|About this Abstract
||Materials Science & Technology 2012
||In-situ Characterization of Phase Transformations in Materials
||Microstructural Evolution Characterization in Friction Stir Welds
||Richard Fonda, Keith E Knipling, Adam L Pilchak
|On-Site Speaker (Planned)
Friction stir welding is a solid-state joining process developed in 1991 that has become a commercially-important joining process for aluminum alloys. This process produces large thermal and deformation gradients, generating interesting microstructures within the weld-affected regions. For alloys such as ferritic steels and many titanium alloys, those microstructures are further complicated by the allotropic phase transformations they undergo during welding. This talk will focus on techniques used to discern the in-situ evolutionary processes that occur during friction stir welding, although a direct in-situ analysis of those processes cannot be achieved at this time. We will focus on techniques such as intelligent sectioning, texture evolution analyses, and prior-beta grain reconstructions to reveal how the base plate evolves into the thermo-mechanically affected zone and then into the stir zone during the friction stir welding process.