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Crystallographic structure of S′ precipitates in Al–Li–Cu–Mg alloys

Published online by Cambridge University Press:  31 January 2011

J. I. Pérez-Landazábal ,
M. L. Nó ,
G. Madariaga  and
J. San Juan
J. I. Pérez-Landazábal
Affiliation:
Dpto. Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain
M. L. Nó
Affiliation:
Dpto. Física Aplicada II, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain
G. Madariaga
Affiliation:
Dpto. Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain
J. San Juan
Affiliation:
Dpto. Física de la Materia Condensada, Facultad de Ciencias, Universidad del País Vasco, Apdo. 644, 48080 Bilbao, Spain
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Abstract

The crystallographic structures of some phases present as precipitates in Al–Li–Cu–Mg alloys are not perfectly resolved. In particular, several structural models have been proposed for the S′ phase, and this controversy is not yet resolved. New x-ray powder diffraction measurements have been performed to compare the theoretical powder diffraction patterns associated with each proposed model with the measured spectra obtained from two different kinds of alloys. The structural model of the S′ phase described by Mondolfo [L. F. Mondolfo, Aluminum Alloys Structure and Properties (Butterworths, London, 1976)] agrees with the experimental results and allows us to reject the two other proposed crystallographic models.

Type
Articles
Information
Journal of Materials Research , Volume 12 , Issue 3 , March 1997 , pp. 577 - 580
Copyright
Copyright © Materials Research Society 1997

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