Natural aging in friction stir welded 7136-T76 aluminum alloy |
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| Affiliation: | 1. Faculty of Metal Engineering and Industrial Computer Science, AGH University of Science and Technology, Av. Mickiewicza 30, 30-059 Krakow, Poland;2. Department of Mechanical and Manufacturing Engineering, Miami University, School of Engineering and Applied Science, Oxford, OH, USA;1. Centre for Advanced Materials, Qatar University, Doha, Qatar;2. Materials Science and Technology Program, Qatar University, Doha, Qatar;1. School of Metallurgy and Materials Engineering, Iran University of Science and Technology (IUST), Tehran, Iran;2. Department of Biomechanical Engineering, Delft University of Technology, Mekelweg 2, 2628 CD Delft, The Netherlands;1. Lehrstuhl Werkstofftechnik, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany;2. BIAS – Bremer Institut für angewandte Strahltechnik GmbH, Klagenfurter Str. 2, 28359 Bremen, Germany |
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| Abstract: | The long term natural aging behavior of friction stir welded aluminum 7136-T76 extrusions was investigated. The microstructural characteristics and mechanical properties in the as-welded, three years naturally aged and six years naturally aged conditions were studied and correlated to a coupled thermal/material flow model of the joining process. Hardness profiles taken along the mid-plane thickness of the workpiece displayed the characteristic W-shape typical to friction stir welded aluminum alloys. In the as-welded condition, however, the profile was skewed to the advancing side, such that the advancing side hardness was lower than that on the retreating side. With natural aging, hardness recovery occurred on both sides of the weld, but the position of the hardness minima, particularly on the advancing side, shifted away from the weld centerline. The numerical simulation demonstrated that the temperature profile is also skewed to the advancing side with greater processing temperatures occurring on this side of the weld. When compared to the dissolution temperature of the equilibrium phases, the extent of dissolution was greater on the advancing side and occurred to a greater distance from the centerline than on the retreating side. The hardness behavior upon natural aging, therefore, correlated to the temperature profile developed during welding and the degree to which phase dissolution occurred in the regions adjacent to the stir zone. |
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| Keywords: | Friction stir welding Natural aging Aluminum alloys Thermal model |
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