アルミニウム合金／鋼摩擦攪拌重ね合せ接合材の組織と接合強度に及ぼすプローブ先端位置の影響
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概要
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Lap joining of a 6022 aluminum alloy (Al) sheet and a low carbon steel, SPCC (Fe) sheet was performed using friction stir welding method (FSW) . The rotating tool with a probe was inserted into Al sheet which was overlapped on Fe sheet and traveled along its side edge. Two different probe tip positions were selected for welding: The tip was located at either 0.1 mm above (−0.1 mm) or 0.1 mm beneath (+0.1 mm) in reference to the Al/Fe interface. The probe tip was kept in Al matrix for the former case and it was inserted into Fe matrix for the other. In the present study, effects of probe tip position on interfacial microstructure, shear and peel strength were investigated and the relationship between fracture behavior and the interfacial microstructure was discussed. Lap joining was successively achieved both in "−0.1 mm" and "+0.1 mm" conditions. Both shear strength and peel strength were larger when the probe tip was inserted into Fe matrix. In the tensile test for the lap joint, rapid crack propagation took place along the joint interface in the former case and resulted in the reduced joint strength. On the other hand, for the latter case, in spite of a part of joint interface fractured in a brittle matter, the successive crack growth took place in Al matrix and the final fracture occurred in the parent material (Al) in a ductile manner. Grain refinement was achieved in the region close to the joint interface both in Al and Fe. Characteristic laminate structure was also observed in a part of the refined Fe grain structure.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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