Elsevier

Scripta Materialia

Volume 58, Issue 7, April 2008, Pages 529-532
Scripta Materialia

Monodisperse Al3(LiScZr) core/shell precipitates in Al alloys

https://doi.org/10.1016/j.scriptamat.2007.11.012Get rights and content

We demonstrate a way of producing monodisperse Al3(LiScZr) core/shell inclusions using solid-state reactions. A uniform distribution of particles with a Li- and Sc-rich core surrounded by Li-rich shell a few nanometers thick with Zr segregating at the core/shell interface can be made reproducibly by exploiting kinetic and thermodynamic parameters. This approach to generating precipitate distributions can be applied to a range of alloys and could lead to new types of dispersion-strengthened materials.

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  • A comparative study on precipitation behavior of a sand-cast Al-Li-Cu alloy with the different quenching rates

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    According to reference [34,35] and STEM map-scanning images, the precipitation sequence is Sc-rich clusters → Al3Sc phase → layer rich in Zr → layer rich in Ti → Al3(Sc, Zr, Ti) phase. In Al–Li alloy containing Sc, Zr and Ti, some spherical particles Al3M are prone to form and those particles are enveloped by δˊ to form core–shell dispersoids [30,36]. Combined with the result of HADDF-STEM, the core–shell composite structure still exists in alloys with different quenching rates.

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