MICROSTRUCTURAL CHARACTERISTICS OF TRANSITION ZONE IN Al-BASED COMPOSITE/STAINLESS STEEL FRICTION JOINT
铝基复合材料—不锈钢摩擦焊接过渡区的显微结构特征

The microstructural variations of the transition zone in the friction joints of Al-base composite with austenitic stainless steel were studied systematically. The scanning electron microscopy (SEM) observations found that the plastic deformation can be obviously caused in the side of the high strength stainless steel during the friction welding. The deformation characteristics and mechanism are different in the different parts along the weld interface. Transmission electron microscopy (TEM) observations found that the transition zone is composed of a micro-crystalline oxide Fe(Al,Cr)2O4 or FeO·(Al,Cr)2O3 layer and a FeAl3 intermetallic layer. Correspondent: PAN Chunxu,(associate professor, Laboratory of Electron Microscopy, Wuhan Transportation University, Wuhan 430063)