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Evolution and coarsening of Al2O3 dispersoids at 500 °C to 600 °C in a mechanically alloyed Al-Ti-O based material

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Abstract

The formation and coarsening of Al2O3 dispersoids have been investigated at 500 °C, 550 °C, and 600 °C in a mechanically alloyed (MA) extrusion of composition Al-0.35wt pct Li-1wt pct Mg-0.25wt pct C-10vol pct TiO2 for times up to 1500 hours. In the as-extruded condition, the dispersed phases included Al3Ti, Al4C3, MgO, cubic TiO (C-TiO), monoclinic TiO (M-TiO), TiO2, and a small amount of Al2O3. However, numerous Al2O3 dispersoids (various polymorphs: η, γ, α, and δ) with “block-shaped” morphology were formed after heat treatment due to reduction of C-TiO, M-TiO, and TiO2. Transmission electron microscopy (TEM) and X-ray diffraction (XRD) showed conclusively the transformation of these phases to additional Al2O3 and Al3Ti. High resolution TEM showed that the α-Al2O3 dispersoids exhibited some lattice matching with the α-Al matrix. Coalescence of the block-shaped Al2O3 dispersoids occurred after heat treatment, and Al4C3 also became attached to them. The length and width of the block-shaped Al2O3 dispersoids increased by a factor of ∼1.55 between 340 and 1500 hours at 600 °C.

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Authors and Affiliations

  1. Department of Engineering Materials, University of Sheffield, S1 3JD, Sheffield, United Kingdom

    I. C. Barlow (Postdoctoral Research Associate), H. Jones (Professor of Metallurgy and Materials) & W. M. Rainforth (Professor of Materials Science and Engineering)

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  1. I. C. Barlow
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  2. H. Jones
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  3. W. M. Rainforth
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Barlow, I.C., Jones, H. & Rainforth, W.M. Evolution and coarsening of Al2O3 dispersoids at 500 °C to 600 °C in a mechanically alloyed Al-Ti-O based material. Metall Mater Trans A 32, 2937–2945 (2001). https://doi.org/10.1007/s11661-001-0168-9

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  • DOI: https://doi.org/10.1007/s11661-001-0168-9

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