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    Processing, Microstructure and Mechanical Properties of Multi-layer Friction Surfacing in 7075 Aluminium Alloy

    Access Status
    Fulltext not available
    Authors
    Matthieu, Jadot
    Li, Jishuai
    Gautier, Romain
    Lezaack, Matthieu Baudouin
    Sapanathan, Thaneshan
    Simar, Aude
    Date
    2024
    Type
    Conference Paper
    
    Metadata
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    Citation
    Matthieu, J. and Li, J. and Gautier, R. and Lezaack, M.B. and Sapanathan, T. and Simar, A. 2024. Processing, Microstructure and Mechanical Properties of Multi-layer Friction Surfacing in 7075 Aluminium Alloy. In: The Minerals, Metals & Materials Society - 153rd Annual Meeting & Exhibition, 3rd Mar 2024, Orlando, Florida USA.
    Source Conference
    The Minerals, Metals & Materials Society - 153rd Annual Meeting & Exhibition
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/94665
    Collection
    • Curtin Research Publications
    Abstract

    The solid-state AM process of Multi-Layer Friction Surfacing (MLFS) of high strength aluminium alloy 7075 leads to microstructure (grain size and precipitates size and distribution) and mechanical heterogeneities. The mean grain size at the bottom and top of a given layer is finer than at the middle of that layer. The strengthening precipitates are significantly affected by the layered structure due to the complex thermal field. These microstructural heterogeneities are affected by the thermal cycles experienced by the aluminium alloy 7075. The precipitates size gradient along the thickness of the deposit causes the significantly higher microhardness of the top layer. Post-deposition heat treatments are used to restore the uniformly T6 state microhardness. Although the part reveals some abnormal grain growth after the T6 heat treatment, tensile testing exhibits a strength above 500MPa and an elongation of typically 10%.

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