Prediction of hardness minimum locations during natural aging in an aluminum alloy 6061-T6 friction stir weld

W Woo, H Choo, P J Withers, Z Feng

    Research output: Contribution to journalArticlepeer-review

    Abstract

    This study describes a method that can predict the hardness minimum location as a function of natural aging time in a heat-treatable 6061-T6 Al alloy plate subjected to friction stir welding (FSW). First, temperature distributions were simulated in the FSW plate by finite element modeling. Second, to determine the natural aging kinetics, hardness changes were measured as a function of natural aging time from a number of Al specimens that had been isothermally heat treated at different peak temperatures. Finally, the simulated temperature profiles and the natural aging kinetics were correlated to predict the hardness profiles in the FSW plate. The predicted hardness minimum locations are consistent with the measured hardness profiles in that the hardness moves away from the weld centerline as the aging time increases. Moreover, the predicted hardness minimum is located at the similar position of failure in cross-weld tensile samples.
    Original languageEnglish
    Pages (from-to)6302-6309
    Number of pages8
    JournalJournal of Materials Science
    Volume44
    Issue number23
    DOIs
    Publication statusPublished - 2009

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