Journal
ACTA MATERIALIA
Volume 57, Issue 11, Pages 3277-3286Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.03.034
Keywords
Mechanical milling; Spark plasma sintering; Iron; Nanocrystalline materials; Atom probe
Funding
- Center for Nanostructured Materials Technology (CNMT)
- Korea Institute of Science and Technology (KIST)
- Giant Straining Process for Advanced Materials Containing Ultra-High Density Lattice Defects
- World Premier International (WPI) Research Center Initiative on Materials Nanoarchitectonics, MEXT, Japan
- CREST, JST
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Nanocrystalline iron containing it certain fraction of coarse grains with nanosized oxide dispersoids has been processed by mechanically milling Fe powder and subsequent spark plasma sintering. Sintered samples exhibited a high tensile strength of 2100 Wit with 5% ductility; by optimizing the sintering conditions, it was possible to tune the strength-ductility balance. The optimally sintered material showed a tensile strength of 1500 MPa and 15% elongation. The microstructure consists of nanograined (<100 mm) its well as coarse-grained regions (>1 mu m) with uniform dispersion of nanosized chromium oxide particles (similar to 10 nm). The strength and elongation show strong dependence oil the volume fraction or the coarse grains, and the high strength can be attributed to the ultrafine grain size of the nanograined regions and precipitation hardening by the oxide dispersoids. The ductility is considered to be due to file presence of coarse grains. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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