{
  "abstract": "Most ceramics suffer from brittle surface damage and cracking when small particles slide across the surface under low load. Microscratching tests are a useful technique to mimic this loading scenario while retaining the material's deformation history; however, the impact of pre-seeded dislocations, which can significantly facilitate plastic deformation, has not been explored in ceramics. Here, the influence of mechanically seeded dislocations on the microscratching response of oxides is investigated using a model perovskite, SrTiO3. First, various dislocation densities over four orders of magnitude are introduced via room-temperature cyclic Brinell indenter scratching. Subsequently, load-ramped microscratching tests are performed within the pristine and dislocation-seeded regions using a nominally 30 μm spherical diamond tip. On the reference pristine surface, we observe a clear transition from elastic to elasto-plastic deformation, followed by median/radial cracking at higher loads. In contrast, pre-seeded dislocations, accompanied by residual compressive stresses, suppress elastic deformation and lead to median/radial crack shortening and subsequent transition to a partial cone crack. The subsurface cracks are characterized by 3D Nano-CT. The changes in crack geometry, with and without dislocations, were described using the Lawn-Evans-Marshall and Lawn-Wiederhorn-Roberts models. These findings provide direct evidence of dislocation-regulated near-surface damage tolerance, with general applicability to other plastically deformable oxides.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.05056",
  "author_total": 9,
  "authors": [
    {
      "name": "Chukwudalu Okafor"
    },
    {
      "name": "Oliver Preuß"
    },
    {
      "name": "Thomas Chudoba"
    },
    {
      "name": "Ujjval Bansal"
    },
    {
      "name": "Daniela Exner"
    },
    {
      "name": "Konrad Priszokovich"
    },
    {
      "name": "Yanfei Gao"
    },
    {
      "name": "Christoph Kirchlechner"
    },
    {
      "name": "Xufei Fang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/0qm95sbqshjz4.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.05056",
  "fulltext_url": null,
  "id": "0qm95sbqshjz4",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.05056",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "cond-mat.mtrl-sci"
    ],
    [
      "openalex",
      "2211|Metal and Thin Film Mechanics"
    ]
  ],
  "openalex": "W7211874463",
  "pdf_url": "https://arxiv.org/pdf/2609.05056",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-04",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/0qm95sbqshjz4.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:19:14Z",
      "native_id": "2609.05056",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.05056"
    }
  ],
  "subjects": [
    {
      "field": "physics",
      "origin": "arxiv:cond-mat.mtrl-sci",
      "subfield": "condensed-matter"
    }
  ],
  "title": "Influence of dislocation density on the tribological response in oxides: case study on SrTiO3",
  "title_text": "Influence of dislocation density on the tribological response in oxides: case study on SrTiO3",
  "type": "preprint",
  "updated_at": "2026-10-30T12:19:14Z",
  "url": "https://research.draconitic.com/paper/0qm95sbqshjz4",
  "venue": "arXiv",
  "versions": []
}