Prediction of hardness minimum locations during natural aging in an aluminum alloy 6061-T6 friction stir weld |
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| Authors: | W Woo H Choo P J Withers Z Feng |
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| Affiliation: | (1) Neutron Science Division, Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu, Daejeon, 305-353, South Korea;(2) Department of Materials Science and Engineering, The University of Tennessee, Knoxville, TN 37996, USA;(3) Manchester Materials Science Center, University of Manchester, Grosvenor St., Manchester, M1 7HS, UK;(4) Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA |
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| 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. |
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