Restoring the tensile properties of PVD-TiN coated Al 7075-T6 using a post heat treatment

Reza Oskouei, Raafat Ibrahim

    Research output: Contribution to journalArticle

    17 Citations (Scopus)

    Abstract

    In this work, a post heat treatment cycle is proposed with the aim to recover the lost tensile properties of aluminium alloy 7075-T6 coated with a 3 μm thick titanium nitride (TiN) film by using a physical vapour deposition (PVD) process. First, it was found that the application of the PVD hot process with a high operating temperature of 450°C significantly decreased the tensile properties of the coating-substrate system compared to those of Al 7075-T6. The yield and ultimate strength decreased by 78% and 54%, respectively. However, as a result of re-applying the T6 cycle (as the post heat treatment), substantial improvements of 243% and 77% were achieved in the yield and ultimate strength of the coated material, respectively. Fractography of the failed specimens indicated the TiN coating layer to be satisfactorily adhered to the substrate under tensile loading.

    Original languageEnglish
    Pages (from-to)3967-3973
    Number of pages7
    JournalSurface and Coatings Technology
    Volume205
    Issue number15
    DOIs
    Publication statusPublished - 2011

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