Microstructure at friction stir lap joint interface of pure titanium and steel |
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Authors: | Jinsun Liao Naotsugu Yamamoto Kazuhiro Nakata |
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Affiliation: | a Kurimoto Ltd., 2-8-45 Suminoe, Osaka 559-0021, Japanb JWRI, Osaka University, 11-1 Mihogaoka Ibaraki, Osaka 567-0047, Japan |
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Abstract: | A commercially pure titanium plate was lap joined to a structural steel plate via friction stir welding, and the microstructures at the lap joint interface were intensively examined by means of electron backscatter diffraction analysis and transmission electron microscopy. Swirling-like macro- and micro-intermixing zones of titanium and steel are formed along the interface, where tiny Fe-Ti intermetallic particles are dispersed and mixed with β titanium in layers. The lap joint has high shear tensile strength, which is supposed to result from the dispersion of tiny Fe-Ti intermetallic particles and the formation of β titanium at the joint interface. |
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Keywords: | Friction stir welding Dissimilar lap joint Intermetallic compound Pure titanium Transmission electron microscopy |
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