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Measurement Of Interfacial Segregation In Aluminum-Magnesium Alloys Using A Feg-Tem And Eds

Published online by Cambridge University Press:  02 July 2020

J.S. Vetrano  and
C.H. Henager
J.S. Vetrano
Affiliation:
Pacific Northwest National Laboratory, Richland, WA99352
C.H. Henager
Affiliation:
Pacific Northwest National Laboratory, Richland, WA99352
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Extract

Aluminum-magnesium alloys are currently being utilized in lightweight automotive components and their good strength and weldability characteristics has made them candidates for increased use. The primary problem with using aluminum alloys for automotive applications is their relatively low formability. Superplastic forming (SPF) is a viable method for producing high elongations and is enabled in these alloys by the manipulation of intermetallic particles (e.g. Al3Sc) that restrict grain growth at the high homologous temperatures necessary for this technique [1]. SPF of Al-Mg-Mn-Sc alloy has yielded elongations of over 600% [2]. However, Al3Sc particles age rapidly at high temperatures which can reduce their strengthening characteristics following deformation. It has been experimentally observed that the addition of Zr to Al-Sc alloys retards the aging of the Al3Sc precipitates [3]. This is beneficial for high temperature conditions like superplastic forming and welding. In this study we examine the location of Zr in the strupturc and how it may be inhibiting particle aging.

Type
Atomic Structure And Microchemistry Of Interfaces
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. 160 - 161
Copyright
Copyright © Microscopy Society of America

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References

1.Shcrby, O.D. and Wadsworth, J., Progress in Materials Science, 33 (1989) p. 169.CrossRefGoogle Scholar
2.Vetrano, J.S., Henager, C.H. Jr., Smith, M.T.and Brucmmcr, S.M., “Hot Deformation of Aluminum Alloys, II”, cd. by Bielcr, T.R., Lalli, L.A. and MacEwcn, S.R. (TMS, Warrendale, PA, 1998) p. 407Google Scholar
3.Elagin, V.I., Zakharov, V.V. and Rostova, T.D., Metals Science and Heat Treatment, 34 (1992) p. 37.CrossRefGoogle Scholar
4.This work supported by the Materials Division, Office of Basic Energy Sciences, U.S. Department of Energy under Contract DE-AC06-76RLO 1830.Google Scholar