25th annual James F. Bell Memorial Lecture in Continuum Mechanics

Description

The Department of Mechanical Engineering hosts the 25th Annual James F. Bell Memorial Lecture in Continuum Mechanics. Tresa M. Pollock, a professor in the Materials Department at University of California, Santa Barbara, delivers a talk titled "At the Crossroads of Additive Manufacturing, Analytics and Advanced Materials."

Presentation abstract:

Additive manufacturing promises new pathways for integration of advanced alloys with complex structural component design. Achieving desired properties mandates control of structure and an improved understanding of the processes that occur at the individual melt pool scale and their superposition as melting occurs on a layer- by-layer basis. A new technique developed at UCSB, TriBeam tomography, has been employed to acquire chemical, structural and misorientation information on structural alloys printed by electron beam and laser powder based processes. The data challenges with additive manufacturing and the corresponding 3D quantification of structure will be addressed. In large 3D datasets, the persistence of grains layer to layer due to remelting / nucleation has been studied as a function of scan strategy. The benefits of multimodal data for characterization of submicron features will be discussed. Finally, 3D EBSD data indicates that the accumulation of large crystallographic misorientations during printing is directly related to the alloy solidification path. Implications for alloy design and new alloys for printed structures are discussed.