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A Small Angle Neutron Scattering Investigation of the Kinetics of Phase Separation in an Fe-27.5 AT.% Cr-5.6 AT.% Ni Alloy

Published online by Cambridge University Press:  26 February 2011

J. E. Epperson ,
V. S. Rainey ,
C. G. Windsor ,
K. A. Hawick  and
Haydn Chen
J. E. Epperson
Affiliation:
Materials Science Division, Argonne National Laboratory, Argonne, IL, USA
V. S. Rainey
Affiliation:
Materials Physics and Metallurgy Division, AERE Harwell, Oxfordshire, U.K
C. G. Windsor
Affiliation:
Materials Physics and Metallurgy Division, AERE Harwell, Oxfordshire, U.K
K. A. Hawick
Affiliation:
Physics Department, Edinburgh University, Edinburgh, Scotland, U.K
Haydn Chen
Affiliation:
Department of Materials Science and Engineering, University of Illinois, Urbana, IL, USA
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Abstract

The small angle neutron scattering has been investigated in situ at 450° and 500°C for a polycrystalline, duplex Fe-27.5 at.% Cr - 5.6 at.% Ni steel. A broad diffuse maximum in the scattering function is the signature of the α' phase formation, and this maximum is superimposed on a strong, temperature-dependent component due mainly to critical magnetic scattering. The time dependence of the shift in the peak intensity position to lower scattering vectors and the increase in peak intensity obey power law scaling behavior. Furthermore, the structure function exhibits dynamical scaling, after about three hours annealing. It is suggested that this behavior could be utilized to predict the microstructure, and hence some of the properties, after significantly longer annealing times.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 205: Symposium F – Kinetics of Phase Transformations , 1990 , 113
Copyright
Copyright © Materials Research Society 1992

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