CNTs增强镁基复合材料搅拌摩擦焊工艺研究

Research on Friction Stir Welding Process of Magnesium Matrix Composite Enhanced with CNTs

利用搅拌摩擦焊接(FSW)技术焊接了CNTs/AZ91镁基复合材料,研究了工艺参数对CNTs/AZ91复合材料FSW接头组织与性能的影响。结果表明:采用FSW技术对CNTs/AZ91复合材料进行焊接可以获得表面成形和力学性能较好的对接接头。当搅拌头旋转速度为700 r/min时,焊缝中CNTs分布均匀,接头强度和塑性最好,改变搅拌头旋转速度,均会降低接头强度和塑性。

CNTs/AZ91 composite was welded by friction stir welding. The influences of process parameters on the microstructure and properties of welded joint were studied. The results show that： FSW technology for CNTs/AZ91 composite can get the butt joint with better surface forming and excellent mechanical properties. Under the parameter of rotating speed of 700r/min,the microstructure of weld nugget distributes homogeneously, the phenomenon of CNTs agglomeration on the weld reduces significantly, but there are some CNTs agglomerate in the heat affected zone.