Effect of Titanium Addition on Composite L12 Precipitates in Aluminum-Zirconium Alloy

Takashi Maeshima; Hideaki  Matsuoka

doi:10.4028/www.scientific.net/MSF.638-642.279

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HomeMaterials Science ForumMaterials Science Forum Vols. 638-642Effect of Titanium Addition on Composite L12...

Effect of Titanium Addition on Composite L1₂ Precipitates in Aluminum-Zirconium Alloy

Abstract:

The particle morphology and composition of nanometer-scale Al3(Zr1-xTix) precipitates formed after aging at 450 °C for 1 h in Al-0.3mol%Zr-0.5mol%Ti alloy were investigated using high resolution electron microscopy (HREM) and three dimensional atom probe tomography (3D-APT). The alloy exhibits an inhomogeneous distribution of solute atoms after casting. After aging, Al3(Zr1-xTix) precipitates with a metastable L12 structure formed within solute-enriched dendrites. The Al3(Zr1-xTix) precipitate particles were spherical with diameters between 3 and 5 nm. The Al3(Zr1-xTix) precipitates were found to be coherent with matrix using HREM. Interfacial segregation of Ti at the matrix/precipitates was also observed in the composite Al3(Zr1-xTix) precipitates. The Zr:Ti atomic ratio in the Al3(Zr1-xTix) precipitates measured by 3D-APT was approximately 7 (x=0.125).

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Materials Science Forum (Volumes 638-642)

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279-284

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https://doi.org/10.4028/www.scientific.net/MSF.638-642.279

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January 2010

Authors:

Takashi Maeshima, Hideaki Matsuoka

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Aluminum-Zirconium-Titanium, Composite Precipitates, L1₂ Structure

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