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Recently, joining dissimilar materials, including steel, CFRP, and aluminum alloy, has been successfully studied due to multiple materials used in the structure of automobiles. However, such multiple-material products will be a problem for recycling. Joining the materials more tightly and wholly makes it more difficult to separate them in the recycling procedure. Therefore, it is worthwhile to discuss methods for easily decomposable joined dissimilar materials. Figure 1 depicts the schema of friction-stir forming (Nishihara et.al., 2002, 2003). In the process, material is put on the die, and friction stirring is conducted on its back surface to transfer the shape of the die to it. Friction-stir processing was originally invented by TWI in the UK (Thomas 2001). Friction stirring has begun to be applied for material forming as well as the friction-stir forming, i.e., for incremental forming, by Otsu et al. (2014) and Matsumoto et al. (2015) and for boss generation on a plate by Yukutake et.al.(2012). The authors studied fastenerless riveting, in which process a rivet-like structure is generated by the friction-stir forming with utilizing a die to join steel and aluminum alloy plate, and CFRP and aluminum alloy plate (Fig. 2)(Ohashi et.al, 2016, 2017a). In this paper, the authors propose a concept to easily separate joined dissimilar materials employing

Mechanical behavior and fracture of easily-decomposable dissimilar-materials-joint fabricated by friction stir forming