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Structure Determination Of The Al2cumg Intermetallic Phase

Published online by Cambridge University Press:  02 July 2020

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

The mechanical properties of Al-Cu-Mg alloys depend on a dispersion of Al2CuMg phase precipitates which form as laths along <100>A1, with {012}A1 as the habit plane. Despite extensive study, the crystal structure, morphology and interface structure between the Al2CuMg intermetallic phase and the Al matrix are still not well understood. Since the mechanical behavior of Al alloys strengthened by the S-phase cannot be controlled without a clear understanding of its crystallography and interface structure, the goal of this investigation was to characterize the crystal structure, evolution and interface structure of the S-phase using quantitative electron beam characterization techniques. Several models have been proposed for the crystal structure of Al2CuMg. A widely accepted model of the S-phase was given by Perlitz and Westgren (PW) [1], shown in Fig. 1. The unit cell of the PW model 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.

Type
High Resolution Electron Microscopy
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 180 - 181
Copyright
Copyright © Microscopy Society of America

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References

1.Perlitz, H. and Westgren, A., Arkivfor kemi, mineralogi och geologi, 16 B, 1 (1943).Google Scholar
2.Hovmoller, S., Ultramicroscopy, 41, 121 (1992).CrossRefGoogle Scholar
3.Radmilovic, V.. Kilaas., R. and Dahmen, U.. to be submitted in Ultramicroscopy (1999).Google Scholar
4.Radmilovic, V.. Kilaas, R.. Dahmen, U. and Shiflet, G.. submitted for publication in Acta Materialia (1998).Google Scholar
5.This work was supported by the Director. Office of Basic Energy Sciences. Materials Science Division. US Department of Energy, under contract DE-AC3-76SF00098.Google Scholar