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TEM Microstuctural Characterization of a 2091 (Al-Li-Mg-Zr) Alloy Subjected to Welding Operations

Published online by Cambridge University Press:  02 July 2020

M.C.S de Macedo  and
I.G Solórzano
M.C.S de Macedo
Affiliation:
Department of Materials Science and Metallurgy PUC-Rio, Rio de Janeiro, Brasil
I.G Solórzano
Affiliation:
Department of Materials Science and Metallurgy PUC-Rio, Rio de Janeiro, Brasil
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Extract

For over two decades considerable effort has been directed towards the development of Al-Li base alloys with the objective of replacing conventional high aluminum alloys, due to the fact that lithium additions cause substantial reduction in density accompanied by significant increase in the elastic modulus, implying, therefore, in appreciable improvement in the specific properties of the resulting alloys. These properties depend on the miscrostucture evolution during heat treatment or welding cycle. The microstructure of the commercial Al-Li systems is complex due to the addition of alloying elements, which increases the number of the allowed stable and metastable phases. During the thermo-mechanical processing of the 2091 alloy, the probable metastable are δ’, GPB zones and S’, the stable phases are S, T2 and the high temperature R (1-3). Further, the Zr precipitates the Al3Zr. The present study deals with the microstructure evolution of welded joints of the 2091 alloy studied by transmission electron microscopy, TEM.

Type
Metals and Alloys
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. 872 - 873
Copyright
Copyright © Microscopy Society of America

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References

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4. This work was sponsored by Pechiney Recherche (France). The authors also acknowledge the support of CNPq (Brazil).