No abstract

His research focuses on the effectiveness of simulations, roleplays, and other high-involvement training across a variety of organizational and educational contexts. His educational training projects have included engineering, computer science, and law, as well as responsible conduct of research.

This work presents microsample measured mechanical properties of a friction stir welded (FSW) plate of Ti-5111. Property measurements and fractographic deformation observations were made as a function of discrete locations within the weld [stir zone (SZ), boundaries, base metal (BM)]. Properties in the longitudinal direction are compared to transverse measurements made at the same locations. Compared to the BM the longitudinal direction shows strength and ductility increases throughout the weld. The outer SZ showed mechanical properties in the longitudinal direction to be similar to the SZ properties in the transverse direction. These observations and measured properties serve to link the local material properties to the complex flow, heat, and deformation imparted to the material during the FSW process.

The microstructures of Al-Mg alloys with greater than 3wt.% Mg can sensitize leaving the material susceptible to intergranular corrosion (IGC); sensitized microstructures are identified by the amassing of phase precipitates at grain boundaries. Friction stir processing (FSP) has previously been shown to increase the corrosion resistance of sensitized Al-Mg alloys through break-up of the continuous network of phase particles [1]. In this study, multi-pass FSP is applied to a sensitized 5456-H116 aluminum plate and the resulting microstructure is linked to local mechanical properties (0.2% yield strength, ultimate tensile strength, and elongation) obtained using micro-tensile specimens extracted transversely across the FSP region. In the FSP region, the original sensitized microstructure becomes unsensitized; the unsensitized region is not limited to the friction stir zone but extends outward several mm into the base material. Though the sensitized microstructure is removed, the mechanical testing within the affected area shows the strength and elongation decrease and increase respectively from H116 temper to O temper levels. The previously sensitized microstructure is not observed to have negatively affected the mechanical properties