Nanocrystalline steel obtained by mechanical alloying of iron and graphite subsequently compacted by high-pressure torsion

Christine Borchers, Clemens Garve, Marie Tiegel, Martin Deutges, Andreas Herz, Kaveh Edalati, Reinhard Pippan, Zenji Horita, Reiner Kirchheim

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Abstract

Steel powders obtained by mechanical alloying of iron and graphite were compacted by high-pressure torsion. During high-pressure torsion, mean grain sizes rise from about 10 nm after mechanical alloying to about 20 nm. Vickers hardness reaches values of more than 10 GPa. Differential scanning calorimetry revealed superabundant vacancies present in concentrations up to 10-3. The results are discussed in terms of strain, strain rate, energy input and deformation mechanisms.

Original languageEnglish
Article number12234
Pages (from-to)207-215
Number of pages9
JournalActa Materialia
Volume97
DOIs
Publication statusPublished - Jul 15 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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    Borchers, C., Garve, C., Tiegel, M., Deutges, M., Herz, A., Edalati, K., Pippan, R., Horita, Z., & Kirchheim, R. (2015). Nanocrystalline steel obtained by mechanical alloying of iron and graphite subsequently compacted by high-pressure torsion. Acta Materialia, 97, 207-215. [12234]. https://doi.org/10.1016/j.actamat.2015.06.049