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

[Display omitted] 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 10nm after mechanical alloying to about 20nm. Vickers hardness reaches values of more than 10GPa. Differential...

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Bibliographic Details
Published in:Acta materialia 2015-09, Vol.97, p.207-215
Main Authors: Borchers, Christine, Garve, Clemens, Tiegel, Marie, Deutges, Martin, Herz, Andreas, Edalati, Kaveh, Pippan, Reinhard, Horita, Zenji, Kirchheim, Reiner
Format: Article
Language:English
Subjects:
Compacting
Differential scanning calorimetry
Ferrous alloys
Grain size
Graphite
High-pressure torsion
Localized shear band
Mechanical alloying
Nanocrystalline alloys
Steels
Torsion
Transmission electron microscopy
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Summary:[Display omitted] 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 10nm after mechanical alloying to about 20nm. Vickers hardness reaches values of more than 10GPa. 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.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2015.06.049