金属薄板のメカノメタラジカル接合法の開発と接合機構の解明

抄録

The use of ultrasonic vibrations to join dissimilar metal plates was investigated. Plastic flow appeared when joining two aluminum plates by applying a zero-amplitude ultrasonic wave (stress amplitude is maximum). Over time, the plastic flow increased and resulted in a stirring phenomenon of the materials. Electron backscattering diffraction analysis revealed that ultrasonic-vibration-induced recrystallization occurred on the shear band. We call the joining method the mechanometallurgical joining method. By this joining method, an aluminum plate was joined to a steel plate. The resultant plate was analyzed by the cross-tension test and cross-sectional observation. When joining an aluminum plate to various kinds of metal plates, the cross-tensile load of the joint reached a maximum value of 200 N. The cross-tension tests revealed that fracture of the materials resulted in the plug failure mode. Therefore, the strength of bonding was greater than the tensile strength of the aluminum plate. These results led us to the conclusion that the joining of dissimilar metal plates has been achieved using ultrasonic vibrations.