Shear-induced α → γ transformation in nanoscale Fe-C composite

Ivanisenko, Y., MacLaren, I., Sauvage, X., Valiev, R.Z. and Fecht, H.-J. (2006) Shear-induced α → γ transformation in nanoscale Fe-C composite. Acta Materialia, 54(6), pp. 1659-1669. (doi:10.1016/j.actamat.2005.11.034)

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High-resolution transmission electron microscopy and three-dimensional atom probe observations show clearly that a reverse transformation of body-centred cubic ferrite to face-centred cubic austenite occurs during severe plastic deformation of a pearlitic steel resulting in a nanocrystalline structure, something that never occurs in conventional deformation of coarse-grained iron and steels. The driving force and the mechanisms of this reverse transformation are discussed. It is shown that nanostructure and shear stresses are essential for this process, and the results confirm molecular dynamics predictions of such transformations in nanocrystalline iron.

Item Type:Articles
Keywords:High-pressure torsion, high-resolution electron microscopy (HREM), Iron and steels, nanocrystalline microstructure, martensitic phase transformation.
Glasgow Author(s) Enlighten ID:MacLaren, Dr Ian
Authors: Ivanisenko, Y., MacLaren, I., Sauvage, X., Valiev, R.Z., and Fecht, H.-J.
Subjects:Q Science > QC Physics
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Acta Materialia
First Published:First published in Acta Materialia 54(6):1659-1669
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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