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Effects of Deformation on Surface Modification by Nitrogen Ion-Implantation

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Abstract:

Ion-implantation on high purity iron substrates with nitrogen ions were carried out by using a Cockcroft Walton type accelerator under an accelerating voltage of 150 kV. Hardness measurements on the implanted surfaces showed that hardness effectively increased in the cold rolled specimens by ion-implantation in comparison with in an annealed specimen. Iron nitride, Fe16N2, was formed in the ion-implanted specimens. In the annealed specimen, relatively large particles of Fe16N2 were formed with low number density, while in the deformed specimens, dislocation substructures due to cold rolling were disappeared by ion-implantation and fine particles were densely formed. Strain field around dislocations induced by deformation provides nucleation sites for Fe16N2 particles.

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Periodical:

Materials Science Forum (Volumes 449-452)

Pages:

341-344

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.449-452.341

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Online since:

March 2004

Authors:

Atsushi Yamamoto, Harushige Tsubakino, Masami Ando, Lie Liu, Mititaka Terasawa, Tohru Mitamura

Keywords:

Fe16N2, Hardness, Ion Implantation, Iron Nitride, Nitrogen Ion, Pure Iron, TEM

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© 2004 Trans Tech Publications Ltd. All Rights Reserved

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