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Structure Determination of Al2CuMg Precipitates in Al-Cu-Mg Alloys by Structure Refinement and Quantitative Image Comparison

Published online by Cambridge University Press:  02 July 2020

R. Kilaas  and
V. Radmilovic
R. Kilaas
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley Laboratory, University of California, Berkeley, CA, USA
V. Radmilovic
Affiliation:
National Center for Electron Microscopy, Lawrence Berkeley Laboratory, University of California, Berkeley, CA, USA University of Belgrade, Faculty of Technology and Metallurgy, Dept. of Physical Metallurgy, Belgrade, Yugoslavia
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Extract

Al-Cu-Mg based alloys are of significant interest for aerospace and other applications, due to their low weight, mechanical strength and corrosion resistance. Their mechanical properties are based on a dispersion of S-phase precipitates, which have the composition Al2CuMg. The crystal structure of this inter-metallic phase has been studied using different diffraction techniques for more than five decades. While several models have been proposed for the structure of S-phase[l], only one of the previously proposed models were found to give a reasonable fit to our experimental data. This model, shown in Fig. 1 and given by Perlitz and Westgren (PW) [2] based on X-ray diffraction data, is orthorhombic with unit cell dimensions a = 0:4 nm, b = 0.923 nm, and c = 0.714 nm, space group Cmcm, containing 16 atoms in the ratio Al:Cu:Mg = 2:1:1.

Several HREM images of S-phase precipitates located near the edge of the foil, Fig. 2, recorded along the [100]s and [010]s directions, were digitized from film and used for analysis.

Type
Image Simulation and Image Processing Techniques
Information
Microscopy and Microanalysis , Volume 6 , Issue S2: Proceedings: Microscopy & Microanalysis 2000, Microscopy Society of America 58th Annual Meeting, Microbeam Analysis Society 34th Annual Meeting, Microscopical Society of Canada/Societe de Microscopie de Canada 27th Annual Meeting, Philadelphia, Pennsylvania August 13-17, 2000 , August 2000 , pp. 1030 - 1031
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Kilaas, R. and Radmilovic, V., Ultramicroscopy (submitted).Google Scholar
2.Perlitz, H. and Westgren, A., Arkivfor kemi, mineralogi och geologi 16B (1943) 1.Google Scholar
3.Kilaas, R., Journal of Microscopy 190 (1998) 45.CrossRefGoogle Scholar
4.Hovmoller, S., Ultramicroscopy, 41 (1992) 121.CrossRefGoogle Scholar
5. This work is supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the U.S.Department of Energy under Contract No. DE-AC03-76SF00098.Google Scholar