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Clustering and Segregation of Ag and Mg Atoms in the Nucleation and Growth Stage of Ω And T1 Precipitates In Al-Cu(-Li) Alloys

Published online by Cambridge University Press:  02 July 2020

M. Murayama ,
L. Reich  and
K. Hono
M. Murayama
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, 305, Japan
L. Reich
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, 305, Japan
K. Hono
Affiliation:
National Research Institute for Metals, 1-2-1 Sengen, Tsukuba, 305, Japan
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Extract

Trace additions of Ag and Mg in Al-Cu and Al-Li-Cu alloys change the precipitation processes drastically. In Al-Cu-Mg-Ag alloy, plate-like Ω phase precipitates on the {111} matrix planes. Similarly, additions of Ag and Mg to Al-Li-Cu alloy cause uniform dispersion of the T1 precipitate on the {111} matrix planes. Ω and T1 phases are structurally and morphologically similar, and a similar mechanism is expected to work in both alloy systems to enhance uniform dispersion of the plate-like precipitates on the {111} planes. A previous atom probe work [1] reported that Ag and Mg are segregated at the αΩ. interfaces in an Al-Cu-Mg-Ag alloy. In an Al-Li-Cu-Mg-Ag alloy, Ag and Mg atoms were found to be incorporated with the T, phase [2]; however, because of the thinness of the T1, plate, the exact location of these atoms with respect to the T1, phase could not be determined sucessfully by a conventional atom probe.

Type
Imaging and Analysis at the Atomic Level: 30 Years of Atom Probe Field Ion Microscopy
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 116 - 117
Copyright
Copyright © Microscopy Society of America

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References

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