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Growth kinetics of Al-Fe intermetallic compounds during annealing treatment of friction stir lap welds
, Article Materials Characterization ; Vol. 90 , April , 2014 , pp. 121-126 ; ISSN: 10445803 ; Kokabi, A. H ; Seyed Reihani, S. M ; Najafi, H ; Farzadfar, S. A ; Cheng, W. J ; Wang, C. J ; Sharif University of Technology
Abstract
In this study, we explored the growth kinetics of the Al-Fe intermetallic (IM) layer at the joint interface of the St-12/Al-5083 friction stir lap welds during post-weld annealing treatment at 350, 400 and 450 C for 30 to 180 min. Optical microscope (OM), field emission gun scanning electron microscope (FEG-SEM) and transmission electron microscope (TEM) were employed to investigate the structure of the weld zone. The thickness and composition of the IM layers were evaluated using image analysis system and electron back-scatter diffraction (EBSD), respectively. Moreover, kernel average misorientation (KAM) analysis was performed to evaluate the level of stored energy in the as-welded state....