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Evolution of Nanostructure of FeNi(Ti/Cr)N Alloys During Phase Cycling

Published online by Cambridge University Press:  21 March 2011

N. G. Chechenin ,
P. M. Bronsveld ,
A. R. Chezan ,
C. B. Craus ,
D. O. Boerma ,
J. Th.M. de Hosson  and
L. Niesen
N. G. Chechenin
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
P. M. Bronsveld
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
A. R. Chezan
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
C. B. Craus
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
D. O. Boerma
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
J. Th.M. de Hosson
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
L. Niesen
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, NL 9747 AG Groningen, The Netherlands
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Abstract

A possibility to manipulate the microstructure of cold rolled (down to less than 1% of the initial thickness) Fe94Ni4Ti2 and Fe93Ni4 Cr3 foils via inter-phase cycling by nitriding and de-nitriding is investigated. The grains in the as-rolled material had a dominating (001)[110] texture and contained a complicated internal nanostructure due to a dislocation network. The interphase cycling α↔γ'-Fe4N and α↔ε-FexN (x∼3) was investigated as a tool to change or destroy the texture. We observed that the α↔γ'-Fe4N phase transformations weaken but do not erase the texture. A stronger reduction of the texture was obtained in the α↔ε-cycling, where grains with a new orientation appear in XRD scans. During the α↔γ' phase transformation a lamella structure is formed which is coarsening with the number of cycles. It was found that the rates of the α↔γ' and α↔ε interphase transitions were slowing down with the number of cycles. The observation is explained by an increase of kinetic barriers while removing/transforming the rolling-induced defects during the cycling.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y8.1
Copyright
Copyright © Materials Research Society 2001

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References

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