|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Aluminum Alloys, Processing and Characterization
||Microstructural Evolution after Single and Multi-pass Friction Stir Welding (FSW) of Wrought Mg-WE43 and Al-2024 Alloys
||Michael Frank, Saurabh Nene, Gaurav Argade, Rajiv Mishra, R.E. Brennan, K. Cho
|On-Site Speaker (Planned)
Single and multi-pass dissimilar friction stir welding was carried out on Mg-WE43 and Al-2024 alloys and microstructural evolution of the two specimens were compared. Characterization was performed using electron microscopy revealing thinner intermetallic compound layer (IMC) and enlarged mechanical interlocking feature. Multi-pass attributed to further mixing the nugget in the goal of homogenizing the complex flow-dictated intercalated region observed in single pass FSW. Further dispersion of Mg, Al, Rare earth containing IMCs in both the nugget and joint interface was observed in the multi-pass joint by energy dispersive spectroscopy. As a result of the multi-pass, IMC layer thicknesses in the joint reduced, nugget was more compositionally homogenized, and further grain refinement was observed. Overall the microstructural modifications by multi-pass friction stir welding in the nugget and joint interface have provided promising preliminary results. The microstructure-mechanical behavior correlations were established through lap shear testing of the joints and site-specific mini-tensile tests.
||Planned: Light Metals