Location and Orientation Specific Material Property Evaluation of Friction Stir Welded Ti-5111: A Microsample Approach

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. Microsamples (shown in figure) are extracted from a friction stir welded plate of Ti‐5111 and mechanically tested to failure. Samples are oriented in the longitudinal to the weld direction and compared to previous work that characterized the weld in the transverse direction.