转速对铝铜层状复合板搅拌摩擦焊接接头组织性能的影响

摘要

Al/Cu clad plates were joined by friction stir welding (FSW),and the effect of rotation rate on microstructure and mechani-cal properties of joints was investigated.The results show that the laminar structure of aluminum and copper is generated in the weld. With increase the of rotation rate,the grain sizes of aluminum and copper are increased respectively.The average microhardness of the Al/Cu plates exceeds that of the as-received metal of 33.0 HV,and ultimate tensile strength is 127.21 MPa in the nugget zone when rotation rate is 1180 r/min.The microhardness of copper in the nugget zone is 99.7 HV,reached 82.05% of the microhardness of re-ceived metal,and void defect is main reason responsible for the decrease of mechanical properties of joints.%采用搅拌摩擦焊接(FSW)对铝铜层状复合板进行焊接,研究转速对焊接接头组织性能的影响.结果表明:FSW接头在焊缝区域内铝铜金属呈层状分布;随着搅拌头转速的增大,焊核区(NZ)中铝与铜晶粒尺寸增大;转速为1180 r/min时,铝层焊缝中心区域平均显微硬度为33.0 HV,超过母材显微硬度,抗拉强度为127.21 MPa;转速为750 r/min时,铜层焊缝中心区域平均显微硬度为99.7 HV,达到母材显微硬度的82.05%;孔洞缺陷是造成接头力学性能较低的主要原因.