Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 496, Issue 1-2, Pages 77-89Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.06.033
Keywords
Friction stir welding; Differential scanning calorimetry (DSC); Transmission electron microscopy (TEM); Aluminium alloys; Precipitation; Hardening
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The effect of friction stir welding on the microstructure and local properties of the AA6056 alloy has been investigated for both T4 and T78 initial states. A particular attention was devoted to the relationship between the fine hardening precipitation within the affected zones and local hardness. In the heat-affected zones of the T4 weld an extensive heterogeneous precipitation is occurring on dislocations and dispersoids whereas the heat-affected zones of the T78 weld are characterised by the coarsening and dissolution of initial hardening precipitates and by heterogeneous precipitation on dispersoids. Modelling tools dedicated to the weld behaviour understanding have been developed: a physically based model for precipitation and hardening has been coupled to a model for thermal cycles. This model describes correctly both the microstructural evolution through the FSW joint and its consequence on hardness variations. (C) 2008 Elsevier B.V. All rights reserved.
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