《Table 2 Tensile properties of the joints at various tool rota-tion speeds》

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《搅拌头偏移对Ti/Al异种金属搅拌摩擦焊接头成形及拉伸强度的影响（英文）》

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The fraction location of the joint at various tool rotation speeds is different in the tensile test，despite the surfaces of the four rotation speeds are all good and have no defects.There are three kinds of fraction locations as a whole listed in Table 2，such as nugget zone，interface between TC4 and nugget，heat affected zone（HAZ）of Al base metal.The tensile strength is low when the tensile sample is fractured in the nugget zone and the tensile strength is high when the tensile sample is fractured in the HAZ of Al base metal.The tensile strength is between the two when the tensile sample is fractured in the interface between TC4 and nugget.