Machining introduced microstructure modification in aluminium alloys

Bing Liu, Xiaorong Zhou, Teruo Hashimoto, Xinxin Zhang, Junjie Wang

    Research output: Contribution to journalArticlepeer-review

    Abstract

    In the present study, the impact of machining on the microstructure of AA7150-T651 aluminium alloy is investigated. It is found that a near-surface deformed layer is formed on the alloy due to severe shear strain during machining operation. The near-surface deformed layer of approximately 500 nm thickness distributes uniformly across the machined alloy surface. Ultrafine equiaxed grains with the dimensions of 50-100 nm are formed within the near-surface deformed layer. Further, the strengthening precipitates (MgZn2) that are initially present in the alloy in T651 temper are dissolved into the alloy matrix within the near-surface region. Subsequently, the dissolved alloying elements segregate at the grain boundaries of the newly formed fine grains in the near-surface deformed layer.
    Original languageEnglish
    JournalJournal of Alloys and Compounds
    Volume757
    Early online date9 May 2018
    DOIs
    Publication statusPublished - 15 Aug 2018

    Keywords

    • Aluminium alloy
    • machining
    • Grain refinement

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