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In-Beam Small-Angle Scattering Studies of Phase Separation in Ni-Ti Single Crystals

Published online by Cambridge University Press:  21 February 2011

Alberto Cerri ,
Bernd Schoenfeld ,
Gernot Kostorz  and
Albert F. Wright
Alberto Cerri
Affiliation:
Angewandte Physik, ETH Zürich, CH-8093 Zürich, Switzerland now at Festkörperphysik, University of Vienna, A-1090 Wien, Austria
Bernd Schoenfeld
Affiliation:
Angewandte Physik, ETH Zürich, CH-8093 Zürich, Switzerland
Gernot Kostorz
Affiliation:
Angewandte Physik, ETH Zürich, CH-8093 Zürich, Switzerland
Albert F. Wright
Affiliation:
Institut Laue-Langevin, BP 156X, F-38042 Grenoble-Cedex, France
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Abstract

Phase separation of quenched supersaturated Ni-(9.5-12.0)at.% Ti single crystals was followed by small-angle neutron scattering during in-beam aging at 773, 813 and 853 K. With the incident beam along <110>, scattering maxima in <100> directions were observed from the earliest stages of decomposition. While the results obtained at 773 K may be compatible with the general features of spinodal decomposition, a two-phase model with homogeneous precipitation in a depleted matrix is more appropriate at 813 and 853 K. Though scaling may be shown to hold, the aging kinetics is considerably slower than expected, which is related to a stabilizing effect of elastic coherency stresses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 166: Symposium J – Neutron Scattering for Materials Science , 1989 , 267
Copyright
Copyright © Materials Research Society 1990

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References

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