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Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

Published online by Cambridge University Press:  14 November 2007

Keith E. Knipling ,
David C. Dunand  and
David N. Seidman
Keith E. Knipling
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5320, USA Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208-3108, USA
David C. Dunand
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208-3108, USA
David N. Seidman
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208-3108, USA Northwestern University Center for Atom-Probe Tomography (NUCAPT), Northwestern University, Evanston, IL 60208-3108, USA
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Abstract

Atom probe tomography was utilized to measure directly the chemical compositions of Al3(Zr1−xTix) precipitates with a metastable L12 structure formed in Al-0.1Zr-0.1Ti (at.%) alloys upon aging at 375°C or 425°C. The alloys exhibit an inhomogeneous distribution of Al3(Zr1−xTix) precipitates, as a result of a nonuniform dendritic distribution of solute atoms after casting. At these aging temperatures, the Zr:Ti atomic ratio in the precipitates is about 10 and 5, respectively, indicating that Ti remains mainly in solid solution rather than partitioning to the Al3(Zr1−xTix) precipitates. This is interpreted as being due to the very small diffusivity of Ti in α-Al, consistent with prior studies on Al-Sc-Ti and Al-Sc-Zr alloys, where the slower diffusing Zr and Ti atoms make up a small fraction of the Al3(Sc1−xTix/Zrx) precipitates. Unlike those alloys, however, the present Al-Zr-Ti alloys exhibit no interfacial segregation of Ti at the matrix/precipitate heterophase interface, a result that may be affected by a significant disparity in the evaporation fields of the α-Al matrix and Al3(Zr1−xTix) precipitates and/or a lack of local thermodynamic equilibrium at the interface.

Keywords

atom probe tomographyAl3Zr precipitateslocal magnificationAl-Zr-Ti
Type
Research Article
Information
Microscopy and Microanalysis , Volume 13 , Issue 6: Special Issue: Atom Probe Tomography , December 2007 , pp. 503 - 516
Copyright
© 2007 Microscopy Society of America

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Figure 3. 5 nm slice moving through a reconstruction of an A13(Zr,Ti) precipitate. Further it illustrates the discussed local magnification effect.

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