|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Friction Stir Welding and Processing IX
||Intermetallic Phase Formation at Al-steel Solid-state Joints – A Comparison between FSW and VFAW Processes
||Genevieve Lee, Kaleb Ponder, Ali Nassiri, Bert Liu, Glenn Daehn, Antonio J Ramirez
|On-Site Speaker (Planned)
In the pursuit of manufacturing lighter, more efficient vehicles, formation of brittle intermetallic compounds along Al-alloys to steel joint interfaces has proved a remarkable challenge, precluding its widespread use in the automotive industry. Intermetallic phases form rapidly along the Al-Fe interfaces, compromising the mechanical performance of these joints. Friction Stir Welding (FSW) parameters can be optimized for Al-steel joints, producing welds with minimal fractions or elimination of intermetallics. Alternatively, recently developed Vapor Foil Actuator Welding (VFAW)––which impacts an aluminum flyer plate onto a steel substrate––creates metallurgical bonding within microseconds. However, intermetallics are observed even on near-instantaneous welds. Dissimilar Al-steel FSW and VFAW joints have been extensively studied by Scanning Electron Microscopy (SEM) imaging, Transmission Kikuchi Diffraction (TKD) and Energy Dispersive X-ray Spectroscopy (XEDS) to clarify fundamental differences and further optimize both processes. The high-energy low-weld-time VFAW technique produces intermetallics along interfaces, while low-temperature long-weld-time FSW exhibits no observable intermetallics.
||Planned: Stand-alone book in which only your symposium’s papers would appear (indicate title in comments section below)