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Self-Blowing Process of Al Foam Assisted by Exothermic Reaction
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In-Situ SEM Observations of Moving Interfaces during Recrystallisation
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Use of Small-Angle X-Ray Scattering for the Characterisation of Precipitates in Aluminium Alloys
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Early Stage Hardening in AlCuMg Alloy Studied by 63Cu Nuclear Magnetic Resonance and Positron Annihilation
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Observation of Precipitates in Aluminium Alloys by Sub-Micrometer Resolution Tomography Using Fresnel Zone Plate
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Non Destructive Three Dimensional Imaging of Aluminium Alloys
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Use of Small-Angle X-Ray Scattering for the Characterisation of Precipitates in Aluminium Alloys

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Abstract:

This paper presents two studies illustrating the possibilities of Small-Angle X-ray Scattering for characterising quantitatively the state of precipitation in aluminium alloys. In the first example, maps are presented, of precipitate size and volume fraction in the cross-section of friction stir welds of AA7449 alloy. It is shown that the influence of welding speed on the distribution of mechanical properties can be understood using this microstructural data. In the second example, the precipitation kinetics in an Al-Zr-Sc alloy is evaluated by in-situ small angle X-ray scattering. Evidence is given for the heterogeneous chemical structure of the Al3(Zr,Sc) precipitates, consisting of a Zr-rich shell surrounding a Sc-rich core. It is shown that this particular distribution results in a very good resistance to coarsening of the precipitate microstructure.

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

1349-1354

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.1349

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Online since:

July 2006

Authors:

Alexis Deschamps, Myriam Dumont, Ludovic Lae, Françoise Bley

Keywords:

AA7449, Precipitation, Sc, Small Angle X-Ray Scattering, Zirconium

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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