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Formation of interfacial microstructure in a friction stir welded lap joint between aluminium alloy and stainless steel |
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| Authors: | T. Nishida H. Nishida M. Fujimoto M. Takahashi A. Hirose |
| Affiliation: | 1. Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 575-0871, Japan;2. Kawasaki Heavy Industries Ltd, 3-1-1, Higashikawasaki-cho, Chuo-ku, Kobe, Hyogo 650-8670, Japan;3. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan |
| Abstract: | The interfacial microstructure produced through tool transit of a friction stir welded lap joint between an aluminium alloy and stainless steel was studied by transmission electron microscopy in order to clarify its early stages of formation. Transmission electron microscopy studies of the bottom surface of the exit hole revealed the presence of several mixed layers of an ultrafine intermetallic compound (IMC) and stainless steel. The joining between dissimilar materials was achieved through a continuous flow of the stirred aluminium alloy into the mixed layers and the resultant growth of the ultrafine IMCs due to the heat induced by the friction between the tool and the specimen. The continuous thin reaction layer finally produced at the interface was found to be stronger than the base aluminium alloy. |
| Keywords: | Aluminium alloy Stainless steel Dissimilar metal joint Friction stir welding Lap welding |