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Interlaminar Subgrain Refinement In Ultrasonic Consolidation, Kenneth E. Johnson

Faculty Scholarship – Engineering

This research presents microscopic evidence of dislocation propagation and sub-grain refinement in 3003-T0 aluminium undergoing high frequency fully reversed loading conditions during the Ultrasonic Consolidation process. Dual Beam Focused Ion Beam etching techniques and Transmission Electron Microscopy were used to characterize sub-grain morphology and dislocation structure in regions that were subjected to high levels of multi-axial ultrasonic micro-strain and resultant plastic deformation. This Deformation Affected Zone is characterized by regions of reduced sub-grain sizes that form a gradual transition into larger equiaxed, grains well below the interface.

While ultrasonic welding has been explored for some time, there has been little …