An investigation on the fatigue behaviour of Al 7075-T6 coated with titanium nitride using physical vapour deposition process

Reza Oskouei, Raafat Ibrahim

    Research output: Contribution to journalArticle

    20 Citations (Scopus)

    Abstract

    This paper investigates the fatigue behaviour of aluminium alloy 7075-T6 coated with 3-μm-thick titanium nitride (TiN) coatings using a physical vapour deposition (PVD) process. Preliminary work demonstrated that the high operating temperature of the deposition process markedly reduced the tensile properties of the coating-substrate system by comparison to the uncoated Al 7075-T6. The low tensile properties of the coated material caused a considerable reduction in the load-carrying capacity under fatigue loading. Consequently, a substantial decrease of 90% was found in the fatigue life of the coated material. The lost tensile properties were then satisfactorily recovered by applying a post heat treatment to the coated alloy leading to significant fatigue life improvements to approach original properties of the uncoated Al 7075-T6. The evaluation of fatigue fracture surfaces at high magnifications indicated that the fatigue cracks initiated at the outer surface of the aluminium substrate under the coating thin layer.

    Original languageEnglish
    Pages (from-to)294-302
    Number of pages9
    JournalMaterials and Design
    Volume39
    DOIs
    Publication statusPublished - Aug 2012

    Keywords

    • A. Non-ferros metals and alloys
    • B. Film and sheet
    • E. Fatigue

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