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Diffuse Neutron Scattering and Short-Range Order in Alloys – Contrast Variation and Contrast Enhancement by Isotopic Replacement

Published online by Cambridge University Press:  26 February 2011

P.P. Mueller ,
L. Reinhard ,
B. Schoenfeld ,
G. Kostorz ,
W. Buehrer  and
O. Schaerpf
P.P. Mueller
Affiliation:
Institut für Angewandte Physik, Eidgenossische Technische Hochschule, CH-8093 Zürich
L. Reinhard
Affiliation:
Institut für Angewandte Physik, Eidgenossische Technische Hochschule, CH-8093 Zürich
B. Schoenfeld
Affiliation:
Institut für Angewandte Physik, Eidgenossische Technische Hochschule, CH-8093 Zürich
G. Kostorz
Affiliation:
Institut für Angewandte Physik, Eidgenossische Technische Hochschule, CH-8093 Zürich
W. Buehrer
Affiliation:
Lab. für Neutronenstreuung der ETHZ, c/o EIR, CH-5303 Würenlingen
O. Schaerpf
Affiliation:
Institut Laue-Langevin, F-38042 Grenoble-Cedex
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Abstract

In Al-Cu alloys containing Guinier-Preston zones, the scattering contributions due to short-range order and atomic displacements vary differently when the scattering contrast between Al and Cu is changed. The diffuse neutron scattering of Al-Cu single crystals containing 63Cu or 65Cu is compared and evaluated to test the current methods of separating the two scattering contributions. - The nature of a sugggtted ordered state in α-brass is also studied by neutron scattering, using Cu to enhance the scattering contrast in a Cu-30 at.% Zn alloy. A broad diffuse peak is found in powdered, appropriately aged samples, confirming that the first Warren-Cowley short-range order parameter is negative.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 82: Symposium I – Characterization of Defects in Materials , 1986 , 85
Copyright
Copyright © Materials Research Society 1987

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References

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