Collaborative Research and Development (CR&D). Delivery Order 0002: Deformation Mechanisms During Hot Working of Titanium

摘要

This research in support of the Air Force Research Laboratory Materials and Manufacturing Directorate was conducted at Wright-Patterson AFB, Ohio from 2 May 03 through 30 Oct 05. The research examined the stress-strain responses for individual a/B colonies of Ti-6A 1-4V established via uniaxial compression testing at 8l5 deg C for crystals oriented for single slip along specific slip systems. Some samples were designed to enforce the highest Schmidt factor on (a, a, and a) slip on either basal or prism planes. Others were loaded parallel to the c-axis to activate pyramidal slip in the a-phase. The high-temperature stress-strain response showed lower yield strength (soft prism) compared to slip along a (hard prism). Similar anisotropy was observed for basal slip. However, the flow stress for all basal slip systems were always higher than prismatic slip. This anisotropy is a result of the orientation relationship between the a and B phases and the associated misalignment of slip directions in both phases.