Mg-Al-Ca-Mn系合金の共材および異材SPR接合

抄録

In this study, non-combustible magnesium alloy (AX41, Mg-Al-Ca-Mn alloy) and AA6061 aluminum alloy were joined by SPR (self-piercing rivets). According to observation of bottom surface at joint region, it was confirmed that short crack occurred when AX41 was used as a lower sheet. The cracks were induced due to poor formability of AX41 magnesium alloys at room temperature. The strength of joint was evaluated by tensile shear test. In the similar material joint, the maximum shear load of a AX41/AX41 joint was lower than that of AA6061/AA6061 joint. In case of the dissimilar materials joint, a joint showed higher maximum tensile shear load when AA6061 was used as a lower sheet. During the tensile shear test, crack occurred in the bottom of the lower sheet when AX41 was used as a lower sheet, and this crack affected the maximum load by causing pull out of a rivet from a lower sheet.