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

ISSN
1873-2453
1359-6454
Date Issued
2015
Author(s)
Garve, Clemens
Tiegel, Marie C.
Deutges, Martin
Herz, Andreas
Edalati, Kaveh
Pippan, Reinhard
Horita, Zenji
DOI
10.1016/j.actamat.2015.06.049
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. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.