In-situ TEM investigation of microstructural evolution in magnetron sputtered Al-Zr and Al-Zr-Si coatings during heat treatment

Visweswara Chakravarthy Gudla, Kristian Rechendorff, Zoltan Imre Balogh, Takeshi Kasama, Rajan Ambat

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The magnetron sputtered Al-Zr and Al-Zr-Si coatings were heat treated in-situ in a transmission electron microscope as well as ex-situ to observe their annealing behaviour and phase transformations. The samples were heated up to a temperature of 550°C and then cooled to room temperature. A layered structure with alternating layers of Al and Zr/Si rich Al was found for the as deposited sputter coatings. During in-situ heat treatment, the phases formed in the coatings were analysed using selective area electron diffraction and energy dispersive X-ray spectroscopy. For the Al-Zr sputtered coatings, metastable L12-Al3Zr nucleated initially by splitting of Zr rich Al layers followed by transformation to equilibrium DO23-Al3Zr. Addition of Si to the Al-Zr sputtered coating resulted in the formation of DO22-Al2.6Si0.4Zr phase instead of the DO23-Al3Zr phase. The lattice parameters and compositions of different phases formed are measured and presented.

    Original languageEnglish
    Pages (from-to)1071-1078
    Number of pages8
    JournalMaterials and Design
    Volume89
    DOIs
    Publication statusPublished - 5 Jan 2016

    Keywords

    • Al-Zr
    • Heating
    • In-situ TEM
    • Magnetron sputtering
    • Microstructural evolution
    • XRD

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