 Å cells), and two-particle sintering (900 K and 2000 K, 0.5 ns) with QEq-style charge updates every step. Full tabulated protocols and figures: 2021gao-computationa-molecular-dynamics.

Methods

1 — MD application (atomistic dynamics)

Same as the version-of-record entry: LAMMPS + ReaxFF; NVT; 0.25 fs timestep; Berendsen thermostat (100 fs damping); 200 Å cubic cells for large-cell tasks; periodic boundary conditions on the cubic supercells; 900 K and 2000 K for solid/liquid comparisons; 1000–2600 K melting scan; 0.5 ns sintering segments; charges updated every step. Barostat / hydrostatic pressure control: N/A — no barostat; N/A — pressure not fixed (constant-volume NVT only). Electric field / enhanced sampling: N/A. Engine: LAMMPS. For atom counts, heating schedule, and restraint-based cohesive energy, use the primary PDF on 2021gao-computationa-molecular-dynamics—this reduced binary may clip pagination.

2 — Force-field training

N/A — no new ReaxFF fit in this work. The authors use the published C/H/O/Fe/Cr ReaxFF from Shin et al. and validate Fe\(_3\)C and related properties against DFT and experiment in Section 2.1 of the article (see primary page for itemization).

3 — Static QM / DFT (validation)

Auxiliary BAND/DFT and literature DFT comparisons in Section 2.1 to justify using the existing ReaxFF for Fe\(_3\)C; not a DFT production study. Details on 2021gao-computationa-molecular-dynamics.

4 — Review / non-simulation

N/A.

Findings

Outcomes: Shell does not change the reported melting point vs same-size bare Fe\(_3\)C; oxygen ingress; core-initiated vs surface-initiated melting; four-stage liquid sintering vs three stages in solid 900 K runs within the simulated time. Comparisons: core–shell vs pure particle; DFT/ experiment only in pre-MD validation. Sensitivity / levers: temperature (solid vs liquid, heating ramp). Corpus: numerical detail and figure alignment should be taken from papers/Gao_CompSciMat_2021_Cementite_Chromia.pdf; this page tracks the reduced PDF only.

Limitations

The reduced PDF may omit figures or pagination. Prefer the full VOR file when both exist. ReaxFF and finite system size caveats as on the primary article page.

Relevance to group

Adri C. T. van Duin is senior author; duplicate manifest row for the same group AM powder study.

Citations and evidence anchors

Reader notes (navigation)

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